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Inches to CM Converter

How to Convert Inches to Centimeters

To convert inches to centimeters, multiply the inch value by 2.54. This conversion factor is exact — it was established by international agreement in 1959. One inch equals exactly 25.4 millimeters or 2.54 centimeters. For example, 70 inches × 2.54 = 177.8 cm. This conversion is commonly needed when shopping internationally, comparing screen sizes, converting height measurements, or working with technical specifications that use different measurement systems.

The Inches to CM Formula

The formula is straightforward: centimeters = inches × 2.54. Since this is an exact definition, there's no approximation involved. For feet and inches combined: first convert feet to inches (multiply by 12), add the remaining inches, then multiply the total by 2.54. For example, 5'10" = (5 × 12) + 10 = 70 inches. Then 70 × 2.54 = 177.8 cm. You can also work in reverse: cm ÷ 2.54 = inches.

Frequently Asked Questions

How many cm is 1 inch?

1 inch equals exactly 2.54 centimeters. This is an exact definition, not an approximation. To convert any inch measurement to centimeters, multiply by 2.54.

How do I convert feet and inches to cm?

First convert feet to inches by multiplying by 12, then add the remaining inches. Finally, multiply total inches by 2.54. Example: 5'8" = (5×12)+8 = 68 inches × 2.54 = 172.72 cm.

What is 6 feet in cm?

6 feet = 72 inches = 182.88 cm. Each foot is 30.48 cm, so 6 × 30.48 = 182.88 cm exactly.

How big is a 55-inch TV in cm?

A 55-inch TV has a diagonal measurement of 139.7 cm (55 × 2.54). For a 16:9 aspect ratio, the screen is approximately 121.7 cm wide and 68.5 cm tall. The overall TV dimensions are slightly larger due to the bezel.

What is the difference between US and UK inches?

There is no difference — the international inch is exactly 25.4 mm in both the US and UK. This was standardized in 1959 when the US, UK, Canada, Australia, New Zealand, and South Africa agreed on the exact conversion: 1 inch = 25.4 mm.

How do I convert inch fractions to cm?

Multiply the fraction in decimal form by 2.54. Common fractions: 1/8" = 0.3175 cm, 1/4" = 0.635 cm, 3/8" = 0.9525 cm, 1/2" = 1.27 cm, 5/8" = 1.5875 cm, 3/4" = 1.905 cm, 7/8" = 2.2225 cm.