Length Converter
Convert between millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles. Results update as you type. Last updated: June 2026.
Popular Length Conversions
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Length Conversion Formulas
All metric conversions are exact by definition. The inch, foot, and yard were redefined in 1959 as exact fractions of the metre. The mile is defined as exactly 1,609.344 metres. For a broader look at when and why to reach for each converter, see the full guide to using unit converters.
Frequently Asked Questions
How many cm in an inch?
1 inch = 2.54 centimetres exactly. This is the internationally agreed definition since 1959. To convert inches to centimetres, multiply by 2.54. To go the other way, divide by 2.54.
How do I convert feet to metres?
Multiply the number of feet by 0.3048. One foot equals exactly 0.3048 metres by definition. For example, 6 feet = 6 × 0.3048 = 1.8288 metres.
How many kilometres in a mile?
1 mile = 1.609344 km exactly. To convert miles to kilometres, multiply by 1.609344. To convert km to miles, multiply by 0.621371. A quick mental estimate: multiply km by 0.6 for a rough miles value.
What is 5 feet 11 inches in cm?
Convert each part separately: 5 feet = 5 × 30.48 = 152.4 cm. 11 inches = 11 × 2.54 = 27.94 cm. Total: 152.4 + 27.94 = 180.34 cm.
How many metres in a kilometre?
1 kilometre = 1,000 metres. The prefix "kilo" always means 1,000 in the metric (SI) system. Similarly, 1 kilogram = 1,000 grams and 1 kilolitre = 1,000 litres.