Length, weight, temperature, volume, and speed—pick two units and see live conversions as you type.
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Ratio categories convert through a base unit (e.g. meters, kilograms, liters, m/s).
temperature: anchor conversions through Celsius offsets.
US liquid volume uses US customary gallons/quarts/cups/fl oz—not imperial UK gallons.
Factors follow SI definitions and common US customary constants; floating-point output may show harmless rounding digits.