Inches to Centimeters Converter: Formula, Table & Tips

The inch-to-centimeter conversion is one of the most frequently used imperial-to-metric conversions. Whether you are measuring your height, buying a TV, or working on a DIY project, knowing how to convert inches to centimeters is essential.

The Exact Conversion

1 inch = 2.54 centimeters exactly

To convert inches to cm: multiply by 2.54
To convert cm to inches: divide by 2.54

Quick Conversion Table

1 in = 2.54 cm | 10 in = 25.4 cm
2 in = 5.08 cm | 20 in = 50.8 cm
3 in = 7.62 cm | 30 in = 76.2 cm
4 in = 10.16 cm | 40 in = 101.6 cm
5 in = 12.7 cm | 50 in = 127 cm
6 in = 15.24 cm | 60 in = 152.4 cm
7 in = 17.78 cm | 70 in = 177.8 cm
8 in = 20.32 cm | 80 in = 203.2 cm
9 in = 22.86 cm | 90 in = 228.6 cm

Common Use Cases

Height conversion: A person who is 5'10" tall is 70 inches or 177.8 cm. Screen sizes: A 55-inch TV measured diagonally is 139.7 cm. Clothing: Waist sizes in inches convert to centimeters for European clothing tags. Use our length converter above for instant results.

Why 2.54 cm per Inch?

The inch was officially defined as exactly 2.54 centimeters in 1959 by international agreement between the US, UK, Canada, Australia, New Zealand, and South Africa. This standardized the conversion for all scientific and commercial purposes.