Unit conversion is used daily in cooking, construction, science, and travel.
Length
1m = 3.28ft. 1km = 0.62mi. 1in = 2.54cm. Quick: km→mi multiply by 0.6. Use our [Unit Converter](/calculators/unit-conversion-calculator) or [miles to km](/convert/mile-to-kilometer).
Weight
1kg = 2.2lb. 1oz = 28.35g. 1 stone = 14lb = 6.35kg.
Volume
1L = 0.26 US gal = 4.23 cups. 1 US gal = 3.79L.
Temperature
C→F: (C×9/5)+32. F→C: (F-32)×5/9. Quick: Double C, add 30.
Digital
1KB = 1024 bytes. 1MB = 1024KB. 1GB = 1024MB. Note: Manufacturers use 1000 (decimal), OS uses 1024 (binary).
Speed
1km/h = 0.62mph. 1 knot = 1.85km/h. Mach 1 ≈ 1235km/h.
Energy
1cal = 4.18J. 1kWh = 3.6MJ. Explore all conversions at [/convert](/convert) and [How Much Is X in Y](/how-much-is).