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Inches to CM Converter

Type a length in inches, including fractions like 5 3/8, to get centimeters and millimeters, then see it at actual size on your screen.

Nearest 1/16 inch
Feet
Millimeters

At actual size (top: cm, bottom: inches)

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Inches to cm

How to convert inches to cm

One inch is exactly 2.54 centimeters, so to convert inches to centimeters, multiply by 2.54. For example, 12 in × 2.54 = 30.48 cm. Fractions work too: type 5 3/8 or 5.375.

Related guides: How to Read a Ruler (Inches and Centimeters) · How to Read a Tape Measure

How to use it

  1. Type a length in inches; fractions such as 3/4 or 5 3/8 work.
  2. Read centimeters, millimeters and feet below.
  3. Tap Calibrate and match a card to see the length at real size on the dual ruler.

Good to know

  • 1 in = 2.54 cm = 25.4 mm exactly.
  • 1 ft = 30.48 cm; 1 yd = 91.44 cm.
  • 1/8 in = 3.175 mm, 1/4 in = 6.35 mm, 1/2 in = 12.7 mm.
  • TV and monitor sizes are measured diagonally, in inches.

Conversion table

InchesCentimetersMillimeters
12.5425.4
25.0850.8
37.6276.2
410.16101.6
512.7127
615.24152.4
717.78177.8
820.32203.2
922.86228.6
1025.4254
1127.94279.4
1230.48304.8
1333.02330.2
1435.56355.6
1538.1381
1640.64406.4
1743.18431.8
1845.72457.2
1948.26482.6
2050.8508
2153.34533.4
2255.88558.8
2358.42584.2
2460.96609.6
3076.2762
3691.44914.4
48121.921219.2
60152.41524
72182.881828.8

Common inch measurements in cm

Everyday sizes in inches and their metric equivalent:

InchescmmmWhat it is
12.5425.41 inch
410.16101.6Short side of a 4×6 photo
615.24152.4Long side of a 4×6 photo
8.521.59215.9Width of US Letter paper
1127.94279.4Length of US Letter paper
1230.48304.81 foot, a standard ruler
3691.44914.4A yardstick
55139.701,397.0A 55-inch TV, measured diagonally
72182.881,828.86 feet

See the length at actual size

The rulers on this page are drawn at real size once your screen is calibrated. Tap Calibrate and match any bank card (accurate to about ±0.5%), or choose your phone or laptop model. It takes about 20 seconds and is saved for next time.

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FAQ

Frequently asked questions

Exactly 2.54 cm. The inch has been defined as exactly 25.4 millimeters since 1959.

Centimeters = inches × 2.54. For example, 6 × 2.54 = 15.24 cm.

Turn the fraction into a decimal (3/8 = 0.375), add the whole inches, then multiply by 2.54: 5 3/8 in = 5.375 × 2.54 = 13.65 cm. Or type 5 3/8 into the converter.

Multiply the feet by 12, add the inches, then multiply by 2.54. For example, 5 ft 8 in = 68 in × 2.54 = 172.72 cm.

Yes. Since 1959 the inch has been defined as exactly 2.54 cm (25.4 mm), so the conversion has no rounding.

Multiply by 2.5 and add a little: 10 in × 2.5 = 25, and the exact answer is 25.4 cm. For an exact result, multiply by 2.54.

1/4 in = 0.64 cm, 1/2 in = 1.27 cm, 1 in = 2.54 cm, 6 in = 15.24 cm, 12 in (1 foot) = 30.48 cm and 36 in (1 yard) = 91.44 cm.

Yes, an inch is 2.54 times longer. A centimeter is a little less than half an inch.