Free Apps and Tools No Catch, No Subscription

Data & Calculators: Functions & Curves

2 apps

Parametric Curve Plotter

Turn two formulas into loops, spirals, Lissajous figures, and other paths controlled by t.

Scientific Function Plotter

Type a math formula and explore its curve with zoom, hover values, and a clean downloadable graph.

Data & Calculators: Compare Data

4 apps

Bubble Chart Maker

Compare x, y, and size at once, with labels and groups that make every bubble easy to inspect.

CSV Scatter Plot Maker

Paste x and y values, colour points by group, and spot clusters, gaps, and unusual results.

Error Bar Chart Maker

Plot measured values with plus-or-minus error bars so uncertainty stays visible beside each result.

Multi-Series Line Chart Maker

Draw one or more ordered lines from CSV data and compare how each series rises or falls.

Data & Calculators: Distributions

3 apps

Box Plot Maker

Compare medians, quartiles, ranges, and unusual points across one or more groups.

Histogram Maker

Group measurements into bins and see where values gather, spread out, or form more than one peak.

Violin Plot Maker

Show the full density shape of grouped measurements while keeping the median and inner box visible.

Data & Calculators: Grids & Fields

3 apps

2D Density Contour Plot Maker

Estimate where x and y observations gather and show their density as filled contour bands.

Contour Plot Maker

Turn gridded measurements into smooth contour bands that reveal peaks, valleys, and boundaries.

Matrix Heatmap Maker

Convert row, column, and value data into a colour grid with hover values and a clear scale.

Data & Calculators: 3D Science

3 apps

3D Scatter Plot Maker

Plot x, y, and z values in a rotatable space, then colour groups and inspect point labels.

3D Surface Function Plotter

Type a two-variable formula and rotate a smooth 3D surface to inspect peaks, bowls, waves, and saddles.

3D Vector Field Maker

Draw vectors from x, y, z positions with u, v, w direction values in a rotatable cone field.

Data & Calculators: Special Coordinates

3 apps

Polar Plot Maker

Turn angle and radius values into circular traces for direction, cycles, and radial measurements.

Radar Chart Maker

Compare several profiles across the same named categories with clear filled radar shapes.

Ternary Plot Maker

Plot three values that form a whole, such as material blends, soil mixes, or survey shares.

Data & Calculators: Finance & Change

2 apps

Candlestick Chart Maker

Turn dated OHLC values into an interactive candlestick chart with zoom and a range slider.

Waterfall Chart Maker

Show how gains, losses, and totals move a starting value toward a final result.

Data & Calculators: Many Variables

3 apps

Correlation Matrix Heatmap

Calculate pair-by-pair correlations across numeric columns and see strong positive or negative links.

Parallel Coordinates Plot Maker

Turn each numeric column into an axis and follow every row across a high-dimensional profile.

Scatter Plot Matrix Maker

Build a grid of scatter plots so every numeric column can be compared with every other column.

Data & Calculators: Math Calculators

44 apps

Area Calculator

Calculate area and perimeter for rectangles, circles, triangles, trapezoids, and ellipses.

Average Calculator

Calculate arithmetic mean, median, sum, count, minimum, and maximum for a list of numbers.

Basic Calculator

Evaluate arithmetic with parentheses, powers, percentages, and standard operator precedence.

Big Number Calculator

Perform exact arithmetic on integers larger than JavaScript's ordinary safe-number range.

Binary Calculator

Perform exact arithmetic on binary integers and convert the result to decimal and hexadecimal.

Circle Calculator

Find diameter, circumference, area, and equations from a circle radius.

Common Factor Calculator

List all positive factors shared by two or more whole numbers.

Confidence Interval Calculator

Estimate a normal-theory confidence interval for a mean from a sample mean, deviation, and size.

Distance Calculator

Calculate straight-line distance, displacement, midpoint, and coordinate differences between two points.

Exponent Calculator

Raise any real base to an integer or fractional exponent and show reciprocal forms for negative powers.

Factor Calculator

List every positive factor and factor pair for a whole number.

