Unit conversions
Each page answers one exact question — with the official conversion factor, a formula, a worked example, a chart of common values and a small calculator.
Length
- Centimeters to inches1 cm = 0.3937 in
- Inches to centimeters1 in = 2.54 cm
- Millimeters to inches1 mm = 0.03937 in
- Inches to millimeters1 in = 25.4 mm
- Meters to feet1 m = 3.2808 ft
- Feet to meters1 ft = 0.3048 m
- Kilometers to miles1 km = 0.62137 mi
- Miles to kilometers1 mi = 1.6093 km
- Inches to feet1 in = 0.083333 ft
- Feet to inches1 ft = 12 in
- Meters to yards1 m = 1.0936 yd
- Yards to meters1 yd = 0.9144 m
- Feet to centimeters1 ft = 30.48 cm
- Centimeters to feet1 cm = 0.032808 ft
- Nautical miles to kilometers1 nmi = 1.852 km
- Kilometers to nautical miles1 km = 0.53996 nmi
Weight
Volume
- Liters to US gallons1 L = 0.26417 gal
- US gallons to liters1 gal = 3.7854 L
- Milliliters to US fluid ounces1 ml = 0.033814 fl oz
- US fluid ounces to milliliters1 fl oz = 29.574 ml
- US cups to milliliters1 cup = 236.59 ml
- Milliliters to US cups1 ml = 0.0042268 cups
- US tablespoons to milliliters1 tbsp = 14.787 ml
- Milliliters to US tablespoons1 ml = 0.067628 tbsp
Temperature
Speed
- Kilometers per hour to miles per hour1 km/h = 0.62137 mph
- Miles per hour to kilometers per hour1 mph = 1.6093 km/h
- Knots to kilometers per hour1 kn = 1.852 km/h
- Kilometers per hour to knots1 km/h = 0.53996 kn
- Meters per second to kilometers per hour1 m/s = 3.6 km/h
- Kilometers per hour to meters per second1 km/h = 0.27778 m/s