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Browse calculators by topic Finance, everyday life, construction, conversions, and more.

313 apps · Showing 193–288

Learning & Reference: Learning Quests

Spelling Spellbook Quest for Kids

Read a friendly clue, type the hidden word, and use a sound-part hint when you need help.

Study Potion Focus Timer for Kids

Choose a short focus quest, use the big timer, and mark the session done when it is time to rest.

Vocabulary Treasure Hunt for Kids

Find six word treasures by choosing the word that fits each clear, fifth-grade-friendly meaning.

Learning & Reference: Letters & Numbers

Lookalike Letter Practice Maker

Compare 1, I, l, O, 0, B, 8, p, q, b, and d on a clear practice page.

Learning & Reference: Light & Twilight

Astronomical Darkness Planner

Find when astronomical night starts, ends, and reaches its darkest point.

Blue Hour Calculator

Estimate morning and evening blue hour using the sun's minus 8 to minus 4 degree range.

Civil Twilight Planner

Find the morning and evening civil-twilight windows around sunrise and sunset.

Daylight Length Calculator

Calculate daylight, night length, sunrise, and sunset for a date and place.

Nautical Twilight Planner

Find when nautical twilight begins and ends before dawn and after dusk.

Twilight Times Calculator

List astronomical, nautical, civil, sunrise, sunset, and night times in order.

Learning & Reference: Maps & Directions

Map Route Animation Maker for Kids

Trace a park walk, treasure hunt, or school route as a moving line on a simple map.

Learning & Reference: Maps & Geography

Continent Coloring Map Maker

Choose a continent, color every country shape in it, and print the map.

Country Size Comparer for Kids

Put two country outlines side by side and see which map shape takes up more space.

World Map Explorer for Kids

Pick a country, see it light up on the map, and learn its capital and languages.

Learning & Reference: Math & Dot Art

Binary Dot Picture Maker

See how rows of zeros and ones can switch dots off and on to draw a tiny picture.

Dot Coordinate Grid Explorer

Move around a 16 by 16 dot grid and see the x, y, and index number for every spot.

Times Table Dot Art Maker

Pick a times table and watch its products light up as a colorful dot pattern.

Learning & Reference: Math & Science

AC Impedance Teaching Lab

Explore how resistors, coils and capacitors affect an AC circuit. Compare series and parallel circuits at a chosen frequency.

Calculus Expression Helper

Find a derivative or integral of a supported expression. Compare the formulas and check the result at a chosen value.

Complex Number Workbench

Calculate with complex numbers such as 3 + 4i. See the answer on a graph and compare its distance and angle.

Descriptive Statistics Desk

Summarize number columns in a CSV file. See averages, ranges, missing values and a chart of how the values are spread.

Fraction Worksheet Checker

Check fraction sums and answers. See common-denominator steps and simplified fractions for each line of your worksheet.

Linear Systems Workbench

Solve a system of linear equations in the form Ax = b. See the solution and how closely it fits each equation.

Matrix Laboratory

Multiply, transpose or invert matrices. Check their size and see warnings when a calculation may be unstable.

Polynomial Exploration Desk

Expand and factor polynomials. Find a derivative and calculate the value of an expression at a point you choose.

Precision Decimal Calculator

Calculate with long decimal numbers. Choose the precision and compare the answer with a standard computer calculation.

Probability Distribution Explorer

Explore probability distributions with charts. Change the settings and see how the curve and chances change.

Recipe Fraction Scaler

Scale a recipe up or down with exact fractions. Keep each ingredient and unit beside its new amount.

Rounding Method Demonstrator

Compare nine ways to round numbers. See what happens with negative numbers and values exactly halfway between two choices.

Scientific Calculator Notebook

Solve calculations in a reusable notebook. Name values, use units and matrices, and use earlier answers in later lines.

Statistical Test Workbench

Run a t-test to compare averages. Choose one sample, paired measurements or two groups, then review the results and assumptions.

Symbolic Algebra Workbench

Simplify, expand or factor an algebra expression. Compare the new form with the original and check a sample value.

Symbolic Computation Worksheet

Work through several algebra or calculus steps in order. Review each result and download the full worksheet.

Tangent-line Visualizer

Draw a function and its tangent line. Move a point along the curve to see how the slope and line equation change.

Unit-aware Formula Calculator

Make a formula with named inputs and units. Change the measurements, calculate again and save the formula for later.