Fraction Calculator

Add, subtract, multiply, or divide two fractions and reduce the answer to lowest terms.

Greatest Common Factor Calculator

Find the greatest common factor of two or more whole numbers.

Half-Life Calculator

Calculate the remaining amount, elapsed half-lives, and decay constant for exponential decay.

Hex Calculator

Perform exact arithmetic on hexadecimal integers and convert the result to decimal and binary.

Least Common Multiple Calculator

Find the least common multiple of two or more whole numbers.

Log Calculator

Calculate logarithms with any positive base, including common and natural logarithms.

Long Division Calculator

Divide whole numbers and show quotient, remainder, decimal result, and the division identity.

Matrix Calculator

Add, subtract, multiply, transpose, or find the determinant of matrices up to 8 by 8.

Mean, Median, Mode, Range Calculator

Find the mean, median, mode, range, sum, and count of a list of numbers.

Number Sequence Calculator

Analyze a sequence for arithmetic or geometric patterns and project its next five terms.

P-value Calculator

Convert a z statistic to left-tailed, right-tailed, and two-tailed normal-distribution p-values.

Percent Error Calculator

Compare an observed value with an accepted value and calculate absolute and signed percent error.

Percentage Calculator

Solve percent-of, percent-ratio, and percentage-change questions with the formula shown.

Permutation and Combination Calculator

Calculate ordered permutations and unordered combinations for n objects chosen r at a time.

Prime Factorization Calculator

Break a whole number into prime factors and show exponential notation.

Probability Calculator

Calculate event probability, odds, complements, and independent two-event combinations.

Pythagorean Theorem Calculator

Find the hypotenuse and other properties of a right triangle from its two legs.

Quadratic Formula Calculator

Solve ax² + bx + c = 0 and report real or complex roots, the discriminant, and vertex.

Random Number Range Generator

Generate one or more random integers or decimals within an inclusive range.

Ratio Calculator

Simplify a ratio, convert it to fractions and percentages, and scale it to a chosen total.

Right Triangle Calculator

Solve all sides, acute angles, area, and perimeter from two right-triangle legs.

Root Calculator

Calculate square, cube, or nth roots, including real odd roots of negative numbers.

Rounding Calculator

Round a number to decimal places or significant figures and compare floor, ceiling, and truncation.

Sample Size Calculator

Estimate a survey sample size from confidence level, margin of error, population, and expected proportion.

Scientific Calculator

Evaluate scientific expressions with powers, roots, trigonometry, logarithms, constants, and factorials.

Scientific Notation Calculator

Convert decimal numbers to normalized scientific and engineering notation.

Slope Calculator

Find slope, distance, midpoint, line equation, and angle from two Cartesian points.

Standard Deviation Calculator

Calculate population and sample standard deviation, variance, mean, and count for a data set.

Statistics Calculator

Summarize a data set with centre, spread, variance, standard deviation, and sorted values.

Surface Area Calculator

Calculate total and lateral surface area for common solid shapes.

Triangle Calculator

Solve a triangle from three side lengths, including area, perimeter, angles, and classification.

Volume Calculator

Find the volume and surface area of common three-dimensional shapes.

Z-score Calculator

Standardize a value using a population mean and standard deviation, then estimate its percentile.

Data & Calculators: Financial Calculators

75 apps

401K Calculator

Project employee and employer retirement contributions with annual growth and current-plan limits entered as assumptions.

Amortization Calculator

Calculate an amortizing payment, first-month principal and interest, total interest, and payoff time.

Annuity Calculator

Calculate the future value of regular deposits with optional starting principal and compound return.

Annuity Payout Calculator

Estimate a level monthly payout from an annuity balance, interest rate, and payout term.

APR Calculator

Estimate annual percentage rate from amount received, monthly payment, term, and prepaid finance charges.

Auto Lease Calculator

Estimate a vehicle lease payment from capitalized cost, residual, money factor, term, tax, and upfront reductions.

Auto Loan Calculator

Estimate vehicle financing from purchase price, trade-in, down payment, sales tax, fees, and loan terms.

