Length Converter
Convert between any two length units. Supports US customary, imperial, and metric.
Type an amount, pick your units, get the result. Supports millimeters through nautical miles in one tool. No signup, no popups.
Examples: 5 ft to meters = 1.524 m. 1 mile to km = 1.609 km. 12 inches to cm = 30.48 cm.
How length conversion works
All length conversions go through a single base unit (meters in this tool). The amount is converted from your "from" unit to meters, then from meters to your "to" unit. This two-step approach keeps the math simple and prevents accumulated rounding error across long unit chains.
Common conversions
- 1 inch = 2.54 cm = 25.4 mm
- 1 foot = 12 inches = 30.48 cm = 0.3048 m
- 1 yard = 3 feet = 0.9144 m
- 1 meter = 3.281 feet = 39.37 inches
- 1 mile = 5,280 feet = 1.609 km
- 1 kilometer = 0.621 miles = 1,000 m
When precision matters
For everyday use, two or three decimal places of precision is plenty. For engineering, surveying, or scientific work, this tool returns up to 6 decimal places of precision. For higher precision than that, consult a specialized engineering reference.