Length Converter: mm, cm, m, km, in, ft, mi
By Hesaplayıcı
The length converter converts a length between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles and nautical miles. Enter the value and choose the two units. You get the result and the same length in all nine units. The factors come from the international definitions: one inch is exactly 2.54 centimeters.
Worked example: How many kilometers is 1 mile?
Result
1.61 km
In other units
- Millimeter
- 1,609,344 mm
- Centimeter
- 160,934.4 cm
- Meter
- 1,609.34 m
- Inch
- 63,360 in
- Foot
- 5,280 ft
- Yard
- 1,760 yd
- Mile
- 1 mi
- Nautical mile
- 0.87 nmi
Step by step
factor = from unit (m) / to unit (m)
factor = 1,609.344 / 1,000 = 1.61
Result
result = value × factor
result = 1 × 1.609344 = 1.61 km
How to use
- Enter the Length you want to convert.
- In From, choose the unit of the value.
- In To, choose the unit of the result and press Calculate.
Formula
result = value × factor, where factor = from unit in meters / to unit in meters.
The size of each unit in meters is exact by definition:
- 1 mm = 0.001 m; 1 cm = 0.01 m; 1 km = 1,000 m
- 1 inch = 0.0254 m (2.54 cm)
- 1 foot = 12 inches = 0.3048 m
- 1 yard = 3 feet = 0.9144 m
- 1 mile = 5,280 feet = 1,609.344 m
- 1 nautical mile = 1,852 m
The inch, foot, yard and mile are tied to the meter by the 1959 international yard and pound agreement.
Worked example
The worked example on this page converts 1 mile to kilometers. The first step gives the factor between the two units; the second gives the result.
Limits
The mile is the international mile. The US survey mile, old local units and units of area or volume are not included. Negative lengths are not accepted. Results are rounded to 12 significant digits; the page may shorten very small numbers, while the API and MCP return every digit.
Frequently Asked Questions
How many centimeters are in an inch?
One inch is exactly 2.54 centimeters. The value has been exact by definition since 1959.
How many kilometers is a mile?
The international mile is exactly 1.609344 kilometers, or 1,609.344 meters. A mile is 5,280 feet.
What is the difference between a nautical mile and a mile?
A nautical mile is exactly 1,852 meters and is used at sea and in aviation. The international (statute) mile is 1,609.344 meters.
How many centimeters are in a foot?
A foot is 12 inches, which is exactly 30.48 centimeters.
Calculation rules
- The factors are exact by definition: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 yard = 0.9144 m, 1 mile = 1,609.344 m (1959 international yard and pound agreement), 1 nautical mile = 1,852 m.
- The mile is the international mile. The US survey mile and old local units are not used.
- Results are rounded to 12 significant digits, which only removes tiny floating-point errors. The page may shorten numbers; the API and MCP return all 12 digits.