Average Return Calculator

Calculate arithmetic average, compounded annual growth rate, and cumulative return from periodic percentages.

Boat Loan Calculator

Estimate payment and total interest for a fixed-rate boat or marine loan.

Bond Calculator

Calculate a fixed-coupon bond price and current yield from face value, coupon, market yield, maturity, and payment frequency.

Budget Calculator

Summarize monthly income, needs, wants, savings, and remaining cash with a 50/30/20 comparison.

Business Loan Calculator

Estimate business-loan payment, borrowing cost, fees, and payoff with optional extra principal.

Canadian Mortgage Calculator

Estimate a Canadian mortgage payment using nominal annual interest compounded semi-annually and monthly payments.

Cash Back or Low Interest Calculator

Compare vehicle cash-back financing with a standard rate against a lower-rate offer without the rebate.

CD Calculator

Project a certificate-of-deposit balance from deposit, APY, term, and tax-rate assumptions.

College Cost Calculator

Project future college costs from current annual cost, inflation, years until enrolment, and program length.

Commission Calculator

Calculate tiered or flat commission, base pay, total compensation, and effective commission rate.

Compound Interest Calculator

Compare equivalent nominal interest rates across annual, monthly, daily, continuous, and other compounding periods.

Credit Card Calculator

Estimate credit-card payoff time and interest from balance, APR, monthly payment, and extra payment.

Credit Cards Payoff Calculator

Estimate avalanche payoff for multiple cards while preserving the entered total monthly payment.

Currency Calculator

Convert an amount with an explicit market or card exchange rate and optional foreign-exchange fee.

Debt Consolidation Calculator

Compare current weighted debt cost with a proposed consolidation loan after origination fees.

Debt Payoff Calculator

Compare payoff time and interest with and without an extra monthly debt payment.

Debt-to-Income Ratio Calculator

Calculate front-end and back-end monthly debt-to-income ratios from gross income and required payments.

Depreciation Calculator

Calculate straight-line, declining-balance, or sum-of-years-digits depreciation and book value for a selected year.

Discount Calculator

Calculate sale price, amount saved, and combined successive discounts.

Down Payment Calculator

Calculate down payment, mortgage amount, loan-to-value ratio, and months needed to reach a savings goal.

Estate Tax Calculator

Estimate 2026 U.S. federal estate tax above the entered exclusion after debts, expenses, and charitable transfers.

FHA Loan Calculator

Estimate an FHA-style mortgage payment with entered upfront and annual mortgage-insurance assumptions.

Finance Calculator

Calculate future value from present value, monthly cash flow, interest rate, and number of periods.

Future Value Calculator

Compound a present lump sum to a future value using an annual return and time horizon.

HELOC Calculator

Estimate interest-only draw-period and amortizing repayment-period payments for a home-equity line of credit.

Home Equity Loan Calculator

Calculate payments and interest for a lump-sum home-equity loan.

House Affordability Calculator

Estimate an affordable purchase price from income, debts, down payment, interest rate, and housing-cost assumptions.

Income Tax Calculator

Estimate 2026 U.S. federal ordinary income tax from filing status, gross income, and deductions.

Inflation Calculator

Project future prices and purchasing power from an amount, annual inflation rate, and time.

Interest Calculator

Calculate compound growth with a starting balance, recurring monthly deposits, annual rate, and time.

Interest Rate Calculator

Estimate the annual rate implied by a loan amount, monthly payment, and term.

Investment Calculator

Project an investment account with an initial balance, monthly deposits, annual return, and time.

IRA Calculator

Project traditional IRA growth and compare an illustrative taxable withdrawal after a retirement tax rate.

IRR Calculator

Calculate periodic internal rate of return and net present value from a series of cash flows.

Lease Calculator

Estimate a level lease payment from asset value, residual, annual lease rate, and term.

Loan Calculator

Calculate fixed-rate loan payments, interest, total cost, and accelerated payoff with extra payments.

Margin Calculator

Calculate gross profit, margin, and markup from cost and selling price.

Marriage Tax Calculator

Compare 2026 U.S. federal ordinary-income tax when two incomes are filed separately as single versus jointly.

