Length Converter
Select source unit, enter value and see all conversions immediately.
m
feet (ft)
inches (in)
km
miles (mi)
Length Converter – Convert Length Units Instantly
The length converter converts between metric and imperial length units in real time. Enter a value and select a unit to see results in centimeters, meters, feet, inches, kilometers, and miles instantly.
Length Unit Conversion Table
| Unit | Abbreviation | Equivalent in Meters | System |
|---|---|---|---|
| Millimeter | mm | 0.001 m | Metric |
| Centimeter | cm | 0.01 m | Metric |
| Meter | m | 1 m | Metric |
| Kilometer | km | 1,000 m | Metric |
| Inch | in | 0.0254 m | Imperial |
| Foot | ft | 0.3048 m | Imperial |
| Yard | yd | 0.9144 m | Imperial |
| Mile | mi | 1,609.34 m | Imperial |
Most Common Conversions
These are the conversions Americans search for most frequently:
Inches ↔ Centimeters:
1 inch = 2.54 cm (exact definition)
| Inches | Centimeters | Common Use |
|---|---|---|
| 1 in | 2.54 cm | Small measurements |
| 12 in (1 ft) | 30.48 cm | Rulers |
| 55 in | 139.7 cm | 55" TV diagonal |
| 65 in | 165.1 cm | 65" TV diagonal |
| 75 in | 190.5 cm | 75" TV diagonal |
Feet ↔ Meters (Height Conversion):
1 foot = 0.3048 meters = 30.48 cm
| Height (ft/in) | Centimeters | Meters |
|---|---|---|
| 5'0" | 152.4 cm | 1.524 m |
| 5'4" | 162.6 cm | 1.626 m |
| 5'7" | 170.2 cm | 1.702 m |
| 5'10" | 177.8 cm | 1.778 m |
| 6'0" | 182.9 cm | 1.829 m |
| 6'2" | 188.0 cm | 1.880 m |
| 6'5" | 195.6 cm | 1.956 m |
Miles ↔ Kilometers:
1 mile = 1.60934 km · 1 km = 0.62137 miles
| Miles | Kilometers | Context |
|---|---|---|
| 1 mi | 1.61 km | Basic conversion |
| 5 mi | 8.05 km | 5K race ≈ 3.1 mi |
| 10 mi | 16.09 km | 10K race ≈ 6.2 mi |
| 26.2 mi | 42.2 km | Marathon |
| 100 mi | 160.9 km | Road trip distance |
Why the U.S. Uses Imperial Units
The United States is one of only three countries (along with Myanmar and Liberia) that has not officially adopted the metric system as its primary measurement system. While the metric system was legalized for trade in 1866, widespread adoption never occurred due to the massive cost of switching infrastructure, road signs, product labels, and consumer habits. Congress passed the Metric Conversion Act of 1975, but it was voluntary and had limited impact.
In practice, many American industries already use metric: science, medicine, pharmaceuticals, the military, and automotive manufacturing. The National Institute of Standards and Technology (NIST) actually defines U.S. customary units in terms of metric equivalents — the inch is officially defined as exactly 25.4 millimeters.
Quick Conversion Tips
- Miles to km: Multiply by 1.6 (or use the Fibonacci sequence — each number is approximately the km equivalent of the previous number in miles: 5 mi ≈ 8 km, 8 mi ≈ 13 km)
- Feet to meters: Divide by 3.28, or multiply by 0.3
- Inches to cm: Multiply by 2.54 (exact)
- Cm to inches: Divide by 2.54, or multiply by 0.394
Frequently Asked Questions
How many feet are in a meter?
One meter equals approximately 3.28084 feet. Conversely, one foot equals 0.3048 meters (exact definition).
How do I convert inches to centimeters?
Multiply inches by 2.54 to get centimeters. For example, 12 inches × 2.54 = 30.48 cm. This conversion factor is exact by definition.
How many miles are in a kilometer?
One kilometer equals 0.621371 miles. One mile equals 1.60934 kilometers. A quick approximation: multiply km by 0.6 to get miles.
What is the difference between imperial and metric length units?
The metric system uses meters, centimeters, and kilometers (based on powers of 10). The imperial system uses inches, feet, yards, and miles. The U.S. is one of three countries still primarily using imperial units.
How tall is 6 feet in centimeters?
6 feet equals 182.88 centimeters (6 × 12 inches = 72 inches × 2.54 cm/inch = 182.88 cm).
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