Free tools
Useful by design.
No accounts, no upsells and no documents leaving your device. Just fast tools that do one job properly.
Calculators, fractions, ratios, unit conversions, equation plotting and chart digitizing.
9 in Math & graphing
Percentage
Work out a percentage of a number, compare two numbers, measure change, or add a markup or discount.
Open toolUnit converter
Convert length, weight, temperature, volume, area, speed, time, energy, pressure and data in US and metric units.
Open toolRandom numbers
Generate secure random integers or decimals, with ranges, counts and an optional no-duplicates rule.
Open toolScientific calculator
Evaluate expressions with trigonometry, logarithms, powers, factorials and memory, in degree or radian mode.
Open toolPlot digitizer
Extract data points from a chart image by calibrating the axes, clicking points and exporting a CSV.
Open toolEquation plotter
Graph y = f(x), compare several equations at once, adjust the view window and export sampled points as CSV.
Open toolFractions
Add, subtract, multiply and divide fractions or mixed numbers, simplify the result and see the decimal form.
Open toolRatios
Simplify a ratio, list equivalent ratios, solve a proportion for a missing term and split a total in a given ratio.
Open toolGPA
Turn letter grades or percentages into a credit-weighted semester GPA, and merge prior coursework for a cumulative GPA.
Open toolPrivacy first
Your files and plans stay with you.
PDF, image, HEIC, audio and chart conversions run entirely in your browser. Meal plans are saved to your device's local storage. Loans, currency conversions, health estimates, phone parsing, dates and everyday utilities are calculated on your device and are never tied to an identity.
No document uploads
PDFs are merged locally using the browser.
Instant results
No waiting for a server round-trip.
Transparent math
Standard amortization and US customary recipes.
No accounts
No sign-up, no profiles, no chat history.
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