iHow it is calculated
An inch is defined as exactly 2.54 centimeters. To convert, multiply the number of inches by 2.54:
cm = inch × 2.54 · inch = cm ÷ 2.54
A 55-inch TV = 55 × 2.54 = 139.7 cm diagonal. Reverse, 100 cm = 100 ÷ 2.54 ≈ 39.37 inches.
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Math · Updated 2026
Inches to cm
Instantly convert inches to centimeters and back. 1 inch = exactly 2.54 cm.
Enter the value
in
Pick the quantity and units, then enter the value. It converts instantly.
=centimeter
2.54cm
Value to convert1 in
1 in2.54 cm
centimeter2.54 cm
Standard (SI) conversion factors. Instant in-browser calculation, no account. Exact results, with rounding shown.
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?Frequently asked questions
How many cm is 1 inch?
Exactly 2.54 cm. The inch is defined as 2.54 centimeters.
How do I convert cm to inches?
Divide centimeters by 2.54. For example, 30 cm ÷ 2.54 ≈ 11.81 inches.
How wide is a 55-inch TV in cm?
55 × 2.54 = 139.7 cm diagonal. A 65-inch TV is 165.1 cm.
What is an inch?
A length unit from the imperial system, used in the US and UK, equal to 1/12 of a foot.
How much are 6 inches and 12 inches in cm?
6 inches = 15.24 cm; 12 inches = 30.48 cm (exactly 1 foot).
What is the difference between an inch and a foot?
1 foot = 12 inches = 30.48 cm. The inch is the subdivision of the foot.
What is the inch used for?
Screen diagonals (TVs, phones, monitors), pipes, wheels and many US-made products.
How do I convert height in feet and inches to cm?
Turn everything into inches (feet × 12 + inches), then multiply by 2.54. E.g. 5 ft 9 in = 69 in × 2.54 ≈ 175.3 cm.
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