Length
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Fuel economy
Type in any boxPressure
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30 metric ↔ imperial pairs Changes gallons, fl oz, gpm and tons
Length, area & volumeMass & densityForce, pressure & torqueEnergy & powerSpeed, flow & temp.
Everyday and engineering units, converted as you type.
Every result uses the exact legal definition where one exists: an inch is exactly 2.54 cm, a pound is exactly 0.45359237 kg, and a US gallon is exactly 3.785411784 liters. Temperature uses the full formula (°F = °C × 9/5 + 32), not a single factor.
US and UK (imperial) gallons, fluid ounces, pints and tons are different sizes. Standard mode lists both; scientific mode has a US/UK switch. Cups are US customary cups (236.59 mL), and fuel economy converts between US mpg, UK mpg and liters per 100 km at the same time.