Millimeters to Inches Calculator



Inches (fraction):



Use this calculator to convert a distance in millimeters to inches. When you enter a distance, the calculator will immediately display its equivalent in inches, both as decimals and fractions.

Below you will find additional information on using the calculator and on the relationship between millimeters and inches. In addition, you can find a table of useful values in millimeters and inches.

How to use the calculator from millimeters to inches?

Step 1: Enter the distance in millimeters in the “Millimeters” input box. You can use any real value.

Step 2: The number of inches in decimal will be displayed on the right side.

Step 3: The number of inches in fractions, the number of feet + inches, and the process used to convert to inches will be displayed at the bottom in the additional boxes.

How many millimeters are there in an inch?

1 inch contains 25.4 millimeters. Alternatively, 1 millimeter is equivalent to 0.03937 inches.

Millimeters and inches belong to different unit systems. Millimeters are units of distance in the Metric System, and inches are units of distance in the Imperial System.

The symbol used to represent millimeters is mm. On the other hand, the symbol used to represent inches is in or also β€³.

Inches can be represented both in decimal form and in fractions, where the denominator is a power of 2. For example, the most common fractions are 1/2, 1/4, 1/8, 1/16, 1/ 32, and 1/64.

How to convert from millimeters to inches?

To transform from millimeters to inches, we can divide the distance in millimeters by 25.4. Therefore, if we have a distance d in millimeters (mm), we divide it by 25.4 to get the inches.

d(in) = d(mm)/25.4

Example 1:

Convert 100 millimeters to inches.

We have to divide the number of millimeters by 25.4. Therefore, we have:

d(in) = 100/25.4

d(in) = 3.937 in

Example 2:

How many inches equals 500 millimeters?

To find the number of inches, we divide by 25.4, and we have

d(in) = 500/25.4

d(in) = 19.685 in

Example 3:

Convert 5 millimeters to inches.

If we divide the millimeters by 25.4, we have:

d(in) = 5/25.4

d(in) = 0.19685 in

Millimeters to inches table

Millimeters (mm)Inches decimal (β€³)Inches fraction(β€³)
0.1 mm0.0039 β€³0 β€³
1 mm0.0394 β€³3/64 β€³
2 mm0.0787 β€³5/64 β€³
3 mm0.1181 β€³1/8 β€³
4 mm0.1575 β€³5/32 β€³
5 mm0.1969 β€³13/64 β€³
6 mm0.2362 β€³15/64 β€³
7 mm0.2756 β€³9/32 β€³
8 mm0.3150 β€³5/16 β€³
9 mm0.3543 β€³23/64 β€³
10 mm0.3937 β€³25/64 β€³
20 mm0.7874 β€³25/32 β€³
30 mm1.1811 β€³1 3/16 β€³
40 mm1.5784 β€³1 37/64 β€³
50 mm1.9685 β€³1 31/32 β€³
60 mm2.3622 β€³2 23/64 β€³
70 mm2.7559 β€³2 3/4 β€³
80 mm3.1496 β€³3 5/32 β€³
90 mm3.5433 β€³3 35/64 β€³
100 mm3.9370 β€³3 15/16 β€³
1000 mm39.3701 β€³39 3/8 β€³

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