Choose Conversion Type
Select the type of units you want to convert.
Length
Convert meters, feet, miles, and more
Mass & Weight
Convert kilograms, pounds, and ounces
Temperature
Convert Celsius, Fahrenheit, and Kelvin
Time
Convert seconds, minutes, hours, and days
Area
Convert square meters, acres, and hectares
Volume
Convert liters, gallons, and cubic meters
Speed
Convert km/h, mph, m/s, and knots
Common Conversion Reference
Quick reference for frequently used unit conversions.
Length
- 1 Inch (in)2.54 cm
- 1 Foot (ft)0.3048 m
- 1 Mile (mi)1.609 km
Area
- 1 Acre4047 m²
- 1 Hectare10,000 m²
Mass
- 1 Kilogram (kg)2.205 lb
- 1 Pound (lb)453.6 g
- 1 Ounce (oz)28.35 g
Volume
- 1 Gallon (US)3.785 L
- 1 Fluid Oz (fl oz)29.57 ml
- 1 Cubic Meter (m³)1000 L
Temp
- 0 °C32 °F
- 100 °C212 °F
Time
- 1 Day86,400 s
- 1 Year~3.15e7 s
Speed
- 1 km/h0.62 mph
- 1 m/s3.6 km/h
- 1 Knot1.85 km/h