semkuConvert inches to centimetres (cm)
Convert measurements, sets of dimensions or lists from inches to centimetres, and vice versa.
Conversion rules and supported formats
One inch is exactly 2.54 centimetres. To convert inches to centimetres, multiply by 2.54. To convert centimetres to inches, divide by 2.54.
Fractions are calculated without intermediate rounding. For example, 5 7/8 inches is 14.9225 cm. With four decimal places, the result is shown as 14.9225 cm; with two, it is shown as 14.92 cm.
Only the displayed result is rounded, to the selected number of decimal places. If the first discarded digit is 5 or greater, the last retained digit is increased by one. For example, 0.635 is shown as 0.64 to two decimal places. With no decimal places, 2.5 is shown as 3. Trailing zeros are kept.
“No rounding needed” means that the displayed result has not been rounded. Every value in a set must meet this condition. It does not mean that the accuracy of the original measurement has been checked. A small positive value may be displayed as zero after rounding.
You can enter whole numbers, decimals with a point, fractions and mixed numbers. These fraction characters are also supported, on their own or next to a whole number: ½, ⅓, ⅔, ¼, ¾, ⅕, ⅖, ⅗, ⅘, ⅙, ⅚, ⅛, ⅜, ⅝ and ⅞. For example, 5½ means five and a half.
Units are optional. For inches, use, for example, in, inch, inches, ", ″, pulgada, pulgadas or pulg. For centimetres, use, for example, cm, cms, centímetro, centímetros, centimetro or centimetros. Variants are also recognised: ” and two consecutive apostrophes ('') for inches, and a single full stop after units written as letters (in., pulg., cm.). Units are not case-sensitive, and spaces at the start and end of each measurement are ignored. Any unit you enter must match the selected conversion direction.
Separate up to three measurements with ×, x, X or *, or use the words by or por with spaces on either side. Each measurement is converted separately and stays in the same position. The × symbol between results does not indicate an area or volume calculation.
Negative numbers and mixed feet-and-inches measurements are not supported. The whole-number part of a measurement can contain up to 12 digits. Commas can separate thousands in the whole-number part: use one to three digits with no leading zero in the first group, then exactly three digits in each following group. For example, enter 1,234.5. Results are shown without thousands separators.
In “Multiple lines” mode, blank lines are skipped and the line numbering reflects the positions in the original text. An error on one line does not remove results for the others. The interpreted value is shown as a whole number or a fraction without rounding; the converted value uses the selected decimal places.
Conversion rules v1
Frequently asked questions
- How do I convert inches to centimetres?
- Multiply the measurement in inches by 2.54. For example, 12 inches is 30.48 cm. The conversion factor is exact.
- What is 5 7/8 inches in centimetres?
- 5 7/8 inches converts to 14.9225 cm. The default setting shows 14.92 cm, rounded to two decimal places. Choose four decimal places to show the value without rounding.
- Can I enter 5′8″ as a height?
- No. This notation combines feet and inches, which the converter does not support. Enter the full measurement in one unit and choose the matching direction. Do not replace 5′8″ with 5.8 inches; they are different measurements.
- Can I convert a list of product dimensions?
- Yes. Choose “Multiple lines” and enter one measurement or a set such as 12 × 8 on each line. The table keeps the original input, shows how each valid line was interpreted and marks any errors. Each dimension is converted separately; no area or volume is calculated.
- How do I convert centimetres back to inches?
- Choose “Centimetres → inches”. The converter divides the input by 2.54. For example, 25.4 cm is exactly 10 inches. One centimetre is approximately 0.393701 inches to six decimal places, so that displayed value is rounded.
- Does the converted size confirm that a screw or part will fit?
- No. A unit conversion does not check manufacturing tolerances, thread specifications or compatibility between parts. Check the product specifications for the intended use.
Privacy on this page
Calculations run in your browser. The measurements you enter are not sent to the server or saved in browser storage. Reloading the page returns the inputs to their initial state.
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For details, see the privacy policy.
Calculations run in your browser without sending your calculation inputs or results to the server. The conversion factor and rounding rule appear beside the result. See “Privacy on this page” for information about access data.