Length Converter Guide: All Length Units Explained
From millimetres to miles, length conversions are needed every day — in construction, travel, sport, and everyday measurements. Here's a complete reference.
Length Unit Reference Table
| Unit | In metres | Common use |
|---|---|---|
| Millimetre (mm) | 0.001 m | Engineering, precision work |
| Centimetre (cm) | 0.01 m | Height, clothing sizes |
| Metre (m) | 1 m | Room dimensions, swimming pools |
| Kilometre (km) | 1,000 m | Road distances, geography |
| Inch (in) | 0.0254 m | Screen sizes, US measurements |
| Foot (ft) | 0.3048 m | US construction, altitude |
| Yard (yd) | 0.9144 m | Football fields, fabric |
| Mile (mi) | 1,609.34 m | Road distances (US/UK) |
Most Common Conversions
Frequently Asked Questions
How many centimetres are in an inch?
1 inch = 2.54 centimetres (exactly). This is the internationally defined conversion. So 12 inches (1 foot) = 30.48 cm, and 1 yard (36 inches) = 91.44 cm.
How do I convert feet and inches to centimetres?
Convert feet to inches first (×12), add remaining inches, then multiply total inches by 2.54. For example, 5 feet 9 inches = (5×12 + 9) × 2.54 = 69 × 2.54 = 175.26 cm.
How many kilometres in a mile?
1 mile = 1.60934 kilometres. 1 km = 0.62137 miles. For a rough estimate: multiply miles by 1.6 to get km, or multiply km by 0.6 to get miles.
What is a nautical mile?
1 nautical mile = 1.852 km = 1.15078 statute miles. It is based on the circumference of the Earth — one nautical mile equals one minute of latitude. Used in aviation and maritime navigation.
How do I convert metres to yards?
1 metre = 1.09361 yards. 1 yard = 0.9144 metres. For a quick estimate: 1 metre is slightly longer than 1 yard. 100 metres ≈ 109 yards.
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