Inches to cm Converter (in to cm)
Type in either box to convert inches to centimetres or cm to inches. Use feet and inches, millimetres and fractions like 5 3/8, with the sum shown in your numbers.
Fractions round inch answers to the nearest 1/16 inch and so on. Advanced adds 1/2 to 1/64, more units and scientific notation.
Paste a list of numbers, one per line. Each line is converted with the units above.
Common examples
Tap one to put it in the converter.
Inches to cm and cm to inches charts
| Inches | Centimetres |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 cm |
| 4 in | 10.16 cm |
| 5 in | 12.7 cm |
| 6 in | 15.24 cm |
| 7 in | 17.78 cm |
| 8 in | 20.32 cm |
| 9 in | 22.86 cm |
| 10 in | 25.4 cm |
| 11 in | 27.94 cm |
| 12 in | 30.48 cm |
| 14 in | 35.56 cm |
| 15 in | 38.1 cm |
| 16 in | 40.64 cm |
| 18 in | 45.72 cm |
| 20 in | 50.8 cm |
| 24 in | 60.96 cm |
| 30 in | 76.2 cm |
| 36 in | 91.44 cm |
| 40 in | 101.6 cm |
| 48 in | 121.92 cm |
| 50 in | 127 cm |
| 60 in | 152.4 cm |
| 72 in | 182.88 cm |
| 100 in | 254 cm |
| Centimetres | Inches |
|---|---|
| 1 cm | 0.39 in |
| 2 cm | 0.79 in |
| 3 cm | 1.18 in |
| 5 cm | 1.97 in |
| 10 cm | 3.94 in |
| 15 cm | 5.91 in |
| 20 cm | 7.87 in |
| 25 cm | 9.84 in |
| 30 cm | 11.81 in |
| 40 cm | 15.75 in |
| 50 cm | 19.69 in |
| 60 cm | 23.62 in |
| 70 cm | 27.56 in |
| 75 cm | 29.53 in |
| 80 cm | 31.50 in |
| 90 cm | 35.43 in |
| 100 cm | 39.37 in |
| 120 cm | 47.24 in |
| 150 cm | 59.06 in |
| 200 cm | 78.74 in |
Fractions of an inch in mm and cm
| Inch | Millimetres | Centimetres |
|---|---|---|
| 1/16 in | 1.5875 mm | 0.1588 cm |
| 1/8 in | 3.175 mm | 0.3175 cm |
| 3/16 in | 4.7625 mm | 0.4762 cm |
| 1/4 in | 6.35 mm | 0.635 cm |
| 5/16 in | 7.9375 mm | 0.7938 cm |
| 3/8 in | 9.525 mm | 0.9525 cm |
| 7/16 in | 11.1125 mm | 1.1112 cm |
| 1/2 in | 12.7 mm | 1.27 cm |
| 9/16 in | 14.2875 mm | 1.4288 cm |
| 5/8 in | 15.875 mm | 1.5875 cm |
| 11/16 in | 17.4625 mm | 1.7463 cm |
| 3/4 in | 19.05 mm | 1.905 cm |
| 13/16 in | 20.6375 mm | 2.0637 cm |
| 7/8 in | 22.225 mm | 2.2225 cm |
| 15/16 in | 23.8125 mm | 2.3813 cm |
| 1 in | 25.4 mm | 2.54 cm |
Screen sizes (diagonal)
| Screen | Inches | cm |
|---|---|---|
| Phone screen | 6.1 in | 15.494 cm |
| Phone screen | 6.7 in | 17.018 cm |
| Tablet screen | 10.9 in | 27.686 cm |
| Laptop screen | 13.3 in | 33.782 cm |
| Laptop screen | 15.6 in | 39.624 cm |
| Monitor | 24 in | 60.96 cm |
| Monitor | 27 in | 68.58 cm |
| TV | 32 in | 81.28 cm |
| TV | 43 in | 109.22 cm |
| TV | 55 in | 139.7 cm |
| TV | 65 in | 165.1 cm |
| TV | 75 in | 190.5 cm |
Heights: cm to feet and inches
| Height | Feet and inches |
|---|---|
| 150 cm | 4 ft 11.1 in |
| 155 cm | 5 ft 1.0 in |
| 160 cm | 5 ft 3.0 in |
| 165 cm | 5 ft 5.0 in |
| 170 cm | 5 ft 6.9 in |
| 175 cm | 5 ft 8.9 in |
| 180 cm | 5 ft 10.9 in |
| 185 cm | 6 ft 0.8 in |
| 190 cm | 6 ft 2.8 in |
| 195 cm | 6 ft 4.8 in |
| 200 cm | 6 ft 6.7 in |
Paper and photo sizes
| Size | Inches | Metric |
|---|---|---|
| US Letter | 8.5 × 11 in | 21.59 × 27.94 cm |
| US Legal | 8.5 × 14 in | 21.59 × 35.56 cm |
| Tabloid / Ledger | 11 × 17 in | 27.94 × 43.18 cm |
| Photo 4 × 6 | 4 × 6 in | 10.16 × 15.24 cm |
| Photo 5 × 7 | 5 × 7 in | 12.7 × 17.78 cm |
| A3 | 11.69 × 16.54 in | 297 × 420 mm |
| A4 | 8.27 × 11.69 in | 210 × 297 mm |
| A5 | 5.83 × 8.27 in | 148 × 210 mm |
| A6 (postcard) | 4.13 × 5.83 in | 105 × 148 mm |
More converters
How your length is converted
Your numbers, step by step. 1 inch is exactly 2.54 cm.
