Inches to Centimeters Converter

Inches to Centimeters Converter

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Formula: multiply inches by 2.54 to get centimeters

How to convert inches to centimeters

To convert inches to centimeters, multiply the number of inches by 2.54. This is the exact conversion factor — since 1959, one inch has been internationally defined as exactly 2.54 centimeters.

For example, to convert 5 inches to centimeters: 5 × 2.54 = 12.7 cm. To convert 12 inches (1 foot): 12 × 2.54 = 30.48 cm.

Going the other way — to convert centimeters to inches — divide by 2.54, or multiply by 0.3937. So 10 cm ÷ 2.54 = 3.937 inches.

Inches to centimeters conversion table

Inches (in) Centimeters (cm) Millimeters (mm)
¼ inch0.635 cm6.35 mm
½ inch1.27 cm12.7 mm
1 inch2.54 cm25.4 mm
2 inches5.08 cm50.8 mm
3 inches7.62 cm76.2 mm
4 inches10.16 cm101.6 mm
5 inches12.7 cm127 mm
6 inches15.24 cm152.4 mm
9 inches22.86 cm228.6 mm
10 inches25.4 cm254 mm
12 inches (1 ft)30.48 cm304.8 mm
18 inches45.72 cm457.2 mm
24 inches (2 ft)60.96 cm609.6 mm
36 inches (1 yd)91.44 cm914.4 mm
72 inches (6 ft)182.88 cm1828.8 mm

Frequently asked questions

How many centimeters are in an inch?
Exactly 2.54 centimeters equal one inch. This is the internationally agreed-upon definition established in 1959 and has not changed since.
How do I convert inches to cm without a calculator?
Multiply inches by 2.5 for a quick estimate (close enough for most purposes). For exact results, multiply by 2.54. So 10 inches ≈ 25 cm (estimate) or 25.4 cm (exact).
How tall is 5 feet 10 inches in centimeters?
5 feet 10 inches = 70 inches total. 70 × 2.54 = 177.8 cm. This is a very common height conversion needed for international forms and medical records.
What is 6 inches in cm?
6 inches = 15.24 centimeters. Calculation: 6 × 2.54 = 15.24 cm.
What is 12 inches in cm?
12 inches = 30.48 centimeters. This is exactly 1 foot. Calculation: 12 × 2.54 = 30.48 cm.