Unit Converter

Convert common length units

Enter a value, choose the source unit, and choose the destination unit. The tool converts common length units such as millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. Keep the unit labels visible when copying a result into another document.

Conversion principle

Each unit has a factor relative to a common base unit. The converter multiplies the input by the source factor and divides by the destination factor. This approach keeps the direction clear and avoids silently treating a number as a different unit system.

Worked example

To convert 12 inches to feet, the source value is multiplied by the inch factor and divided by the foot factor, producing 1 foot. For a long distance, confirm whether the context expects statute miles, nautical miles, or another unit system.