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Unit Converters

Convert between metric, imperial, and other unit systems — all calculations run instantly in your browser.

Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly.
Length Converter
Convert between mm, cm, m, km, inches, feet, yards, and miles.
Weight Converter
Convert between mg, g, kg, tonnes, ounces, pounds, and stones.
Data Size Converter
Convert between bits, bytes, KB, MB, GB, TB, and PB instantly.
Speed Converter
Convert between km/h, m/s, mph, knots, and ft/s.

About Unit Converters

Unit conversion is one of the most frequent practical calculations people need — converting temperatures for cooking or weather, lengths for construction or travel, weights for fitness or shipping, data sizes for storage planning, and speeds for vehicle or weather comparisons. useTool's unit converters handle all conversions in real time as you type, with no need to click a calculate button or wait for a result.

All five converters in this category use the same pattern: type a value in any field and all other units update instantly. The temperature converter handles Celsius, Fahrenheit, Kelvin, and Rankine. Length covers millimetres through miles. Weight handles milligrams through metric tonnes including imperial stones. Data size uses binary convention (1 KB = 1024 bytes) from bits to petabytes. Speed covers km/h, mph, m/s, knots, and ft/s. All calculations run locally in your browser with no data sent anywhere.

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