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Inches to cm Converter

Convert inches to cm and back — exactly 2.54 cm per inch. Everything runs instantly in your browser; nothing is uploaded.

Convert inches ⇄ centimetres

30.48 cm
12 in = 30.48 cm (1 in = 2.54 cm (exact))

Formula: 12 in × 2.54 = 30.48 cm

How the inches to cm conversion works

The converter applies cm = inches × 2.54. The inch is defined as exactly 25.4 mm under the 1959 international yard and pound agreement, so the conversion is exact — no rounding involved. Going the other way, inches = cm ÷ 2.54.

Worked example: a sheet of US letter paper is 8.5 × 11 in, which is 8.5 × 2.54 = 21.59 cm by 11 × 2.54 = 27.94 cm. A 55 in TV is 55 × 2.54 = 139.7 cm corner to corner.

Remember that TV and monitor sizes are always the diagonal. For room dimensions and heights measured in feet, use our feet to meters converter.

inches to cm questions

How many cm are in an inch?
Exactly 2.54 cm. The inch has been defined as 25.4 mm since the 1959 international yard and pound agreement — it is not an approximation.
How do I convert inches to cm?
Multiply by 2.54: cm = inches × 2.54. So 12 in is 12 × 2.54 = 30.48 cm, and 6 in is 15.24 cm. Type any figure above.
How do I convert cm back to inches?
Divide by 2.54: inches = cm ÷ 2.54. So 100 cm is 100 ÷ 2.54 ≈ 39.3701 in, and 50 cm is ≈ 19.685 in. Switch the direction above to do it.
How many cm is a 55 inch TV?
55 in × 2.54 = 139.7 cm. TV sizes are measured diagonally, so a 55 inch set is about 140 cm corner to corner. Other common sizes: 43 in = 109.22 cm, 65 in = 165.1 cm, 75 in = 190.5 cm.
How many inches are in a foot?
There are 12 inches in a foot — and one foot is 12 × 2.54 = 30.48 cm. For full foot-to-metre conversions, use our feet to meters converter.

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Sources & official guidance

Estimate only — the inch is 2.54 cm by international agreement; conversions are exact. See our disclaimer.