Conversion Calculator
Convert between commonly used units. Select the category and units to convert.
Unit Converter
Select a category, input value, and choose units to convert between.
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Conversion:
Why temperature conversion works differently
Length, weight, and volume conversions are simple multiplication — every unit is a fixed multiple of a common base unit (like meters or liters). Temperature scales don't share a common zero point, so converting requires a formula with both a multiplication and an addition/subtraction step (for example, °F = °C × 9/5 + 32) — which is why temperature is handled with dedicated conversion logic rather than the simple multiplier table used for the other categories.
Frequently asked questions
Why is 0°C not 0°F or 0 Kelvin? Each scale defines its zero point differently: Celsius sets 0° at water's freezing point, Fahrenheit sets 0° at a historical brine mixture's freezing point, and Kelvin sets 0° at absolute zero (the theoretical lowest possible temperature) — these different reference points are why simple multiplication doesn't work for temperature.
Are US and UK/metric measurement units the same for volume? Not always — this calculator uses US customary units (US gallon, quart, pint, cup), which differ from Imperial (UK) units of the same name, so double-check which system a recipe or specification is using.
Why would I need to convert weight vs. mass? In everyday use "weight" and "mass" are used interchangeably (as this calculator does with kg, g, lb, oz) — true physics distinguishes them, but that distinction rarely matters for cooking, shipping, or fitness use cases.