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Everyday measurements, answered with precise math and zero fuss. Your values never leave your browser.
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Millimeters to inches
One of the web’s most searched conversions, ready instantly.
All converters
Choose a measurement
Ten focused categories. No currencies, accounts, or hidden calculations.
Length
Convert metric, imperial, and nautical distances.
9 units →02Mass
Convert everyday metric and imperial mass units.
7 units →03Temperature
Convert Celsius, Fahrenheit, and Kelvin accurately.
3 units →04Area
Convert square metric and customary measurements.
9 units →05Volume
Convert metric, US customary, and imperial volumes without mixing standards.
10 units →06Speed
Convert road, athletic, marine, and scientific speeds.
4 units →07Pressure
Convert common engineering and atmospheric pressure units.
6 units →08Energy
Convert mechanical, electrical, food, and thermal energy.
8 units →09Power
Convert electrical and mechanical power ratings.
4 units →10Data Storage
Convert decimal storage and binary IEC units precisely.
9 units →Built for confidence
Clear math. Useful context.
Locally calculated
Nothing you type is transmitted for calculation.
Standards-aware
US and imperial volume units remain distinct.
Precision by default
Results retain meaningful digits and handle extremes.