Mortgage Amortization Calculator

Calculate mortgage payment, total interest, first payment split, and accelerated payoff.

Mortgage Calculator

Estimate principal-and-interest payment plus property tax, insurance, association dues, and down payment.

Mortgage Calculator UK

Estimate a UK repayment mortgage payment, total interest, deposit, and loan-to-value ratio.

Mortgage Payoff Calculator

Estimate mortgage payoff time, total interest, and savings from an extra monthly payment.

Mutual Fund Calculator

Project investment growth after an annual expense ratio and optional front-end sales load.

Payback Period Calculator

Calculate simple and discounted payback time from an initial investment and recurring cash inflow.

Payment Calculator

Estimate the periodic payment and total cost for a fixed-rate installment balance.

Pension Calculator

Estimate a level monthly pension from an account balance, payout return, and payout period.

Percent Off Calculator

Calculate sale price, savings, and tax after a percentage discount.

Personal Loan Calculator

Compare the payment and all-in cost of an unsecured personal loan.

Present Value Calculator

Discount a future lump sum to present value using an annual rate and time horizon.

Real Estate Calculator

Estimate property cash flow, capitalization rate, cash-on-cash return, and simple net operating income.

Refinance Calculator

Compare an existing mortgage with a proposed refinance, including closing costs and break-even month.

Rent Calculator

Estimate a monthly rent budget from income, existing debt, utilities, savings goal, and a chosen rent-to-income guideline.

Rent vs. Buy Calculator

Compare simplified multi-year net cost of renting with homeownership after equity and selling costs.

Rental Property Calculator

Estimate rental-property net operating income, cash flow, cap rate, and cash-on-cash return.

Repayment Calculator

Estimate how long a fixed payment takes to repay a balance and how extra payments change the cost.

Retirement Calculator

Project retirement savings, inflation-adjusted value, and a planning withdrawal from current savings and contributions.

RMD Calculator

Estimate a required minimum distribution from prior year-end balance and an entered Uniform Lifetime Table age.

ROI Calculator

Calculate return on investment, net profit, annualized return, and profit multiple.

Roth IRA Calculator

Project tax-free Roth IRA account growth from current savings, monthly contributions, return, and time.

Salary Calculator

Convert hourly, daily, weekly, biweekly, semi-monthly, monthly, quarterly, and annual pay with holiday and vacation adjustments.

Sales Tax Calculator

Add or extract sales tax from a price and show the tax amount and before-tax subtotal.

Savings Calculator

Project savings growth from a current balance, monthly deposits, rate, and time.

Simple Interest Calculator

Calculate simple interest, ending balance, and effective total return without compounding.

Social Security Calculator

Compare a Social Security retirement benefit estimate at claiming ages 62 through 70 from the benefit quoted at full retirement age.

Student Loan Calculator

Estimate student-loan payments, interest, fees, and the effect of voluntary extra payments.

Take-Home-Paycheck Calculator

Estimate annual and per-pay take-home from salary, pre-tax deductions, 2026 federal tax, payroll tax, and a state-rate input.

VA Mortgage Calculator

Estimate a VA-style mortgage payment with entered down payment, funding fee, taxes, and insurance.

VAT Calculator

Add or extract value-added tax from a price and show net, tax, and gross amounts.

Data & Calculators: Fitness & Health Calculators

31 apps

Army Body Fat Calculator

Estimate circumference-based body-fat percentage using the established neck, waist, hip, and height equations.

BAC Calculator

Estimate blood alcohol concentration from standard-drink alcohol mass, body weight, sex coefficient, and elapsed time.

BMI Calculator

Calculate adult body mass index, CDC weight category, and the weight range corresponding to BMI 18.5 through 24.9.

BMR Calculator

Estimate basal metabolic rate and maintenance energy with the Mifflin-St Jeor equation.

Body Fat Calculator

Estimate body-fat percentage with the circumference-based U.S. Navy method and calculate fat and lean mass.

Body Surface Area Calculator

Estimate body surface area with the Mosteller, Du Bois, and Haycock equations.

