Inches to Millimeters

Convert Inches to Millimeters. 1 in equals 25.4 mm. Type a value on either side; the formula and tables below show how it works.

in
mm
1 Inches equals
25.4mm

Formula: mm = in × 25.4. Example: 5 in = 127 mm.

1 Inches in every unit

Millimeters25.4 mm
Centimeters2.54 cm
Meters0.0254 m
Kilometers0.0000254 km
Feet0.083333 ft
Yards0.027778 yd
Miles0.000015783 mi
Nautical Miles0.000013715 nmi

Inches to Millimeters table

InchesMillimeters
0.1 in2.54 mm
0.25 in6.35 mm
0.5 in12.7 mm
1 in25.4 mm
2 in50.8 mm
3 in76.2 mm
4 in101.6 mm
5 in127 mm
10 in254 mm
15 in381 mm
20 in508 mm
25 in635 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
MillimetersInches
0.1 mm0.003937 in
0.25 mm0.009843 in
0.5 mm0.019685 in
1 mm0.03937 in
2 mm0.07874 in
3 mm0.11811 in
4 mm0.15748 in
5 mm0.19685 in
10 mm0.393701 in
15 mm0.590551 in
20 mm0.787402 in
25 mm0.984252 in
50 mm1.9685 in
75 mm2.9528 in
100 mm3.937 in
250 mm9.8425 in
500 mm19.685 in
1,000 mm39.3701 in

How to convert inches to millimeters

mm = in × 25.4

Multiply the value in inches by 25.4. To go the other way, divide by the same number, or multiply by 0.03937. For example, 5 in × 25.4 = 127 mm.

About the units

Inches (in). Exactly 2.54 centimeters since the 1959 international yard agreement. Screens, tools and US and UK body measurements.

Millimeters (mm). One thousandth of a meter. Used for small parts, rainfall and engineering drawings.

Other length conversions

Millimeters to Centimeters · Millimeters to Meters · Millimeters to Kilometers · Millimeters to Inches · Millimeters to Feet · Millimeters to Yards · Millimeters to Miles · Millimeters to Nautical Miles · Centimeters to Millimeters · Meters to Millimeters · Kilometers to Millimeters · Inches to Millimeters · Inches to Centimeters · Inches to Meters · Inches to Kilometers · Inches to Feet · Inches to Yards · Inches to Miles · Inches to Nautical Miles · Feet to Millimeters · Yards to Millimeters · Miles to Millimeters · Nautical Miles to Millimeters

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