Length converter
Convert inches, feet, yards and miles to centimeters, meters and kilometers, and back.
- ๐บ๐ธ US federal & state rules
- NIST SP 811 conversion factors
- See sources
in to cm
30.48 cm
12 in = 30.48 cm
- 1 in
- 2.54 cm
- 1 cm
- 0.3937007874 in
Results are rounded to 10 significant digits.
Common values, in to cm
| 0.5 in | 1.27 cm |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 cm |
| 4 in | 10.16 cm |
| 5 in | 12.7 cm |
| 10 in | 25.4 cm |
| 12 in | 30.48 cm |
| 20 in | 50.8 cm |
| 25 in | 63.5 cm |
| 50 in | 127 cm |
| 100 in | 254 cm |
| 1,000 in | 2,540 cm |
12 in in every unit
| Inches (in) | 12 in |
|---|---|
| Feet (ft) | 1 ft |
| Yards (yd) | 0.3333333333 yd |
| Miles (mi) | 0.0001893939394 mi |
| Millimeters (mm) | 304.8 mm |
| Centimeters (cm) | 30.48 cm |
| Meters (m) | 0.3048 m |
| Kilometers (km) | 0.0003048 km |
| Nautical miles (NM) | 0.0001645788337 NM |
Show the math
| To m | 12 in ร 0.0254 = 0.3048 m |
|---|---|
| To cm | 0.3048 m รท 0.01 = 30.48 cm |
What to do next
How it works
The value is multiplied into meters and then divided by the meter value of the unit you want. One inch is exactly 0.0254 m, one foot is 0.3048 m, one yard is 0.9144 m and one mile is 1,609.344 m. These are exact by international agreement.
Things to keep in mind
For height, enter the total in inches (feet ร 12 plus inches). The converter does not handle mixed feet and inches in one box.
Conversion factors
| 1 in equals | Value |
|---|---|
| Feet (ft) | 0.08333333333 ft |
| Yards (yd) | 0.02777777778 yd |
| Miles (mi) | 0.00001578282828 mi |
| Millimeters (mm) | 25.4 mm |
| Centimeters (cm) | 2.54 cm |
| Meters (m) | 0.0254 m |
| Kilometers (km) | 0.0000254 km |
| Nautical miles (NM) | 0.00001371490281 NM |
Sources
Rules applied as of 2026-10-19. See the sources below for details.
- NIST SP 811, Appendix B.8: Factors for units listed alphabeticallyChecked 2026-10-19
- NIST: U.S. survey foot retired (acre now uses the international foot)Checked 2026-10-19
Frequently asked questions
How many centimeters are in an inch?
Exactly 2.54. The inch has been defined as 2.54 cm since 1959, so 12 inches is 30.48 cm.
How do I convert feet and inches to cm?
Turn it all into inches first, then multiply by 2.54. 5 ft 10 in is 70 inches, which is 177.8 cm.
How many feet are in a mile?
5,280 feet, or 1,760 yards. A mile is 1.609344 km.
Is a nautical mile the same as a mile?
No. A nautical mile is exactly 1,852 m, about 1.15 regular miles. Ships and planes use it.