How to Use the Length Unit Converter
Length units differ widely between countries and industries. The metric system (mm, cm, m, km) is the global standard, yet the US and UK routinely use imperial units — inches for screen sizes, feet for altitude and height, yards in sports, and miles for road distances. Mixing systems without conversion leads to costly mistakes.
Enter any value, choose its unit, and this tool instantly shows equivalents in all 8 units simultaneously. No formula lookup or manual arithmetic needed.
Key Length Conversions
- 1 inch (in) = 2.54 cm
- 1 foot (ft) = 12 in = 30.48 cm
- 1 yard (yd) = 3 ft = 91.44 cm
- 1 mile (mi) = 1,760 yd ≈ 1.609 km
Common uses: checking imported furniture dimensions (inches to cm), comparing monitor or TV screen sizes, converting US road distances, verifying aircraft altitudes in feet, and reading product spec sheets with mixed units.
Frequently Asked Questions
Exactly 2.54 cm. A 55-inch TV diagonal is about 139.7 cm; a 6.7-inch phone screen is roughly 17 cm.
1 km ≈ 0.6214 miles; 1 mile ≈ 1.609 km. A 5-mile run is about 8 km; a 10 km race is about 6.2 miles.
1 foot = 0.3048 m (30.48 cm). A 6-foot person is about 182.9 cm. Flight altitudes such as 35,000 ft equal roughly 10,670 m.