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Unit converters

Convert between units, number bases and Roman numerals, instantly.

Open the tools 19 tools, all in your browser

Unit conversion is the kind of thing you look up constantly: kilometres to miles, kilos to pounds, Celsius to Fahrenheit, megabytes to gigabytes. The tools here cover the common measures plus number bases and Roman numerals, with the result updating as you type.

Every conversion uses a fixed, exact factor and runs in your browser, so the answer is right and immediate, with nothing to submit.

Which tool for which job

Length converter
Switch between metres, feet, miles and more for a measurement.
Weight converter
Move between kilograms, pounds and ounces for a recipe or a parcel.
Temperature converter
Convert Celsius, Fahrenheit and Kelvin for cooking or weather.
Data converter
Turn bytes into kilobytes, megabytes and gigabytes and back.
Number base converter
Convert between decimal, binary and hexadecimal for code.

Every converter

Questions about the converters

Are the conversions accurate?
Yes. Each uses the exact defined factor between units, so the result is precise, not rounded guesswork.
What can I convert?
Length, weight, temperature, volume, speed, data and pressure, plus number bases and Roman numerals.
Does it need a connection?
Once the page loads, the converters work offline, since the math is done in your browser.
Free?
Yes, free and account-free, supported by light advertising.

Unit converters live on /convert

Free, no account, nothing uploaded.

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