Inches to CM Converter

By in
Updated October 27, 2026

Inches remain common for screens, clothing, tools and pipe sizes, while centimetres are the metric standard. One inch is exactly 2.54 cm. This free inches to CM converter converts instantly in both directions and includes a quick reference table.

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Type in any field to change it. Press × on a value to calculate that field instead.

How to use the inches to CM converter

Type a value in Inches and the other units update instantly. Every field is live, so you can just as easily start from centimetres or any other unit and convert back.

Inches to CM formula

cm = inches × 2.54

1 in = 2.54 cm, and 1 cm = 0.393701 in.

in to cm chart

in cm in cm
0.25 0.635 12 30.48
0.5 1.27 15 38.1
1 2.54 18 45.72
2 5.08 20 50.8
3 7.62 24 60.96
4 10.16 30 76.2
5 12.7 36 91.44
6 15.24 40 101.6
8 20.32 48 121.92
10 25.4 50 127

cm to in chart

cm in cm in
1 0.393701 30 11.811
2 0.787402 40 15.748
5 1.9685 50 19.685
10 3.93701 60 23.622
15 5.90551 75 29.5276
20 7.87402 90 35.4331
25 9.84252 100 39.3701

Definitions

  • Inch: exactly 2.54 cm, by international agreement in 1959. 12 inches make a foot.
  • Centimetre: one hundredth of a metre. 10 mm = 1 cm.

Fractions of an inch in cm

Inch cm Inch cm
1/16 0.159 1/2 1.27
1/8 0.318 5/8 1.588
1/4 0.635 3/4 1.905
3/8 0.953 7/8 2.223

Everyday sizes

  • Phone screens: a 6.1-inch screen is 15.5 cm diagonally.
  • TVs: a 55-inch TV is 139.7 cm diagonally — see the TV size calculator.
  • Clothing: a 32-inch waist is 81.3 cm.
  • Paper: US Letter is 8.5 × 11 in (21.6 × 27.9 cm).

Mental shortcut

Multiply inches by 2.5 for a quick estimate, then add a little. 10 in ≈ 25 cm (exact: 25.4 cm).

Frequently asked questions

How many cm is 1 inch?

Exactly 2.54 cm.

How many cm is 12 inches?

30.48 cm, which is 1 foot.

How many inches is 100 cm?

39.37 inches.

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