Length Converter
Convert lengths between metric and imperial units including mm, cm, m, km, inches, feet, yards, and miles. Instant results with swap support.
Common conversions
| From | To | Factor |
|---|---|---|
| 1 inch | 2.54 cm | × 2.54 |
| 1 foot | 30.48 cm | × 30.48 |
| 1 yard | 0.9144 m | × 0.9144 |
| 1 mile | 1.60934 km | × 1.60934 |
| 1 km | 0.621371 mi | × 0.621371 |
| 1 meter | 3.28084 ft | × 3.28084 |
| 1 cm | 0.393701 in | × 0.393701 |
About Length Converter
The Length Converter tool lets you translate measurements between metric and imperial length units with a single input. It supports millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles - covering everything from precision engineering dimensions to road-distance calculations.
Select your source unit and target unit from the dropdown menus, type a value, and the result appears in real time. A swap button lets you reverse the direction of conversion without clearing your input, which is useful when you need to go back and forth between two systems.
Beneath the main converter you will find a quick-reference table showing common conversion factors. This is handy when you just need a mental shortcut - for instance, remembering that one kilometer is roughly 0.62 miles or that one foot equals exactly 30.48 centimeters.
Metric and imperial units coexist in many professional fields. Architects and builders in the United States work in feet and inches but often receive material specifications in metric. Runners may think in kilometers while road signs display miles, or vice versa. Scientists almost always use metric, yet everyday measurements in some countries remain imperial. This converter bridges the gap instantly.
Every calculation is performed client-side in your browser. No network request is made, so the tool works offline and keeps your data private. Results are rounded sensibly while maintaining high internal precision, ensuring that chained or cumulative conversions remain accurate.
Frequently Asked Questions
What length units does this converter support?
The tool converts between eight common units - millimeters (mm), centimeters (cm), meters (m), kilometers (km), inches (in), feet (ft), yards (yd), and miles (mi). Select a source and target unit from the dropdown menus and the result updates instantly.
How accurate are the conversions?
All conversions use internationally recognized factors. For example, one inch is defined as exactly 25.4 millimeters and one mile as exactly 1,609.344 meters. Results are displayed to six significant figures to balance precision and readability.
Can I quickly reverse the conversion direction?
Yes. Click the swap button between the source and target unit selectors to reverse them instantly. Your input value stays the same so you can immediately see the conversion in the opposite direction.
What are some common conversions people look up?
The most frequent lookups include kilometers to miles (multiply by 0.621371), inches to centimeters (multiply by 2.54), feet to meters (multiply by 0.3048), and yards to meters (multiply by 0.9144). The quick-reference section beneath the converter lists these and more.