Length Converter

The Length Converter is a tool that converts between different length measurement units used around the world. It supports four conversion tabs: km↔miles, cm↔inches, m↔feet, and m↔yards. The metric system (kilometers, meters, centimeters) is used in most countries worldwide, while the imperial system (miles, feet, inches, yards) is primarily used in the United States, the United Kingdom (for road distances), and a few other countries. This duality creates a frequent need for conversion in international travel, commerce, sports, and everyday life. The meter was originally defined in 1799 as one ten-millionth of the distance from the equator to the North Pole. Today, it is defined by the speed of light: the distance light travels in 1/299,792,458 of a second. The mile has Roman origins ('mille passus' meaning 1,000 paces) and was standardized to 5,280 feet in 1593 by English statute. Whether you're converting height for medical records, understanding road distances in different countries, measuring room dimensions for furniture, or following international sports events, this converter provides instant and accurate results.

1. Select a conversion tab. • km ↔ mile: Convert between kilometers and miles. Useful for driving distances, travel planning. • cm ↔ inch: Convert between centimeters and inches. Common for height, screen sizes, clothing. • m ↔ feet: Convert between meters and feet. Used for building heights, room dimensions. • m ↔ yard: Convert between meters and yards. Common in sports (golf, football fields). 2. Enter a value in either field. Type a number in the left (metric) or right (imperial) input field. The conversion happens automatically in real-time. 3. Read the converted result. The other field instantly displays the converted value. Examples: • Marathon distance: 42.195 km = 26.219 miles • Average male height: 175 cm = 68.9 inches (5 feet 8.9 inches) • Football field: 100 yards = 91.44 meters • Room ceiling: 2.7 m = 8.86 feet Tip: You can enter decimal values for precise conversions. Results are displayed with appropriate decimal places for practical use.

■ Kilometers ↔ Miles 1 mile = 1.609344 km (exact) 1 km = 0.621371 miles Formula: miles = km ÷ 1.609344 Formula: km = miles × 1.609344 Example: 100 km = 100 ÷ 1.609344 = 62.14 miles Example: 60 miles = 60 × 1.609344 = 96.56 km ■ Centimeters ↔ Inches 1 inch = 2.54 cm (exact, defined since 1959) 1 cm = 0.393701 inches Formula: inches = cm ÷ 2.54 Formula: cm = inches × 2.54 Example: 170 cm = 170 ÷ 2.54 = 66.93 inches = 5'6.93" Example: 72 inches (6 feet) = 72 × 2.54 = 182.88 cm ■ Meters ↔ Feet 1 foot = 0.3048 m (exact) 1 m = 3.28084 feet Formula: feet = m ÷ 0.3048 Formula: m = feet × 0.3048 Example: 1.8 m = 1.8 ÷ 0.3048 = 5.906 feet ≈ 5'10.9" Example: 10 feet = 10 × 0.3048 = 3.048 m ■ Meters ↔ Yards 1 yard = 0.9144 m (exact) 1 m = 1.09361 yards Formula: yards = m ÷ 0.9144 Formula: m = yards × 0.9144 Example: 100 m = 100 ÷ 0.9144 = 109.36 yards Example: 100 yards = 100 × 0.9144 = 91.44 m ■ Quick Reference Table 1 inch = 2.54 cm | 1 foot = 30.48 cm | 1 yard = 91.44 cm 1 mile = 1.609 km | 1 km = 0.621 miles | 1 nautical mile = 1.852 km

■ Quick Mental Conversion Tricks • km to miles: Multiply by 0.6 (or multiply by 6 and move decimal left). 100 km ≈ 60 miles. • miles to km: Multiply by 1.6. 60 miles ≈ 96 km. • cm to inches: Divide by 2.5 for rough estimate. 170 cm ≈ 68 inches. • Fibonacci trick for km/miles: Consecutive Fibonacci numbers approximate km-to-mile conversion. 8 km ≈ 5 miles, 13 km ≈ 8 miles. ■ Common Reference Values • Marathon: 42.195 km = 26.219 miles • 5K race: 5 km = 3.107 miles • Half marathon: 21.0975 km = 13.109 miles • Average doorway height: 2.03 m = 6'8" • Standard ceiling height: 2.4 m = 7'10.5" ■ Height Conversion Chart 160 cm = 5'3" | 165 cm = 5'5" | 170 cm = 5'7" 175 cm = 5'9" | 180 cm = 5'11" | 185 cm = 6'1" 190 cm = 6'3" | 195 cm = 6'5" | 200 cm = 6'7" ■ International Context • Speed limits: 100 km/h (Korea/EU) = 62 mph (US equivalent ~65 mph) • US road signs use miles; all distances in Korea use km • Screen sizes (TV, monitor, phone) are measured in inches worldwide • In aviation, altitude is measured in feet globally, but visibility in meters or km ■ Common Mistakes • Don't confuse nautical miles (1.852 km) with statute miles (1.609 km) • When converting height, remember 1 foot = 12 inches, not 10 • Feet-and-inches notation: 5'10" means 5 feet 10 inches, not 5.10 feet