Length Converter
Convert between metric and imperial length units instantly. Type any value to update all fields simultaneously.
Common Length Conversions
How many centimetres are in an inch?
1 inch equals exactly 2.54 centimetres. This is the defined conversion — there's no rounding involved. So 12 inches (1 foot) = 30.48 cm, and 6 feet = 182.88 cm (roughly 183 cm).
How many feet are in a metre?
1 metre equals approximately 3.28084 feet, or 3 feet 3.37 inches. To convert metres to feet, multiply by 3.281. To go the other way, multiply feet by 0.3048.
How many kilometres in a mile?
1 mile equals 1.60934 kilometres. A quick mental approximation is to multiply miles by 1.6. So 10 miles ≈ 16 km, and 26.2 miles (a marathon) ≈ 42.2 km.
What is the difference between metric and imperial length?
Metric (mm, cm, m, km) uses powers of 10 — each unit is 10× the previous. Imperial (inches, feet, yards, miles) uses less regular relationships: 12 inches = 1 foot, 3 feet = 1 yard, 1,760 yards = 1 mile. The UK officially uses metric but informally uses miles for road distances and feet/inches for height.