Length Converter
By Santaji GadepatilinUpdated October 27, 2026
Length is measured in metric units such as millimetres, metres and kilometres, and imperial units such as inches, feet, yards and miles. This converter handles them all at once.
How to use the length converter
Type a length into any field and every other unit updates instantly. Each field is linked, so you can start from feet, miles or millimetres just as easily as from metres.
Length formula
1 in = 2.54 cm (exact) 1 ft = 12 in = 0.3048 m 1 yd = 3 ft 1 mi = 1,760 yd = 1.609344 km
All imperial lengths are defined from the inch, which has been exactly 2.54 cm since the 1959 international yard and pound agreement — so these conversions are exact, not approximations.
Conversion table
| Metres | Feet |
|---|---|
| 0.5 m | 1.64042 ft |
| 1 m | 3.28084 ft |
| 2 m | 6.56168 ft |
| 5 m | 16.4042 ft |
| 10 m | 32.8084 ft |
| 100 m | 328.084 ft |
| 1,000 m | 3,280.84 ft |
| Feet | Metres |
|---|---|
| 1 ft | 0.3048 m |
| 3 ft | 0.9144 m |
| 6 ft | 1.8288 m |
| 10 ft | 3.048 m |
| 100 ft | 30.48 m |
| 5,280 ft | 1,609.34 m |
Which unit to use
- Metric (mm, cm, m, km) — used for almost all science, engineering and everyday life worldwide.
- Imperial / US customary (in, ft, yd, mi) — everyday use in the United States; feet and inches are also common for heights and screen sizes elsewhere.
Length unit definitions
| Unit | In metres |
|---|---|
| Micrometre (µm) | 0.000001 |
| Millimetre (mm) | 0.001 |
| Centimetre (cm) | 0.01 |
| Inch (in) | 0.0254 |
| Foot (ft) | 0.3048 |
| Yard (yd) | 0.9144 |
| Metre (m) | 1 |
| Kilometre (km) | 1,000 |
| Mile (mi) | 1,609.344 |
| Nautical mile (nmi) | 1,852 |
Imperial relationships
- 12 inches = 1 foot
- 3 feet = 1 yard
- 1,760 yards = 1 mile = 5,280 feet
Very small and very large lengths
| Unit | Size | Used for |
|---|---|---|
| Nanometre (nm) | 10−9 m | Wavelengths of light, chip features |
| Micron (µm) | 10−6 m | Filters, hair (about 70 µm), dust |
| Astronomical unit (AU) | about 149.6 million km | Distances in the solar system |
| Light-year | about 9.46 trillion km | Distances to stars |
Accuracy in practice
Builders typically measure to the nearest millimetre, machinists to 0.01 mm or less, and surveyors to a few millimetres over long distances. Round your converted values to match the precision of the original measurement.
Quick mental shortcuts
- 1 metre ≈ 3 ft 3 in
- 30 cm ≈ 1 foot
- 1 km ≈ 0.62 miles; 8 km ≈ 5 miles
Frequently asked questions
How many feet are in a metre?
One metre is 3.28084 feet.
How many centimetres are in an inch?
Exactly 2.54 cm.
How do I convert 5 ft 10 in to cm?
First convert to inches — 5 × 12 + 10 = 70 in — then multiply by 2.54 to get 177.8 cm.
How many feet are in a metre?
1 metre is 3.2808 feet.
How many inches are in a metre?
1 metre is 39.37 inches.