Unit Converter
Convert between hundreds of units — length, mass, volume, temperature, area, speed, time, digital data, and more with a single click. Input never leaves your device — everything runs locally in your browser.
How to Use the Unit Converter
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Frequently Asked Questions
What units can this converter handle?
Length (mm, cm, m, km, in, ft, yd, mi) with more unit families available. Enter any value and see the conversion to all supported units instantly.
How many feet are in a meter?
1 meter = 3.28084 feet. All conversions use internationally standardized factors.
How many inches in a centimeter?
1 inch = 2.54 cm exactly. This is a defined international agreement, not an approximation.
How far is a marathon?
A marathon is 42.195 km (26.2 miles). The exact distance was standardized by the IAAF in 1921.
When using Unit Converter, does this converter work offline?
Yes. All conversions run locally in your browser using JavaScript. No data is sent to any server.
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Last updated October 2026