Body Type Calculator

Compare bust, waist, and hip proportions to describe a geometric body-shape pattern and waist-to-hip ratio.

Calorie Calculator

Estimate daily calories to maintain, lose, or gain weight from the Mifflin-St Jeor resting-energy equation.

Calories Burned Calculator

Estimate exercise energy expenditure from activity MET value, body weight, and duration.

Carbohydrate Calculator

Estimate calorie targets and daily carbohydrate allowances for weight maintenance, loss, and gain from age, sex, height, weight, and activity.

Conception Calculator

Estimate likely conception and fertile-window dates from a period date, due date, or known birth date.

Due Date Calculator

Estimate a pregnancy due date from last menstrual period, conception, or embryo-transfer date.

Fat Intake Calculator

Estimate calorie targets, total fat range, and saturated-fat limits for weight maintenance, loss, and gain.

Food Points Estimate Calculator

Estimate the December 2015 to November 2021 food points value from calories, sugar, saturated fat, and protein.

GFR Calculator

Estimate adult glomerular filtration rate with the race-free 2021 CKD-EPI creatinine equation.

Healthy Weight Calculator

Calculate the adult weight interval corresponding to BMI 18.5 through 24.9 for a given height.

Ideal Weight Calculator

Compare four commonly cited height-based reference-weight formulas and the adult healthy-BMI range.

Lean Body Mass Calculator

Compare Boer, Hume, and James lean-body-mass estimates from height, weight, and sex.

Low BMI Threshold Calculator

Calculate current BMI and reference weights for BMI 18.5 and the historically cited 17.5 threshold.

Macro Calculator

Estimate daily protein, carbohydrate, and fat targets from energy needs, goal, and a chosen macro split.

One Rep Max Calculator

Estimate one-repetition maximum and training loads from weight lifted and completed repetitions.

Overweight Calculator

Compare current weight with adult BMI 25 and 30 reference thresholds for the same height.

Ovulation Calculator

Estimate ovulation date, fertile window, and next period from the last period and typical cycle length.

Pace Calculator

Calculate running pace, speed, and projected finish times from distance and elapsed time.

Period Calculator

Project upcoming period and ovulation dates from a typical cycle and period length.

Pregnancy Calculator

Estimate due date, conception window, trimester dates, and current gestational age from the last menstrual period.

Pregnancy Conception Calculator

Estimate conception and fertile-window dates from a due date or last menstrual period.

Pregnancy Weight Gain Calculator

Compare current pregnancy weight gain with Institute of Medicine reference ranges based on pre-pregnancy BMI.

Protein Calculator

Estimate daily protein recommendations from body weight and calorie needs using ADA, CDC, and WHO reference methods.

Target Heart Rate Calculator

Estimate maximum heart rate and training zones with both percent-maximum and Karvonen heart-rate-reserve methods.

TDEE Calculator

Estimate total daily energy expenditure from resting energy and an activity multiplier.

Data & Calculators: Other Calculators

52 apps

Bandwidth Calculator

Estimate file-transfer time from file size, link speed, and protocol efficiency.

Base64 Encode / Decode

Encode UTF-8 text as Base64 or decode Base64 back to readable UTF-8, entirely in this browser.

Bra Size Calculator

Estimate a starting band and cup size from snug underbust and full-bust measurements.

BTU Calculator

Estimate room heating capacity from floor area, ceiling height, temperature rise, and insulation quality.

Concrete Calculator

Estimate concrete volume for a rectangular slab and add a waste allowance, with cubic-yard and bag totals.

Conversion Calculator

Convert common length, mass, and temperature units in either metric or customary systems.

Date Calculator

Add or subtract calendar years, months, weeks, and days from a date with month-end handling.

Day Counter

Count elapsed and inclusive calendar days, weeks, weekdays, and weekend days between two dates.

Day of the Week Calculator

Find the weekday, day of year, ISO week, quarter, and distance from today for any Gregorian date.

Density Calculator

Calculate density from mass and volume, with common SI and metric conversions.

