How do I convert millimeters to inches?

Multiply the millimeter value by 0.0393701. So x mm × 0.0393701 = the equivalent in in.

What is 5 millimeters in inches?

5 millimeters equals 0.19685 inches.

What is 10 millimeters in inches?

10 millimeters equals 0.393701 inches.

What is 100 millimeters in inches?

100 millimeters equals 3.93701 inches.

How do I convert back from inches to millimeters?

Multiply the inch value by 25.4. For example, 1 in = 25.4 mm.

Is the millimeter bigger than the inch?

No. 1 millimeter is smaller than 1 inch. It takes 25.4 millimeters to equal 1 inch.

Are these conversion factors exact?

Yes. Since the 1959 international yard and pound agreement, imperial/US units are defined exactly in terms of metric units, so the factor used here (0.0393701) is exact within IEEE 754 double precision.

Millimeters to Inches Converter

1 mm = 0.0393701 in

1 millimeter equals 0.0393701 inches. To convert millimeters to inches, multiply the millimeter value by 0.0393701. For quick reference: 1 mm = 0.0393701 in, 5 mm = 0.19685 in, 10 mm = 0.393701 in, 100 mm = 3.93701 in.

From

0.0393701

FormulaInches = Millimeters × 0.0393701

Quick

How to convert millimeters to inches

Take your value
Start with your value in millimeters.
Multiply by 0.0393701
Multiply the millimeter value by 0.0393701. This is the exact conversion factor from millimeters to inches.
Read the result
The product is your value in inches. For example, 5 mm × 0.0393701 = 0.19685 in.

Conversion formula

The exact factor from millimeters to inches is 0.0393701.

Inches = Millimeters × 0.0393701

Millimeters to Inches conversion table

Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.

Conversion table from millimeters to inches
Millimeters (mm)	Inches (in)
0.1 mm	0.003937 in
0.25 mm	0.0098425 in
0.5 mm	0.019685 in
1 mm	0.03937 in
2 mm	0.07874 in
3 mm	0.11811 in
4 mm	0.15748 in
5 mm	0.19685 in
6 mm	0.23622 in
7 mm	0.27559 in
8 mm	0.31496 in
9 mm	0.35433 in
10 mm	0.3937 in
11 mm	0.43307 in
12 mm	0.47244 in
13 mm	0.51181 in
14 mm	0.55118 in
15 mm	0.59055 in
16 mm	0.62992 in
18 mm	0.70866 in
20 mm	0.7874 in
22 mm	0.86614 in
24 mm	0.94488 in
25 mm	0.98425 in
28 mm	1.1024 in
30 mm	1.1811 in
32 mm	1.2598 in
36 mm	1.4173 in
40 mm	1.5748 in
45 mm	1.7717 in
48 mm	1.8898 in
50 mm	1.9685 in
60 mm	2.3622 in
70 mm	2.7559 in
75 mm	2.9528 in
80 mm	3.1496 in
90 mm	3.5433 in
100 mm	3.937 in
125 mm	4.9213 in
150 mm	5.9055 in
200 mm	7.874 in
250 mm	9.8425 in
300 mm	11.811 in
400 mm	15.748 in
500 mm	19.685 in
600 mm	23.622 in
750 mm	29.528 in
800 mm	31.496 in
900 mm	35.433 in
1000 mm	39.37 in

Real-world reference

A credit card is about 0.76 mm thick. Standard A4 paper is 0.1 mm thick. A pencil lead is around 2 mm in diameter. In inches, that gives you: 1 mm = 0.0393701 in, 10 mm = 0.393701 in, 100 mm = 3.93701 in.

Frequently asked questions

How many inches are in 1 millimeter?: 1 millimeter equals 0.0393701 inches.
How do I convert millimeters to inches?: Multiply the millimeter value by 0.0393701. So x mm × 0.0393701 = the equivalent in in.
What is 5 millimeters in inches?: 5 millimeters equals 0.19685 inches.
What is 10 millimeters in inches?: 10 millimeters equals 0.393701 inches.
What is 100 millimeters in inches?: 100 millimeters equals 3.93701 inches.
How do I convert back from inches to millimeters?: Multiply the inch value by 25.4. For example, 1 in = 25.4 mm.
Is the millimeter bigger than the inch?: No. 1 millimeter is smaller than 1 inch. It takes 25.4 millimeters to equal 1 inch.
Are these conversion factors exact?: Yes. Since the 1959 international yard and pound agreement, imperial/US units are defined exactly in terms of metric units, so the factor used here (0.0393701) is exact within IEEE 754 double precision.

About the millimeter and the inch

The millimeter

The millimeter (mm) is a metric unit of length equal to one-thousandth of a meter. It is the working unit of engineering drawings, precision manufacturing, electronics, and most consumer-goods specifications outside the United States. A credit card is about 0.76 mm thick; the diameter of a pencil lead is around 2 mm.

The inch

The inch (in) is a unit of length in the imperial and US customary systems, defined as exactly 25.4 millimeters since the 1959 international yard and pound agreement. It is the standard unit in the US for screen sizes, lumber, fasteners, and personal height when given in feet-and-inches form. Twelve inches make one foot.

Inches to Millimeters

in → mm

Millimeters to Centimeters

mm → cm

Millimeters to Meters

mm → m

Millimeters to Kilometers