Length & Distance Unit Converter

• Converts between all common metric units (mm, cm, m, km) and imperial units (in, ft, yd, mi) instantly
• Key factors: 1 inch = 2.54 cm, 1 foot = 30.48 cm = 0.3048 m, 1 mile = 1.60934 km, 1 yard = 0.9144 m
• Adjustable decimal precision from 0 to 10 decimal places for engineering and scientific accuracy
• Real-time bidirectional conversion — results update instantly as you type or change units
• Essential for construction, engineering, travel planning, academic work, real estate, and product dimension specifications

Use Cases

Frequently Asked Questions

How do I convert feet to meters and meters to feet?

Select 'feet' as the source unit and 'meters' as the target unit, then enter your value. 1 foot = 0.3048 meters exactly. For reverse conversion, use the swap button or select meters as source and feet as target. 1 meter = 3.28084 feet. For example, 6 feet = 1.8288 meters, and 2 meters = 6.5617 feet.

How many centimeters are in an inch, and how do I convert inches to cm?

1 inch equals exactly 2.54 centimeters. Select 'inches' as source and 'centimeters' as target. For example, 12 inches = 30.48 cm, 24 inches = 60.96 cm. To convert cm to inches, divide by 2.54: 100 cm = 39.3701 inches. This exact conversion factor (2.54 cm/inch) was internationally agreed upon in 1959.

How do I convert kilometers to miles and miles to kilometers?

Select 'kilometers' as source and 'miles' as target. 1 kilometer = 0.621371 miles, and 1 mile = 1.60934 kilometers. Common examples: 5 km = 3.107 miles (5K race), 10 km = 6.214 miles (10K race), 42.195 km = 26.219 miles (marathon), 100 miles = 160.934 km.

What is the difference between metric and imperial length units?

Metric units (mm, cm, m, km) are based on the meter and use powers of 10 for conversion (1 km = 1000 m, 1 m = 100 cm, 1 cm = 10 mm). Imperial units (in, ft, yd, mi) use non-decimal relationships: 1 foot = 12 inches, 1 yard = 3 feet, 1 mile = 5280 feet. The metric system is used globally for science and in most countries for daily use, while imperial is primarily used in the United States.

Can I adjust the decimal precision of conversion results?

Yes. Use the precision settings to choose anywhere from 0 to 10 decimal places. For everyday measurements, 1-2 decimal places is sufficient. For construction and engineering, 3-4 places is typical. For scientific calculations, 6-10 decimal places may be needed. The conversion factors are exact, so precision is only limited by your display preference.

Is this length converter free and does it work on mobile devices?

Yes. The converter is completely free with no signup, no account, and no usage limits. It works on all devices — smartphones, tablets, and desktop computers — with a responsive interface that adjusts to your screen size. All calculations run instantly in your browser with no data sent to any server.