Length Converter
Free length converter for inches, feet, yards, miles, millimeters, centimeters, meters, and kilometers. Instantly convert feet to meters, miles to km, and more.
The quantity you want to convert
Conversion Result
Equivalent In All Units
What Is the Length Converter?
The Length Converter is a free online tool that converts measurements between the most commonly used units of length in everyday life, home improvement, travel, and science. It supports inches, feet, yards, and miles from the imperial/US customary system, alongside millimeters, centimeters, meters, and kilometers from the metric system. Whether you're figuring out how many meters are in a football field or converting a recipe's measurements, this calculator gives you an instant, accurate answer.
How to Use the Length Converter
- Enter the amount you want to convert
- Choose the "From" unit — the unit your original value is in
- Choose the "To" unit — the unit you want to convert to
- Click "Convert Length" to see the result and a full breakdown across every supported unit
Length Conversion Factors Used
All conversions route through meters as a common base unit. The exact factors used are:
| Unit | Equivalent in Meters |
|---|---|
| 1 inch | 0.0254 m |
| 1 foot | 0.3048 m |
| 1 yard | 0.9144 m |
| 1 mile | 1,609.344 m |
| 1 millimeter | 0.001 m |
| 1 centimeter | 0.01 m |
| 1 meter | 1 m |
| 1 kilometer | 1,000 m |
To convert between any two units, the calculator first converts your input to meters, then converts from meters to your target unit. This two-step approach (rather than memorizing a conversion factor for every possible unit pair) keeps the math simple and consistent.
Worked Example
Suppose you want to convert 1 mile to feet. First, convert to the base unit: 1 mile × 1,609.344 = 1,609.344 meters. Then convert meters to feet: 1,609.344 ÷ 0.3048 = 5,280 feet. That matches the well-known fact that a mile is exactly 5,280 feet — a good sanity check for the converter's accuracy.
Practical Notes
- Imperial units (inches, feet, yards, miles) are standard in the United States and, for some everyday measurements, the United Kingdom.
- Metric units (millimeters, centimeters, meters, kilometers) are used almost everywhere else in the world, and throughout science and engineering globally.
- For very small or very large numbers, the calculator will show more decimal places to preserve precision.
- Always double-check critical measurements (construction, shipping, legal documents) using a calibrated instrument — this tool is for planning and estimation.
Need to convert something other than length? Check out our weight converter or temperature converter for more everyday unit conversions.