Length Converter

How to Use This Calculator

1. Enter the length or distance value.
2. Select the unit you are converting from.
3. Select the unit you want to convert to.
4. Read the result instantly.

Formula

Example

Frequently Asked Questions

• How many centimeters are in an inch? ▼
  There are exactly 2.54 centimeters in 1 inch. This is a defined (exact) conversion established by the international yard and pound agreement of 1959. Because it is exact, you can multiply any inch measurement by 2.54 to get centimeters with no rounding error. For example, 12 inches (1 foot) = 30.48 cm exactly; 1 yard (36 inches) = 91.44 cm exactly. The reverse conversion — centimeters to inches — uses the factor 1/2.54 ≈ 0.393701. A quick mental shortcut: 1 inch ≈ 2.5 cm (slightly less). This conversion matters most for everyday measurements like screen sizes, paper dimensions, and body measurements, where the US uses inches and most of the world uses centimeters.
• How do I convert miles to kilometers? ▼
  Multiply miles by 1.609344 to get kilometers. This is an exact defined conversion: 1 international mile = 1,609.344 meters = 1.609344 km. For example, 10 miles = 16.09344 km; a marathon (26.2 miles) = 26.2 × 1.609344 = 42.165 km. A useful mental shortcut is to multiply miles by 1.6 for a quick estimate — it is accurate to within 0.6%. To go the other way (km to miles), divide by 1.609344, or multiply by 0.621371. Common reference points: 5 km = 3.107 miles, 10 km = 6.214 miles, 100 km = 62.14 miles. Knots (nautical miles per hour) use the nautical mile, which is 1.852 km — different from the statute mile used in everyday distance.
• How many feet are in a meter? ▼
  One meter equals exactly 3.28084 feet, or more precisely 1/0.3048 feet, which works out to approximately 3.280839895 feet. The conversion factor 0.3048 meters per foot is exact by definition. So 1 foot = 0.3048 m exactly. Practical examples: 1.8 m ≈ 5 feet 10.9 inches (common adult height); 10 m ≈ 32.81 feet; 100 m ≈ 328.08 feet. For height conversion, first convert meters to total inches by multiplying by 39.3701, then divide by 12 to get feet with the remainder in inches. A quick rule of thumb: 3 feet ≈ 0.914 m (just under 1 m). Architects and construction professionals who work across metric and imperial systems use this conversion constantly, as building standards differ between countries.
• How many meters are in a mile? ▼
  One mile equals exactly 1,609.344 meters, or 1.609344 kilometers. This is an exact defined value: the international mile (also called the statute mile) is defined as exactly 5,280 feet, and since 1 foot = 0.3048 m exactly, 1 mile = 5280 × 0.3048 = 1609.344 m. This should not be confused with the nautical mile (used in aviation and navigation), which equals 1,852 meters and is based on one minute of arc along the Earth's surface. The Roman mile (mille passuum, meaning 1,000 paces) was about 1,480 meters, shorter than today's statute mile. For running, a 1-mile race = 1,609 m; a 5K race = 3.107 miles; a 10K = 6.214 miles.
• What is the difference between metric and imperial length? ▼
  The metric system (SI) uses a base-10 structure: 10 millimeters = 1 centimeter, 100 centimeters = 1 meter, 1,000 meters = 1 kilometer. Converting between units is simply multiplying or dividing by powers of 10. The imperial (or US customary) system uses feet, inches, yards, and miles, with non-decimal relationships: 12 inches = 1 foot, 3 feet = 1 yard, 1,760 yards = 1 mile. This makes imperial arithmetic considerably harder. Most of the world uses metric exclusively; the US is the primary holdout for everyday measurements, though US science and medicine use metric. The UK uses a mixture — road signs in miles, body weight in stone, but most goods labeled in metric. In engineering and manufacturing, metric units minimize conversion errors and are internationally preferred.

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