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Convert lengths, weights, temperatures, times, and more in real time.
Unit conversion expresses the same physical quantity in a different unit. This tool covers eight everyday categories: length, weight, temperature, area, volume, speed, digital storage, and time.
Length is based on the meter (m) and weight on the kilogram (kg); every other unit is derived by ratio. For example, 1 km equals 1,000 m and one inch is about 0.0254 m.
Temperature is the only category that uses an affine transform instead of a simple ratio — for example °F = °C × 9/5 + 32 and K = °C + 273.15 — which keeps round-trip conversions exact.
How to use it: pick a category from the tabs, type a value, and choose the from and to units — the result updates live. Adjust the decimal precision with the slider, and your recent conversions are saved automatically.
Temperature uses affine transformation. Example: °C = (°F - 32) × 5/9
All factors follow international SI standards
Most units don't support negative values. However, temperature conversions can handle negative values.