Length Converter
Convert distances between metric and imperial units.
Converter guide
About Length Converter
The length converter changes a distance among common metric and customary units, including millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. Use it when two measurements describe the same distance with different unit labels.
How to use this converter
- 1Enter the length value in the source-unit field.
- 2Choose the current unit and the unit you want to convert to. Check abbreviations such as ft, in, and mi to avoid choosing the wrong scale.
- 3Read the result and retain suitable precision. For a long chain of calculations, avoid rounding each intermediate conversion.
Conversion method and technical details
Each unit is represented by a factor relative to meters. The input is multiplied by the source factor and divided by the target factor. For example, one inch is exactly 0.0254 meters, and one international mile is 1609.344 meters.
Worked real-world example
Five feet is 60 inches because each foot contains 12 inches. In metric units, five feet is about 1.524 meters.
Common scenarios and use cases
Convert dimensions, travel distances, product sizes, and measurements in school or work. Ensure all values in a calculation use the same unit before adding or comparing them.
For a dependable comparison, confirm both unit labels, keep the original measurement with the converted value, and use the precision required by the task. The converter changes the representation of a value; it does not measure the item or decide which standard your project requires.
Important details and limitations
The tool converts units but does not measure an object or decide whether a unit convention is appropriate. Survey, nautical, historical, and specialized units may differ from common definitions. Check the required standard for technical documents.
Check the output unit as well as the number. If the result will be reused in another calculation, retain full precision where possible and round only at the end. For measurements governed by a technical specification, use the standard and tolerance required by that document.
Frequently asked questions
Is a foot always 12 inches?
Yes, in the international foot used here.
Why can converted values have many decimals?
Some unit relationships produce repeating decimals; display rounding is for readability.
Can I add feet directly to meters?
Convert both lengths to the same unit first, then add them.
Why can the converted number look much larger or smaller?
Different units use different scales. A measurement can have a larger number in a smaller unit and still describe the same quantity. Check the source and target unit labels before comparing values.
How many decimal places should I keep?
Keep enough precision for the job and avoid rounding values between steps. Round the final displayed answer to match the specification, document, or measuring tool you are using.