Dew Point Calculator

Calculate dew point and a plain-language humidity comfort description from temperature and relative humidity.

Electricity Calculator

Estimate appliance energy use and cost from power, daily runtime, days, and electricity rate.

Engine Horsepower Calculator

Calculate engine horsepower and kilowatts from torque and rotational speed.

Fuel Cost Calculator

Estimate trip fuel use, total cost, and cost per traveller from distance and vehicle efficiency.

Gas Mileage Calculator

Calculate L/100 km, kilometres per litre, and miles per US gallon from distance and fuel used.

GDP Calculator

Calculate expenditure-based gross domestic product and the contribution of net exports.

Golf Handicap Calculator

Estimate a World Handicap System-style index from recent score differentials.

GPA Calculator

Calculate a credit-weighted GPA from letter grades and course credits.

Grade Calculator

Calculate a current percentage and the score needed on a remaining final assessment.

Gravel Calculator

Estimate gravel volume, weight, and delivery tonnage from area, depth, and material density.

Heat Index Calculator

Estimate apparent temperature from air temperature and relative humidity with the NOAA regression.

Height Calculator

Estimate a child's mid-parental adult height range from biological-parent heights and the sex adjustment used by the method.

Horsepower Calculator

Calculate mechanical horsepower and watts from force, travel distance, and elapsed time.

Hours Calculator

Calculate elapsed work time between clock times, including overnight shifts and an unpaid break.

IP Subnet Calculator

Calculate IPv4 network, broadcast, usable host range, mask, wildcard, and host capacity from CIDR notation.

Love Calculator

Create a stable, playful name-match score for entertainment, with the same names always returning the same result.

Mass Calculator

Calculate mass from density and volume, with grams, kilograms, and pounds.

Mileage Calculator

Calculate business mileage reimbursement and fuel-cost comparison for a trip.

Molarity Calculator

Calculate solution molarity, millimolar concentration, and amount from moles and volume.

Molecular Weight Calculator

Calculate molar mass from a chemical formula, including grouped formulas such as Ca(OH)2.

Mulch Calculator

Estimate mulch volume and bag count from landscape area, depth, and bag size.

Ohm's Law Calculator

Calculate voltage, current, resistance, and power from any two selected electrical values.

Password Generator

Generate a high-entropy password locally with configurable length and character sets.

Resistor Calculator

Decode a four-band resistor value from colour digits, multiplier, and tolerance.

Roman Numeral Converter

Convert whole numbers to canonical Roman numerals or Roman numerals to decimal values.

Roofing Calculator

Estimate sloped roof area, roofing squares, bundles, and waste from plan dimensions and roof pitch.

Shoe Size Conversion

Estimate equivalent US, UK, and EU adult shoe sizes from one selected system.

Sleep Calculator

Plan bedtimes or wake times around approximate 90-minute sleep cycles and a settling allowance.

Speed Calculator

Calculate speed from distance and time with km/h, m/s, mph, and pace conversions.

Square Footage Calculator

Calculate rectangular area, total quantity, waste allowance, square yards, and square metres.

Stair Calculator

Estimate riser count, actual rise, tread run, staircase length, and stringer length.

Tile Calculator

Estimate tile count, area, and boxes from surface and tile dimensions with grout and waste allowance.

Time Calculator

Add or subtract two hour-minute-second durations and convert the result to total units.

Time Card Calculator

Calculate weekly hours and gross pay from a repeating shift, workdays, break, rate, and overtime settings.

Time Duration Calculator

Calculate elapsed time between two clock times, including overnight spans and break deductions.

Time Zone Calculator

Convert a local date and time between fixed UTC offsets, including dates that cross midnight.

Tip Calculator

Calculate tip, total bill, and per-person split with optional sales tax separated from the tipping base.

Tire Size Calculator

Compare two metric tire sizes for diameter, circumference, sidewall, revolutions, and speedometer difference.

URL Encode / Decode

Encode text for a URL component or decode percent-encoded text locally.

Voltage Drop Calculator

Estimate two-conductor copper or aluminum circuit voltage drop from length, current, voltage, and wire area.

