Inches to Millimeters

Convert inches to millimeters instantly. 1 in = 25.4 mm

Result

254mm

10 in = 254 millimeters= 0 ft 10 inFormula: in × 25.4

Quick answers

Inches to Millimeters conversion table

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
15 in381 mm
Inches (in)Millimeters (mm)
20 in508 mm
25 in635 mm
30 in762 mm
40 in1,016 mm
50 in1,270 mm
75 in1,905 mm
100 in2,540 mm
250 in6,350 mm
500 in12,700 mm
1,000 in25,400 mm

Conversion formula

millimeters = inches × 25.4

Example: 10 in × 25.4 = 254 mm

An inch is exactly 2.54 centimeters, fixed by the 1959 international yard and pound agreement. A millimeter is one thousandth of a meter, about the thickness of a credit card.

You may also see this conversion written as “inches to mm”, “inches in mm” or “inches to millimetres”.

Questions

How many millimeters are in one inch?

One inch is 25.4 millimeters.

How do you convert inches to millimeters?

Multiply by 25.4. The factor comes from the exact definitions of both units, so the only rounding is in the display.

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