Length, weight, temperature, volume, area, speed, time, data, energy, force, fuel economy, power, pressure, and angle — batch conversion, favorites, and history, all in your browser.
Click a preset to load it instantly for the current category.
Every unit converted from your current value at once. Search to filter, click ☆ to favorite, or export the full table.
Paste or type one number per line — every value is converted using the From/To units selected above.
No. Every conversion is calculated locally in your browser using standard conversion factors. Favorites and history are saved only in this browser's local storage.
Conversions use internationally accepted conversion factors (SI, NIST, and international standard definitions), computed in full floating-point precision. You control the displayed decimal places.
Celsius, Fahrenheit, Kelvin, and Rankine use different zero points, not just different scale factors, so converting between them requires addition/subtraction as well as multiplication.
Yes. Miles per US gallon, miles per imperial gallon, kilometers per liter, and liters per 100km are all supported, including the inverse relationship between "distance per volume" and "volume per distance" units.
Yes. Use the Batch Conversion panel to paste or type one number per line — every value is converted using your current From/To units at once.
No. Favorites and conversion history are stored only in your browser's local storage on this device and are never uploaded anywhere.
Yes. Click Copy Link to copy a URL with your category, units, and value encoded in it — opening that link pre-fills the same conversion.
Weight/mass units (kilogram, pound, etc.) measure how much matter something has. Force units (newton, pound-force, etc.) measure a push or pull, including gravity's effect on mass — they're listed as separate categories and shouldn't be mixed.
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