How many centimeters are in 1 inch?

1 in equals 2.54 cm. The result uses the conversion definition recorded in the unit registry.

How do I convert inches to centimeters?

Multiply the value in in by the conversion factor. For example, 10 in = 25.4 cm. Use our calculator above for instant results.

Is the inches to centimeters conversion exact?

The registry marks both unit definitions as exact, so the mathematical factor is exact; displayed values may still be formatted for readability.

Can I convert inches to centimeters offline?

The calculation itself runs in the browser. An internet connection is recommended because the page and some resources may not already be cached.

What is the difference between inches and centimeters?

Inches (in) and Centimeters (cm) are both units of length but belong to different measurement systems. 1 in = 2.54 cm. Use the converter above to switch between them instantly.

Inches to Centimeters Converter

What it is

The international inch equals exactly 2.54 centimeters. 1 in = 2.54 cm; 1 cm ≈ 0.3937 in. The converter above uses this factor.

How to use

cm = inches × 2.54. Example: 1 in = 2.54 cm; 12 in = 30.48 cm; 36 in = 91.44 cm. Reverse: inches = cm ÷ 2.54.

cm = in × 2.54

Example: 1 in = 2.54 cm

Common uses

Screens, tires, pipe, sewing patterns, fabric widths (e.g. 45/60 in). Convert to cm when you need metric.

Conversion tips

Use exact 2.54, not 2.5. Conversion runs in your browser; nothing is uploaded. Cross-check with the table below.

in → cm Reference Table

in	cm
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
8 in	20.32 cm
10 in	25.4 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
60 in	152.4 cm

Calculated from factors marked exact in the unit registry.

Inches → Centimeters