mm to Inches Converter: Formula and Conversion Table

millimeters mm inches in

1 mm = 0.03937007874 in

Formula

in = mm ÷ 25.4

How to convert

To convert millimeters to inches, divide the value by 25.4. For example, 2 mm = 0.07874015748 in.

Conversion table

mm	Inches (in)
1 mm	0.03937007874 in
2 mm	0.07874015748 in
3 mm	0.1181102362 in
5 mm	0.1968503937 in
6 mm	0.2362204724 in
8 mm	0.3149606299 in
10 mm	0.3937007874 in
12 mm	0.4724409449 in
15 mm	0.5905511811 in
20 mm	0.7874015748 in
25 mm	0.9842519685 in
50 mm	1.968503937 in
100 mm	3.937007874 in

About these units

Metric lengths step by powers of ten: 10 mm = 1 cm, 100 cm = 1 m and 1,000 m = 1 km. Imperial and US customary lengths have been defined exactly in metric since 1959: 1 inch = 2.54 cm, 1 foot = 12 inches = 30.48 cm, 1 yard = 3 feet = 0.9144 m and 1 mile = 1,760 yards = 1,609.344 m. Because these definitions are exact, the conversions on this page are exact up to rounding.

FAQ

› How do I convert mm to in?

1 mm = 0.03937007874 in. To convert, divide the value by 25.4: 2 mm = 0.07874015748 in.

› What is 1 in in mm?

1 in = 25.4 mm. The reverse formula is mm = in × 25.4.

› How many centimeters are in an inch?

Exactly 2.54 cm. The international inch has been defined this way since 1959.

› How do I convert a height in feet and inches?

Multiply the feet by 30.48 and the inches by 2.54, then add them: 5 ft 10 in = 152.4 + 25.4 = 177.8 cm.