Inch to Millimeter

1 in = 25.4 mm

One inch equals 25.4 millimeters, and one millimeter equals 0.03937 inches.

Inch to Millimeter formula

mm = in × 25.4

To convert inches to millimeters, multiply the value by 25.4. One inch equals 25.4 millimeters.

Step-by-step examples

Convert 1 inches to millimeters

  1. 1Start with the value in inches: 1 in.
  2. 2Multiply by the conversion factor 25.4.
  3. 31 × 25.4 = 25.4 mm.

Result: 1 in = 25.4 mm

Convert 10 inches to millimeters

  1. 1Start with the value in inches: 10 in.
  2. 2Multiply by the conversion factor 25.4.
  3. 310 × 25.4 = 254 mm.

Result: 10 in = 254 mm

Convert 100 inches to millimeters

  1. 1Start with the value in inches: 100 in.
  2. 2Multiply by the conversion factor 25.4.
  3. 3100 × 25.4 = 2,540 mm.

Result: 100 in = 2,540 mm

Inch to Millimeter conversion table

Inch (in)Millimeter (mm)
0.010.254
0.12.54
0.512.7
125.4
250.8
376.2
4101.6
5127
10254
20508
25635
501,270
1002,540
2506,350
50012,700
100025,400

Inch to Millimeter chart

063.5127190.52540 in10 in

in (horizontal) vs mm (vertical)

Batch convert — paste multiple values

Related converters

Reverse: Millimeter to Inch

Frequently asked questions

How many millimeters are in a inch?

There are 25.4 millimeters in one inch (1 in = 25.4 mm).

How do you convert inches to millimeters?

To convert inches to millimeters, multiply the value by 25.4. One inch equals 25.4 millimeters.

What is 10 inches in millimeters?

10 inches equals 254 millimeters.

How many inches are in a millimeter?

One millimeter equals 0.03937 inches (1 mm = 0.03937 in).