Everyday life calculators

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

Find a starting square size for the seven-eighths-inch quilting method.

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

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

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

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

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

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

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

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

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

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

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

Estimate travel distance from available fuel and fuel economy.

Compare a service or activity cost with its duration.

Calculate fuel economy, consumption and fuel spending for a trip.

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

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

Compare annual energy use with building floor area.

Estimate hot tub energy cost from average power and operating time.

Estimate energy use and electricity cost for one operating session.

Split a target mixture volume using a water-to-concentrate ratio.

Add up viewing time from episode length, episodes and seasons.

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

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

Express accepted applicants as a share of all applicants.

Calculate words typed per minute before error adjustments.

Estimate average sheet thickness from a measured paper stack.

Convert typing rates using five keystrokes per standard word.

Add luggage length, width and height and express the total in inches.

Estimate download duration from file size and transfer speed, with unit choices.

Connect reading pace, daily reading time, pages and books over a chosen period.

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

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

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

Estimate electricity consumption and cost from power, usage time and energy price.

Compare package prices using a common unit and see which option costs less.

Estimate the time and vehicle costs associated with a recurring commute.

Estimate driving duration from distance and average speed.

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

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

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

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

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