- 1
Your length
12 in
- 2
The exact factor
1 in = 2.54 cm
- 3
Multiply
12 × 2.54 = 30.48 cm
- 4
Exact answer
30.48 cm exactly
Read more: the formula, a worked example, cm to inches and fractions
The formula
centimetres = inches × 2.54
inches = centimetres ÷ 2.54
millimetres = inches × 25.4
total inches = feet × 12 + inches
An inch is defined as exactly 2.54 cm, so inches to centimetres never needs rounding beyond the inches you start with. Going the other way, dividing by 2.54 usually gives a long decimal (1 cm = 0.393700787… in), so the answer is rounded.
Worked example
Convert 12 inches to centimetres: 12 × 2.54 = 30.48 cm exactly. That is one foot, and also 304.8 mm.
With feet and inches, turn it all into inches first. 5 ft 9 in is 5 × 12 + 9 = 69 inches, and 69 × 2.54 = 175.26 cm.
Centimetres to inches
Divide by 2.54. 100 cm ÷ 2.54 ≈ 39.3701 inches, which is 39.37 in to two decimal places or 39 3/8 in to the nearest 1/16. To split into feet, take out whole lots of 12 inches: 39.37 inches is 3 feet (36 inches) with 3.37 inches left over. Press the swap button (⇄) to turn the converter round.
Fractions of an inch
Tape measures in the US mark inches in halves, quarters, eighths and sixteenths. You can type fractions such as 3/8, 5 3/8 or ½, and choose a fraction under "Round to" to get inch answers like 39 3/8 in. A sixteenth of an inch is 1.5875 mm, so rounding to 1/16 is never more than about 0.8 mm out.
1 inch = 2.54 cm exactly (international inch, NIST SP 811). A4 and A-series sizes are from ISO 216; US Letter is 8.5 × 11 in. Checked 11 October 2026.
Common questions
How many cm are in an inch?
One inch is exactly 2.54 centimetres, or 25.4 millimetres. That is the international definition, so the conversion is exact: 12 inches (one foot) is 30.48 cm, and 10 inches is 25.4 cm. To convert inches to cm, multiply by 2.54.
How do you convert cm to inches?
Divide the centimetres by 2.54. So 100 cm is 100 ÷ 2.54 ≈ 39.37 inches, and a 30 cm ruler is about 11.81 inches. Multiplying by 0.3937 gives almost the same answer. To get feet and inches, divide the inches by 12: 175 cm is 68.9 inches, which is 5 ft 8.9 in.
What is 5 ft 7 in in cm?
First turn it all into inches: 5 × 12 + 7 = 67 inches. Then multiply by 2.54: 67 × 2.54 = 170.18 cm. Choose "ft + in" on either side of the converter to type feet and inches in separate boxes, or type 5'7" in the feet box.
How big is a 55-inch TV in cm?
A 55-inch TV is 55 × 2.54 = 139.7 cm. Screen sizes are measured corner to corner (diagonally), not across the width, so the TV itself is narrower than that. A 65-inch TV is 165.1 cm and a 27-inch monitor is 68.58 cm.
What is 1/16 of an inch in mm?
1/16 inch is 1.5875 mm, because 25.4 ÷ 16 = 1.5875. An eighth of an inch is 3.175 mm and a quarter inch is 6.35 mm. Pick a fraction like 1/16" under "Round to" to see inch answers as tape-measure fractions instead of decimals.
What size is A4 paper in inches?
A4 is 210 × 297 mm, which is about 8.27 × 11.69 inches. US Letter is 8.5 × 11 inches, which is 21.59 × 27.94 cm, so it is a little wider and shorter than A4. The paper size table on this page lists more sizes.
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