Learning & Reference: Minecraft Learning

Minecraft Biome Explorer for Kids

Pick a biome and learn its climate, temperature, precipitation, category, and dimension.

Minecraft Block Facts Explorer for Kids

Pick a block and see its hardness, light, stack size, transparency, and best tool.

Minecraft Block Hardness Comparer

Put two blocks side by side and see which one is easier or harder to break.

Minecraft Crafting Recipe Helper for Kids

Choose a familiar item and see the ingredients in a clear three-by-three crafting grid.

Minecraft Enchantment Explorer for Kids

Choose an enchantment and see its highest level, item group, treasure flag, and trade flag.

Minecraft Food Points Explorer for Kids

Pick a food and see how many food points it gives and how many fit in one stack.

Minecraft Light Level Explorer for Kids

See how much block light comes from a torch, lantern, glowstone, and other bright blocks.

Minecraft Mob Size Comparer for Kids

Choose two mobs and compare their data-sized shapes from a tiny bee to a tall Enderman.

Minecraft Stack Calculator for Kids

Turn any item count into full stacks, extra items, and the number of inventory slots needed.

Learning & Reference: Moon Planning

Moon Photography Planner

Combine moon position, rise and set times, lit percentage, and phase for one shot time.

Moon Position Calculator

Calculate moon altitude, compass direction, distance, and parallactic angle at one time.

Moonrise & Moonset Calculator

Calculate local moonrise, moonset, and all-day horizon status for a place and date.

Sun & Moon Daily Timeline

Create one ordered local timeline for dawn, sun, twilight, moonrise, and moonset.

Learning & Reference: Museums & Art

Art History Time Traveler for Kids

Slide from ancient Egypt to the 1900s and uncover one museum object at a time.

Art Materials Explorer for Kids

Compare paint, metal, clay, jade, wood, cloth, feathers, and other art materials.

Met Museum Object Explorer for Kids

Meet cats, dragons, masks, paintings, toys, and more from the Met collection.

Learning & Reference: Painting & Drawing

Smooth Line Practice for Kids

Use a steadier brush that softens small pointer wiggles while you trace large dotted paths at your pace.

Learning & Reference: Piano Practice

Find Middle C Piano Practice for Kids

Practice finding middle C on a wide piano without a printed answer on the key.

Learn-a-Melody Piano Trainer for Kids

Follow clear note clues on a real touch piano until you can play the whole tune.

Left and Right Hand Piano Practice for Kids

Follow simple hand clues while low and high piano notes take turns.

Learning & Reference: Reading Practice

Word Pop Sentence Animator for Kids

Make each word in a short sentence pop up clearly in reading order.

Learning & Reference: Routes & Geography

GPX Metadata Inspector

Inspect tracks, points and times in a GPX file. Check recorded heights and approximate distance without uploading your route.

GPX Segment Exporter

Extract one recorded track segment from a GPX file and save it as a new GPX document.

GPX Waypoint Exporter

Extract GPX waypoints into a CSV with names, coordinates, elevations, and timestamps.

Learning & Reference: Science Supports

Atom Motion Model for Kids

Explore a simple helium, carbon, or neon model with moving dots and clear pause controls.

Nature Outline Tracer for Kids

Open a clear nature picture and turn its strongest edges into a simple outline for a study page.

Science Diagram Drawing Animator for Kids

Animate a water cycle, plant-parts picture, or simple circuit one useful line at a time.

Science Observation Sketchbook for Kids

Sketch a leaf, the Moon, or your own object, then circle details and add questions or notes.

Science Process Animator for Kids

Show a seed growing, a water drop moving, or moon phases changing in a few clear frames.

Science Process Stop-Motion for Kids

Capture a safe paper or clay model step by step to explain plant growth, cycles, or states.

Weather Journal Animation for Kids

Put local sky pictures or weather cards in order and watch clouds, rain, and sunshine change.

Weather Loop Animator for Kids

Build a short repeating sky scene with a drifting cloud, falling drops, or soft snowflakes.

Learning & Reference: Scientific File Services

Astronomical Coordinate Converter

Convert sky coordinates between equatorial, Galactic and ecliptic systems. Choose the reference settings and download the new coordinates.

FITS File Explorer

Open a FITS astronomy file. Read its headers, preview image data and download selected table rows with a report.

Learning & Reference: Space & Astronomy

Constellation Line Animator for Kids

Reveal the Big Dipper, Orion, or Cassiopeia by connecting each star in order.