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Centimeters to Inches
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Centimeters to Inches — quick reference

1 cm = 0.3937 in
Common Centimeters to Inches conversions
cm in
1 cm 0.3937 in
2 cm 0.7874 in
3 cm 1.1811 in
5 cm 1.9685 in
10 cm 3.937 in
20 cm 7.874 in
25 cm 9.8425 in
50 cm 19.685 in
100 cm 39.3701 in
250 cm 98.4252 in
500 cm 196.8504 in
1000 cm 393.7008 in
// about this tool

Centimeters to Inches Online

Updated 2026-08-19

Convert centimeters to inches online for free. Enter a length in cm and SnapTools shows the exact value in inches instantly, in your browser — nothing is uploaded.

One centimetre is about 0.393701 inches, because an inch is exactly 2.54 cm — so you divide cm by 2.54. For quick reference: 1 cm ≈ 0.39 in, 5 cm ≈ 1.97 in, 10 cm ≈ 3.94 in, 30 cm ≈ 11.81 in, and 100 cm ≈ 39.37 in. Enter any value above for the precise figure, or use the full Length Converter for metres, feet, and more.

// how to use

  1. 1 Type a length in centimetres into the input.
  2. 2 SnapTools shows the value in inches instantly as you type.
  3. 3 Copy the result, or open the Length Converter for other units.

// examples

Screen or paper size
Input
30
Output
11.81102362
Round number
Input
10
Output
3.93700787

// common uses

Converting paper, screen, or fabric sizes to inches Reading metric measurements on a US-style ruler Following craft or sewing patterns across systems Checking a height or length quoted in cm

// faq

Is my input uploaded to a server?
No. The conversion runs entirely in your browser, so nothing you enter leaves your machine.
How many inches are in a centimetre?
One centimetre is about 0.393701 inches, because an inch is defined as exactly 2.54 centimetres. So you divide the cm value by 2.54 to get inches.
How do I convert cm to inches quickly?
Divide by 2.54, or as a rough estimate divide by 2.5. 30 cm is about 11.8 inches. This tool gives the exact value.
Why is the inch exactly 2.54 cm?
In 1959 the inch was internationally standardised as exactly 2.54 centimetres, which makes cm-to-inch conversions exact rather than approximate.
Can I convert screen or monitor sizes?
Yes. Screen sizes are measured diagonally, so enter the diagonal in centimetres to get inches — the figure manufacturers usually quote.

// works with your data

Inches to Centimeters Meters to Feet Kilometers to Miles Length Converter PX to REM Converter

Use this via API

Get a free API key → 
curl -X POST https://thesnaptools.com/api/v1/tools/cm-to-inches \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"value":"30"}'