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Inches to Centimetres

1 inch = 2.54 centimetres · 1 cm = 0.3937 in

1 inch = 2.54 centimetres

How it’s calculated

cm = in × 2.54

  • Multiply the value in inches by 2.54.
  • To go back, divide by 2.54 (or multiply by 0.3937007874).
  • 1 in = 2.54 cm · 1 cm = 0.3937007874 in
Show worked solutionFactor, unit cancellation and rounding, step by step

  1. Find the conversion factor

    By definition 1 in = 0.0254 m and 1 cm = 0.01 m, so 1 in = 2.54 cm. Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.).

  2. Multiply by the factor written as a fraction

    Put in in the denominator so it cancels, leaving cm.

  3. Calculate (unrounded)

  4. Round the answer

    Rounded to 5 significant figures.

Answer: 2.54 cm

1 in in other units

Batch convert in → cm
Results
  1. 1 in = 2.54 cm
  2. 5 in = 12.7 cm
  3. 10 in = 25.4 cm
  4. 25 in = 63.5 cm

Permanent link to this conversion

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Quick examples

  • 1 inch = 2.54 centimetres
  • 5 inches = 12.7 centimetres
  • 10 inches = 25.4 centimetres
  • 25 inches = 63.5 centimetres
  • 100 inches = 254 centimetres

About these units

Inch (in)

US & imperial (identical)

Exactly 2.54 cm (international inch, 1959).

1 in = 0.0254 m

Source: NIST SP 811 / Handbook 44

Centimetre (cm)

SI (metric)

Exactly 1/100 of a metre.

1 cm = 0.01 m

Source: BIPM SI Brochure (9th ed.)

Inches to centimetres conversion table

inch (in) to centimetre (cm)
Inches (in)Centimetres (cm)
0.1 in0.254 cm
0.5 in1.27 cm
1 in2.54 cm
2 in5.08 cm
3 in7.62 cm
4 in10.16 cm
5 in12.7 cm
6 in15.24 cm
7 in17.78 cm
8 in20.32 cm
9 in22.86 cm
10 in25.4 cm
15 in38.1 cm
20 in50.8 cm
25 in63.5 cm
30 in76.2 cm
40 in101.6 cm
50 in127 cm
75 in190.5 cm
100 in254 cm
250 in635 cm
500 in1,270 cm
1,000 in2,540 cm

Related conversions

Frequently asked questions

How do I convert inches to centimetres?

Use cm = in × 2.54. Multiply the value in inches by 2.54.

How many centimetres are in 1 inch?

1 inch (in) equals 2.54 centimetres (cm).

How many inches are in 1 centimetre?

1 centimetre (cm) equals 0.3937 inches (in); more precisely 0.3937007874.

What is 10 in in cm?

10 inches = 25.4 centimetres.

What is a inch?

Exactly 2.54 cm (international inch, 1959).

What is a centimetre?

Exactly 1/100 of a metre.

Formula: cm = in × 2.54. Factors last reviewed 2026-10-27.