Convert Millimeters to Inches

Quickly convert from millimeters to inches using this conversion tool. You may also switch the units to convert from inches to millimeters.

Millimeters Value:

Conversion History

How to Use Our Converter?

To use the millimeters to inches converter, type the number you want to convert in the box. Click the "Convert" button, and the conversion result will appear below. You can try different values as many times as you like. All the conversions you made will be displayed in the Conversion History section.

Millimeters to Inches Conversion Table

Quick reference for converting millimeters to inches (up to 10 decimal places):

Millimeters	Inches
1 mm	0.0393700787 in
2 mm	0.0787401575 in
3 mm	0.1181102362 in
4 mm	0.1574803149 in
5 mm	0.1968503937 in
6 mm	0.2362204724 in
7 mm	0.2755905512 in
8 mm	0.3149606299 in
9 mm	0.3543307087 in
10 mm	0.3937007874 in
11 mm	0.4330708661 in
12 mm	0.4724409449 in
13 mm	0.5118110236 in
14 mm	0.5511811024 in
15 mm	0.5905511811 in
16 mm	0.6299212598 in
17 mm	0.6692913386 in
18 mm	0.7086614173 in
19 mm	0.7480314961 in
20 mm	0.7874015748 in
30 mm	1.1811023622 in
40 mm	1.5748031496 in
50 mm	1.9685039370 in
60 mm	2.3622047244 in
70 mm	2.7559055118 in
80 mm	3.1496062992 in
90 mm	3.5433070866 in
100 mm	3.9370078740 in

How to Convert Millimeters to Inches?

To convert millimeters (mm) to inches (in), you need to know the basic conversion. One inch is equal to 25.4 millimeters, so to find out how many inches a measurement in millimeters equals, you divide the number of millimeters by 25.4.

For example, if you have 50 millimeters and want to convert it to inches, you divide 50 by 25.4. The calculation is 50 ÷ 25.4 = 1.97 inches. Another example is 127 millimeters, which becomes 127 ÷ 25.4 = 5 inches. Using this method, you can easily find out how many inches are in any number of millimeters.

What is a Millimeter?

A millimeter (abbreviated as mm) is a very small unit of length in the metric system. One millimeter equals 1/1,000 of a meter or about 0.03937 inches. It is commonly used for measuring tiny objects like machine parts, paper thickness, or gaps in construction.

The history of the millimeter began in France in the late 18th century when the metric system was developed to provide a universal and easy-to-use system of measurement. The millimeter was introduced as a smaller unit of the meter for precise measurements. Today, it is widely used in engineering, manufacturing, science, and everyday life.

What is an Inch?

An inch (abbreviated as in or “) is a unit of length used primarily in the United States, Canada, and the United Kingdom. One inch equals 1/12 of a foot or exactly 2.54 centimeters. Inches are commonly used to measure small objects, such as screens, paper sizes, tools, and household items.

The history of the inch dates back to ancient times, when it was originally based on the width of a human thumb. In medieval England, an inch was later defined as the length of three barleycorns placed end to end. Over the centuries, the exact length varied between regions, causing inconsistencies. To standardize measurements internationally, in 1959 the inch was officially defined as 2.54 centimeters, making it a precise and globally recognized unit of length.