Length Converter
Convert millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles and more. Exact definitions, instant results.
· CalcFlow Editorial
1 cm = 0.39370079 in
Results shown are estimates for informational purposes only. Nothing on CalcFlow is financial, tax, legal, or medical advice. Always consult a qualified professional before making important decisions.
Common Length Conversions
| Centimeters | Inches | Millimeters | Meters | Kilometers | Feet |
|---|---|---|---|---|---|
| 1 cm | 0.39370079 | 10 | 0.01 | 0.00001 | 0.032808399 |
| 2 cm | 0.78740157 | 20 | 0.02 | 0.00002 | 0.065616798 |
| 5 cm | 1.9685039 | 50 | 0.05 | 0.00005 | 0.16404199 |
| 10 cm | 3.9370079 | 100 | 0.1 | 0.0001 | 0.32808399 |
| 25 cm | 9.8425197 | 250 | 0.25 | 0.00025 | 0.82020997 |
| 50 cm | 19.685039 | 500 | 0.5 | 0.0005 | 1.6404199 |
| 100 cm | 39.370079 | 1,000 | 1 | 0.001 | 3.2808399 |
| 500 cm | 196.85039 | 5,000 | 5 | 0.005 | 16.404199 |
| 1,000 cm | 393.70079 | 10,000 | 10 | 0.01 | 32.808399 |
Popular Length Conversions
Formula
meters = value x unit factor (1 in = 0.0254 m exactly, 1 ft = 0.3048 m, 1 mi = 1609.344 m)Understanding Length Conversion
Length is measured in the metric system (meters and its multiples) almost everywhere, while the United States still uses inches, feet, yards and miles for everyday distances. Since 1959 the inch has been defined as exactly 2.54 centimeters, so every imperial length converts to metric with an exact factor, not an approximation. This converter pivots every unit through the meter, which keeps results consistent no matter which pair you pick.
Tips and Best Practices
- 1Remember 1 inch = 2.54 cm exactly; multiply inches by 2.54 for centimeters and divide centimeters by 2.54 for inches.
- 2For a quick road estimate, 1 mile is about 1.6 km and 1 km is about 0.62 miles.
- 3Use the swap button when you want the reverse direction without retyping the number.
Real-World Example
A person who is 180 cm tall is 180 / 2.54 = 70.87 inches, which is 5 feet and 10.87 inches. A 10 km run is 10 / 1.609344 = 6.21 miles.
Common Mistakes to Avoid
- Mixing up the international mile (1609.344 m) with the nautical mile (1852 m), which is used at sea and in aviation.
- Treating feet and inches as one decimal number: 5 ft 10 in is 70 inches, not 5.10 feet.
- Rounding the factor too early. Convert first and round only the final answer.
How to Use
- Pick the unit you have in the left selector and the unit you want in the right selector.
- Type a number in either box; the other box updates instantly.
- Use the swap button to reverse the direction and Copy result to copy the answer.
Frequently Asked Questions
How many centimeters are in an inch?
How many feet are in a mile?
What is a nautical mile?
Sources: NIST SP 811 (Guide for the Use of the International System of Units); BIPM SI Brochure; IAU 2012 Resolution B2 (light-year based on 299,792,458 m/s and the Julian year).