Unit Converter

Exact conversions for 15 kinds of units, cups to grams, plain-text input, your own units and your own rates.

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✓ Actually run before listing

Disclaimer: Cooking weights are rounded typical values and vary with brand and how you scoop. Months and years use long-run averages. Currency uses only the rates you enter yourself.

Convert length, weight, volume, temperature, area, speed, time, data size (decimal and binary), energy, power, pressure, force, angle, fuel economy and frequency, with every factor built from an exact definition and checked in tests. Type '5 ft 3 in to cm' or '2 cups flour in grams' and it works out the answer and shows its working. Add units of your own, and keep your own exchange rates, each saved with the date you set it: there are no live rates and no network calls. Cooking weights are typical values, so use them for recipes rather than lab work.

Runs where you work

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Built for a private workflow: local-first execution, no forced cloud dependency, and a clear path to use it on a laptop or phone without an API key.

Included value

Natural-language box with fractions and feet+inchesCooking mode: volume to weight for 19 ingredientsAll-units table with adjustable precision and scientific notationBinary vs decimal data sizes (GB vs GiB) explainedYour own units, saved on your deviceCurrency with rates you type, dated, with an age warningFavourites, history and a printable cheat sheetMental-maths shortcuts with their real error

Each product is designed to feel personal, useful, and complete without turning your work into an external dependency.

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Preview

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This product is a live, in-browser experience — not a file to preview.

Free to play right now, in this browser, no download or account required.

Play now →

Conversions run in your browser. Favourites, history, custom units and your own currency rates are saved on this device.

What's included

Live tool at /play/unit-converter (free, unlimited use)
Commercial license: white-label/embed this tool on your own site

Built with

TypeScriptReact

Runs in your browser: nothing to install

Conversion math in src/lib/unit-converter is pure and tested by scripts/test-unit-converter.ts (538 checks): exact definitions for every unit family, every pair of units round-tripping, the text parser, formatting, custom units, user rates and garbage input.

License & pricing

Try it before you buy. This tool is free to use on the site: open it.

Free to Use

Free

For your own work or your own business. No client work, and no resale or redistribution of the files.

Embed / White-Label License

$34

Use across client work or resell the output. No reselling the source files/template itself.

What these licenses mean →

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