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Inches to Millimeters

Convert inches (in) to millimeters (mm). Type in either box; the other updates as you go.

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1 in = 25.4 mm

1 inch equals25.4 mm
1 millimeter equals0.03937007874 in
Formulamm = in × 25.4

How to convert inches to millimeters

To convert inches to millimeters, multiply the number of inches by 25.4.

mm = in × 25.4

Example

Convert 5 inches to millimeters:

5 in × 25.4 = 127 mm

Inch to millimeter conversion chart

Inches (in)Millimeters (mm)
1 in25.4 mm
2 in50.8 mm
3 in76.2 mm
4 in101.6 mm
5 in127 mm
6 in152.4 mm
7 in177.8 mm
8 in203.2 mm
9 in228.6 mm
10 in254 mm
12 in304.8 mm
15 in381 mm
20 in508 mm
25 in635 mm
30 in762 mm
40 in1,016 mm
50 in1,270 mm
60 in1,524 mm
70 in1,778 mm
75 in1,905 mm
80 in2,032 mm
90 in2,286 mm
100 in2,540 mm
150 in3,810 mm
200 in5,080 mm
250 in6,350 mm
500 in12,700 mm
1,000 in25,400 mm

Going the other way? See the millimeters to inches chart.

Common inches to millimeters conversions

Each value has its own page with the working, the answer in other units and nearby values.

About the units

Inch (in)

An inch is exactly 2.54 centimeters, a value fixed by international agreement in 1959. There are 12 inches in a foot.

Millimeter (mm)

A millimeter is one thousandth of a meter. It is the unit on engineering drawings, rainfall gauges and the small marks of a metric ruler.

Frequently asked questions

How many millimeters are in an inch?

There are 25.4 millimeters in an inch.

How many inches are in a millimeter?

There are 0.03937007874 inches in a millimeter.

How do you convert inches to millimeters?

To convert inches to millimeters, multiply the number of inches by 25.4.

What is 5 inches in millimeters?

5 inches equals 127 millimeters.

Convert between metric and imperial units of length and distance, from millimeters to miles. Open the length converter to see a value in every unit at once.