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CM to Inches Converter

Type a length in centimeters to get inches, the nearest ruler fraction and feet, 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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CM to inches

How to convert cm to inches

One inch is exactly 2.54 centimeters, so to convert centimeters to inches, divide by 2.54. For example, 10 cm ÷ 2.54 = 3.937 in. The converter also rounds to the nearest 1/16 inch, the smallest mark on most US rulers and tape measures.

Related guides: How to Read a Ruler (Inches and Centimeters) · Paper Sizes Chart (Inches and Millimeters)

How to use it

  1. Type a length in centimeters; inches update as you type.
  2. Read the nearest 1/16 inch to find the mark on a US ruler or tape measure.
  3. Tap Calibrate and match a card to see the length at real size on the dual ruler.

Good to know

  • 1 cm = 0.3937 in, and 1 in = 2.54 cm exactly.
  • 10 cm ≈ 3.94 in; 30 cm ≈ 11.81 in, just under a foot.
  • Quick mental math: divide centimeters by 2.5, then take a little off.

Conversion table

CentimetersInchesNearest 1/16 in1/64 in
10.39373/825/64
20.787413/1625/32
31.18111 3/161 3/16
41.57481 9/161 37/64
51.96851 15/161 31/32
62.36222 3/82 23/64
72.75592 3/42 3/4
83.14963 1/83 5/32
93.54333 9/163 35/64
103.9373 15/163 15/16
114.33074 5/164 21/64
124.72444 3/44 23/32
135.11815 1/85 1/8
145.51185 1/25 33/64
155.90555 7/85 29/32
166.29926 5/166 19/64
176.69296 11/166 11/16
187.08667 1/167 3/32
197.48037 1/27 31/64
207.8747 7/87 7/8
218.26778 1/48 17/64
228.66148 11/168 21/32
239.05519 1/169 1/16
249.44889 7/169 29/64
259.84259 13/169 27/32
2610.236210 1/410 15/64
2710.629910 5/810 5/8
2811.02361111 1/32
2911.417311 7/1611 27/64
3011.81111 13/1611 13/16
3513.779513 3/413 25/32
4015.74815 3/415 3/4
4517.716517 11/1617 23/32
5019.68519 11/1619 11/16
6023.62223 5/823 5/8
7027.559127 9/1627 9/16
8031.496131 1/231 1/2
9035.433135 7/1635 7/16
10039.370139 3/839 3/8

Common cm measurements in inches

Centimeter sizes you see on rulers, paper and screens, converted to inches:

cmInchesRuler markWhat it is
2.541.001Exactly 1 inch
8.563.37≈ 3 3/8Long side of a credit card
155.91≈ 5 7/8Short "15 cm" ruler
218.27≈ 8 1/4Width of A4 paper
29.711.69≈ 11 11/16Length of A4 paper
3011.81≈ 11 13/16Standard metric school ruler
81.2832.0032A 32-inch TV, measured diagonally
10039.37≈ 39 3/81 meter, a little longer than a yard (36 in)

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

1 cm is 0.3937 inches, a little under 2/5 inch. It takes 2.54 cm to make one inch.

Inches = centimeters ÷ 2.54. For example, 25 cm ÷ 2.54 = 9.84 inches.

Divide centimeters by 2.54 to get inches, then divide by 12: the whole number is feet and the remainder is inches. For example, 170 cm = 66.93 in = 5 ft 6.9 in.

Yes. The dual ruler under the converter draws the length at actual size once your screen is calibrated. Tap Calibrate and match a bank card, or pick your device.

Exactly 2.54 cm, so an inch is a little longer than two and a half centimeters.

No. A centimeter is 0.39 inch, a little less than half an inch. An inch is 2.54 times longer.

Multiply by 0.4 (or divide by 2.5) for a quick estimate: 30 cm × 0.4 = 12 in, close to the exact 11.81 in. For an exact answer, divide by 2.54.

5 cm = 1.97 in, 10 cm = 3.94 in, 15 cm = 5.91 in, 20 cm = 7.87 in, 30 cm = 11.81 in and 100 cm (1 meter) = 39.37 in.