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Length and distance come in two systems — metric (millimetres to kilometres) and imperial (inches to miles) — and converting between them is everyday: a height in feet and inches, a run in kilometres, a screen in inches, a road sign abroad. The factors are exact, so a converter turns any unit into any other instantly.
Enter a value, pick the units, and the converted length appears at once.
How is it calculated?
Key conversion factors
| Conversion | Factor |
|---|---|
| 1 inch | 2.54 cm (exact) |
| 1 foot | 12 in = 0.3048 m |
| 1 yard | 3 ft = 0.9144 m |
| 1 mile | 1,609.344 m = 1.609344 km |
| 1 metre | 3.28084 ft = 39.37 in |
Metric units scale in tens (1 km = 1,000 m); imperial units use fixed steps (12 inches to a foot, 3 feet to a yard, 1,760 yards to a mile).
Metric vs imperial
- Metric (most of the world): mm, cm, m, km.
- Imperial/US: inch, foot, yard, mile.
- Height is often given in feet and inches (US/UK) or centimetres (elsewhere); road distance in miles (US/UK) or kilometres.
Common conversions
- A height of 6 ft is 1.83 m (183 cm).
- A 5K run is 3.1 miles; a marathon is 42.2 km.
- A 55-inch TV screen is 139.7 cm on the diagonal.
- Quick estimate: metres × 3.28 ≈ feet.
Where it helps
- Converting height between feet/inches and centimetres
- Reading a distance abroad in the other system
- Sizing screens, furniture or rooms across units
For a dedicated inches↔cm or miles↔km tool, those exist too; this handles every combination.
Worked example
Convert a 6-foot height to metres: 6 × 0.3048 = 1.8288, so about 1.83 m (or 183 cm). Going the other way, a 100-metre sprint track is 100 ÷ 0.3048 = 328.08 ft. And a mile is exactly 1,609.344 m, or 1.609 km — which is why a 5-kilometre run is 5 ÷ 1.609 = 3.1 miles. The exact factors give precise answers, while the rough "metres × 3.28 ≈ feet" is close enough for a quick sense of scale.
FAQ
How many feet is a metre?+
1 metre = 3.28084 feet (or 39.37 inches). To convert metres to feet multiply by 3.28084; a quick estimate is metres × 3.28.
How do I convert my height to centimetres?+
Convert the height to inches first (1 foot = 12 inches), then multiply by 2.54. 6 ft = 72 in = 182.9 cm. The converter does it in one step.
How many kilometres is a mile?+
1 mile = 1.609344 km (1,609.344 metres). A 5K run is 3.1 miles; a marathon of 42.195 km is 26.2 miles.
How many inches in a foot?+
12 inches make a foot, and 3 feet make a yard. One inch is exactly 2.54 cm, so a foot is 30.48 cm.
What is a 6-foot height in metres?+
6 ft × 0.3048 = 1.83 m (183 cm). The converter handles feet, inches, metres and centimetres in any combination.
Is the inch-to-centimetre conversion exact?+
Yes — since 1959 an inch is defined as exactly 2.54 cm, so all imperial-to-metric length factors derive from that with no rounding.