Weight Calculator

Calculate gravitational weight force from mass and local gravitational acceleration.

Wind Chill Calculator

Calculate the North American wind-chill index from air temperature and wind speed.

Data & Calculators: GeoJSON Basics

6 apps

GeoJSON Bounding Box Maker

Find the smallest west, south, east, and north box that holds your GeoJSON.

GeoJSON Center and Centroid Finder

Find the centre of the outer box and the centre made from all shape points.

GeoJSON Coordinate Cleaner

Remove needless repeated points from lines and polygons without changing their visible shape.

GeoJSON Line to Polygon Converter

Close a GeoJSON line and turn it into a polygon feature.

GeoJSON Polygon to Line Converter

Convert polygon rings into GeoJSON lines while keeping the feature properties.

GeoJSON Validator

Check whether GeoJSON is readable and whether each map shape follows the basic geometry rules.

Data & Calculators: Measure & Navigate

7 apps

Bearing and Midpoint Calculator

Find the compass bearing, distance, and halfway point between two map coordinates.

Destination Point Maker

Start at one coordinate, travel a set distance and bearing, and get the destination point.

GeoJSON Area Calculator

Measure a polygon in square metres, square kilometres, hectares, and acres.

GeoJSON Route Length Calculator

Find the full ground distance of a GeoJSON line in kilometres, miles, metres, or nautical miles.

Great Circle Route Maker

Create a curved GeoJSON route that follows the shortest path across the globe between two points.

Map Point Distance Calculator

Find the earth distance between two longitude and latitude pairs.

Point Along Route Finder

Place a point at an exact distance from the start of a GeoJSON route.

Data & Calculators: Select & Compare

7 apps

GeoJSON Line Intersection Finder

Find every point where two GeoJSON lines cross each other.

GeoJSON Point Cluster Analyzer

Group a point collection with K-means or DBSCAN and add a cluster number to every point.

GeoJSON Polygon Overlap Checker

Check whether two polygons touch or overlap, and draw the shared area when one exists.

Nearest Map Point Finder

Compare one target coordinate with a GeoJSON point list and find the closest point.

Nearest Point on Route Finder

Find the closest spot on a GeoJSON route to any longitude and latitude point.

Point in Polygon Checker

Check whether a longitude and latitude point is inside a GeoJSON polygon.

Points in Polygon Filter

Keep only the GeoJSON points that fall inside a polygon or multipolygon.

Data & Calculators: Shape & Transform

11 apps

Convex Hull Maker

Draw the smallest simple convex polygon that wraps around a set of points.

GeoJSON Bounding Box Clipper

Cut a line or polygon so only the part inside a bounding box remains.

GeoJSON Buffer Maker

Draw a set-distance zone around a point, line, or polygon.

GeoJSON Line Offset Maker

Create a new line a set distance to one side of a GeoJSON route.

GeoJSON Polygon Difference Maker

Remove the second polygon from the first and keep the area that remains.

GeoJSON Polygon Dissolve Maker

Merge touching polygons that share the same group property and keep separate groups apart.

GeoJSON Polygon Intersection Maker

Create the map area that two polygons have in common.

GeoJSON Polygon Union Maker

Combine two or more polygons into one polygon or multipolygon result.

GeoJSON Rotate Scale and Move Tool

Rotate a map shape, scale it from its centre, and move it by distance and bearing.

GeoJSON Route Slice Maker

Cut out the part of a GeoJSON route between two distances from its start.

GeoJSON Simplifier

Remove extra coordinates while keeping the main shape of a line or polygon.

Data & Calculators: Grids & Patterns

7 apps

GeoJSON Circle Polygon Maker

Turn a centre point and radius into a GeoJSON polygon that follows ground distance.

GeoJSON Sector Shape Maker

Create a pie-slice map polygon from a centre, radius, start bearing, and end bearing.

Hexagon Map Grid Maker

Create a flat-top hexagon GeoJSON grid for sampling, planning, or map analysis.

Map Point Grid Maker

Create evenly spaced GeoJSON points inside a map bounding box.

