Length Converter
Convert between metric and imperial lengths — millimeters to miles — with exact international factors.
Common conversions
| From | To | Multiply by |
|---|---|---|
| inches | centimeters | 2.54 (exact) |
| feet | meters | 0.3048 (exact) |
| yards | meters | 0.9144 (exact) |
| miles | kilometers | 1.609344 (exact) |
| nautical miles | kilometers | 1.852 (exact) |
Frequently asked questions
Are these factors exact?
Yes. Since 1959 the international yard has been defined as exactly 0.9144 m, which makes the inch exactly 2.54 cm and the mile exactly 1.609344 km — no rounding involved.
What's the difference between a mile and a nautical mile?
A nautical mile (1852 m) is based on one minute of latitude and is used in aviation and shipping. It's about 15% longer than the statute mile (1609.344 m) used on roads.
How do I convert height like 5'10" to cm?
Convert the feet and inches separately and add them: 5 ft = 152.4 cm, 10 in = 25.4 cm, so 5'10" = 177.8 cm.
Last updated: 2026-07-13