Inches to CM

Convert inches to centimetres, metres, feet, and millimetres. Type in any field and all other units update instantly.

Enter Length

Inches (in)12 in

01,000 in

Centimetres (cm)

Metres (m)

Feet (ft)

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Centimetres

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Millimetres—

Yards—

Common Reference—

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Did You Know?

TV and monitor sizes

Screen sizes are measured diagonally in inches. A 55-inch TV = 139.7 cm diagonal. A 27-inch monitor = 68.6 cm. When shopping for furniture or wall space, divide the inch size by 2.54 to get the exact centimetres.

How to use this calculator

Type in any field

Enter inches, cm, metres, or feet and all other fields update live.

Use the slider

Sweep the inches slider from 0 to 1,000 for quick exploration.

Read the reference

Common reference puts the measurement in everyday context.

The formula explained

1 inch = 2.54 centimetres exactly

1 cm = 0.393701 inches

The 2.54 cm/inch definition has been exact since 1959 (International Yard and Pound Agreement). 12 inches = 1 foot = 30.48 cm. 36 inches = 1 yard = 91.44 cm.

Frequently Asked Questions

How many cm is 1 inch?

Exactly 2.54 cm. So 6 inches = 15.24 cm, 12 inches = 30.48 cm, 24 inches = 60.96 cm.

How many inches is 30 cm?

30 ÷ 2.54 = 11.81 inches. A standard 30cm ruler is almost exactly 12 inches (11.81 in).

What is 5 inches in cm?

5 × 2.54 = 12.7 cm.

Quick mental conversion for inches to cm?

Multiply by 2.5 for a close approximation (actual is 2.54). So 10 inches ≈ 25 cm (actual: 25.4 cm). The error is only 1.6%.

How many cm is 6 inches?

6 inches equals 15.24 centimetres. To convert inches to centimetres, multiply by 2.54.