Inch (in)
An inch is a unit in US customary and imperial measure, standardized internationally as exactly 2.54 centimeters.
Inches dominate screen sizes, lumber dimensions, and everyday measuring tapes in the United States.
Inch to Centimeter
Convert inch to centimeter instantly. Type in either field — results update live.
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Length Inch Centimeter
1 inch = 2.54 centimeters
Unit
Unit
Conversion table
Selected in values converted to cm using the exact factor from this tool.
| in | cm |
|---|---|
| 0.01 | 0.0254 |
| 0.1 | 0.254 |
| 1 | 2.54 |
| 2 | 5.08 |
| 3 | 7.62 |
| 5 | 12.7 |
| 10 | 25.4 |
| 20 | 50.8 |
| 50 | 127 |
| 100 | 254 |
| 1,000 | 2,540 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 in = 2.54 cm
1 cm = 0.3937007874 in
To convert inch to centimeter, multiply by 2.54.
To convert centimeter to inch, multiply by 0.3937007874.
Example: convert 15 in to cm
15 × 2.54 = 38.1 cm
About these units
Short background on the units used in this conversion.
Centimeter (cm)
A centimeter is one hundredth of a meter, sitting between the millimeter and the meter on the metric scale.
Centimeters are common on rulers, in clothing and body measurements worldwide, and in school science labs.
Frequently asked questions
How many centimeters are in an inch?
One inch equals exactly 2.54 centimeters. Multiply any inch value by 2.54 to get centimeters.
What is the formula for inches to cm?
centimeters = inches × 2.54This uses the same exact definition as cm to inches, just reversed.
How do I convert 6 inches to cm?
Multiply 6 × 2.54 = 15.24 cm. Six inches is a common reference — about the length of a US dollar bill or a small tablet screen diagonal.
Why is the factor exactly 2.54?
In 1959, the inch was standardized internationally as 2.54 cm exactly, replacing older slightly different US and UK definitions. Modern converters all use this value.
All inch conversions
Jump to any length conversion starting from inch — including the reverse direction and every other unit in our dataset.
centimeter (cm) → inch (in)
inch (in) → kilometer (km)inch (in) → meter (m)inch (in) → decimeter (dm)inch (in) → millimeter (mm)inch (in) → micrometer (µm)inch (in) → nanometer (nm)inch (in) → mile (mi)inch (in) → yard (yd)inch (in) → foot (ft)inch (in) → light year (ly)inch (in) → exameter (Em)inch (in) → petameter (Pm)inch (in) → terameter (Tm)inch (in) → gigameter (Gm)inch (in) → megameter (Mm)inch (in) → hectometer (hm)inch (in) → dekameter (dam)inch (in) → micron (µ)inch (in) → picometer (pm)inch (in) → femtometer (fm)inch (in) → attometer (am)inch (in) → megaparsec (Mpc)inch (in) → kiloparsec (kpc)inch (in) → parsec (pc)inch (in) → astronomical unit (AU)inch (in) → league (lea)inch (in) → nautical league (uk)inch (in) → nautical league (int.)inch (in) → league (statute) (st.league)inch (in) → nautical mile (uk) (NM-UK)inch (in) → nautical mile (international) (nmi)inch (in) → mile (statute)inch (in) → mile (us survey)inch (in) → mile (roman) (mi-Roman)inch (in) → kiloyard (kyd)inch (in) → furlong (fur)inch (in) → furlong (us survey)inch (in) → chain (ch)inch (in) → chain (us survey)inch (in) → ropeinch (in) → rod (rd)inch (in) → rod (us survey)inch (in) → perchinch (in) → poleinch (in) → fathom (fath)inch (in) → fathom (us survey)inch (in) → ellinch (in) → foot (us survey)inch (in) → link (li)inch (in) → link (us survey)inch (in) → cubit (uk)inch (in) → handinch (in) → span (cloth)inch (in) → finger (cloth)inch (in) → nail (cloth)inch (in) → inch (us survey)inch (in) → barleycorninch (in) → milinch (in) → microinch (µin)inch (in) → angstrom (Å)inch (in) → a.u. of lengthinch (in) → x-unit (X)inch (in) → fermi (F)inch (in) → arpentinch (in) → picainch (in) → point (pt)inch (in) → twipinch (in) → alninch (in) → famninch (in) → caliber (cl)inch (in) → centiinch (cin)inch (in) → keninch (in) → russian archin (archin)inch (in) → roman actus (actus)inch (in) → vara de tareainch (in) → vara conuquerainch (in) → vara castellanainch (in) → cubit (greek)inch (in) → long reedinch (in) → reedinch (in) → long cubitinch (in) → handbreadthinch (in) → fingerbreadthinch (in) → planck lengthinch (in) → electron radius (classical) (re)inch (in) → bohr radius (b)inch (in) → earth's equatorial radius (R⊕eq)inch (in) → earth's polar radius (R⊕pol)inch (in) → earth's distance from suninch (in) → sun's radius