Random GeoJSON Point Generator

Create any number of random GeoJSON points inside a bounding box for tests and demos.

Square Map Grid Maker

Create an even square GeoJSON grid inside any west, south, east, and north box.

Voronoi Map Maker

Split a map into cells so every place belongs to its nearest input point.

Data & Calculators: View & Inspect

1 app

CSV Viewer

Open a CSV or TSV file as a clear table, search the rows, and check basic file details without uploading it.

Data & Calculators: Clean & Organize

4 apps

CSV Cleaner

Trim extra spaces, remove empty rows and columns, and repair uneven CSV data in one private pass.

CSV Column Picker

Choose, reorder, and export only the CSV columns you want while leaving the original file untouched.

CSV Sorter

Sort a CSV by any column from A to Z, Z to A, smallest to largest, or largest to smallest.

Remove Duplicate CSV Rows

Find repeated CSV rows by every column or the columns you choose, then keep one clear copy of each row.

Data & Calculators: Convert

3 apps

CSV Delimiter Converter

Change commas, tabs, semicolons, or pipes without breaking quoted text, commas inside cells, or line breaks.

CSV to JSON Converter

Convert CSV or TSV rows into clean JSON objects, with each heading used as a clear field name.

JSON to CSV Converter

Convert a JSON object or list of objects into a spreadsheet-ready CSV with one column for every field.

Data & Calculators: Combine & Split

2 apps

Merge CSV Files

Combine CSV files into one table, match columns by heading, and leave a blank when a file is missing a value.

Split CSV

Break one large CSV into smaller files with the same headings and the exact number of rows you choose.

Data & Calculators: Date Calculators

4 apps

Age Calculator

Find an exact age in years, months, and days, plus the next birthday and useful age milestones.

Business-Day Calculator

Count workdays or add business days using your workweek and a custom holiday list.

Date Difference Calculator

Measure the exact time between two moments in calendar units, hours, minutes, and seconds.

Days Between Dates Calculator

Count calendar days between two dates with clear start-day and end-day inclusion choices.

Data & Calculators: Everyday Math

2 apps

Percentage Calculator

Solve percentage questions, changes, increases, and decreases with the formula shown in plain language.

Unit Converter

Convert length, weight, temperature, area, volume, speed, time, data, energy, and pressure units.

Data & Calculators: Clocks & Timers

3 apps

Countdown Timer

Count down a duration or a future date with quick presets, pause controls, and an optional finish sound.

Stopwatch

Time anything with a precise stopwatch, lap splits, best and slowest laps, and keyboard controls.

World Clock & Meeting Planner

Compare live local times around the world and find a meeting time that lands on the right day.

Data & Calculators: Business Pricing

1 app

Mobile Massage Travel Fee Calculator

Price mobile visits from true trip costs, an included radius, minimum fees, income goals, and groups, then copy a three-zone policy.

Data & Calculators: Business Calculators

2 apps

Massage Room Rent vs Commission Calculator

Compare room rent and commission across working weeks, recovered no-show fees, full costs, hourly earnings, and client break-even.

No-Show Cost, Deposit & Cancellation Window Calculator

Calculate revenue and time lost to no-shows, then optimize a practical deposit, cancellation window, and the net ROI of reminders or a waitlist.

Data & Calculators: Averages & Centers

10 apps

Data & Calculators: Counting & Sampling

8 apps

Data & Calculators: Groups & Breaks

7 apps

Data & Calculators: Percentiles & Outliers

7 apps

Data & Calculators: Probability Distributions

11 apps

Data & Calculators: Relationships & Trends

7 apps

Data & Calculators: Reports & Data

2 apps

Pivot Table Explorer

Open a CSV, choose rows, columns, and a value to total, and explore a pivot table without a spreadsheet app.

Survey Results Analyzer

Open a survey CSV. See a chart for every question, an NPS score, and the mood of written comments.

Data & Calculators: Spread & Shape

6 apps

Data & Calculators: Summary Updates

5 apps

Data & Calculators: Tests & Evidence

5 apps

Data & Calculators: Weighted Statistics

4 apps