Free Length Converter
Convert between inches, feet, yards, miles, meters, kilometers, and more. Instant length and distance unit conversion tool.
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Formula
Converted Value = Input Value × (Source Unit in meters) ÷ (Target Unit in meters)How to Convert Length and Distance Units
This converter handles all standard imperial and metric length units. Every conversion works by first translating your input into meters (the SI base unit), then converting from meters to your target unit. This ensures accurate results for any unit pair.
Imperial vs. Metric Length Units
The world uses two main measurement systems. The imperial system (inches, feet, yards, miles) is used primarily in the United States, while the metric system (millimeters, centimeters, meters, kilometers) is used by the rest of the world and in all scientific contexts.
- Inches — used for small measurements, screen sizes, and height. 1 inch = 2.54 cm.
- Feet — standard for room dimensions and personal height in the US. 1 foot = 12 inches = 0.3048 m.
- Yards — used in football, fabric, and landscaping. 1 yard = 3 feet = 0.9144 m.
- Miles — used for road distances in the US and UK. 1 mile = 5,280 feet = 1.609 km.
- Millimeters — precision measurements and engineering. 1 mm = 0.03937 inches.
- Centimeters — everyday metric measurements. 1 cm = 10 mm = 0.3937 inches.
- Meters — the SI base unit for length. Roughly 3.28 feet.
- Kilometers — road distances outside the US. 1 km = 0.621 miles.
Quick Reference Distances
- Doorway height: 6 ft 8 in (203 cm)
- Basketball hoop: 10 feet (3.05 m)
- Football field: 100 yards (91.44 m)
- Marathon: 26.2 miles (42.195 km)
Whether you're converting dimensions for an international recipe, figuring out your height in metric, or working on a construction project, this tool gives you instant, accurate results.
Frequently Asked Questions
How many feet are in a mile?
There are 5,280 feet in one mile. This equals 1,760 yards or 1,609.344 meters.
How do I convert inches to centimeters?
Multiply inches by 2.54 to get centimeters. For example, 12 inches × 2.54 = 30.48 cm. To go the other way, divide centimeters by 2.54.
What is the difference between a mile and a kilometer?
A mile is about 1.609 kilometers, so a kilometer is roughly 0.621 miles. A quick mental trick: multiply km by 0.6 to estimate miles, or multiply miles by 1.6 to estimate km.
How tall is 6 feet in centimeters?
6 feet equals 182.88 centimeters or 1.8288 meters. To convert any height in feet and inches, first convert everything to inches (feet × 12 + inches), then multiply by 2.54.
What length units are used in construction?
In the US, construction typically uses feet and inches (often as fractions like 5/8"). Internationally, millimeters and meters are standard. Lumber dimensions in the US are nominal — a 2×4 actually measures 1.5" × 3.5".