# 1 inch to mm

## 1 inch to mm conversion calculator

#### For fractions of an inch please select from the "x/y" options above

1in = 25.4mm

Note: You can increase or decrease the accuracy of this answer by selecting the number of significant figures required from the options above the result.

### Inches to Millimeters conversion formula

Millimeters = Inches * 25.4

### 1 Inches to Millimeters calculation

Millimeters = Inches * 25.4

Millimeters = 1 * 25.4

Millimeters = 25.4

## How to convert 1 Inches to Millimeters

Multiply the Inches value by the Inches to Millimeters conversion factor: 1 * 25.4 = 25.4

## What is an inch?

An inch is a length unit normally used in the United States and, occasionally, in the United Kingdom. It is defined as a twelth (1/12th) of a foot. The inch is normally subdivided into fractions of an inch such as the ½, ¼ and ⅛.

Historically, an inch was originally based on the width of a man's thumb. The inch is still commonly used in the United States for everyday measurements and worldwide for the size of TV and computer screens and clothing.

Inches are used in combination with other units of imperial measurement such as feet and yards. For example, a standard door in the United States a football field is 100 yards long or 300 feet or 3,600 inches.

## What is a millimeter?

A millimeter is a thousandth of a meter (1/1000) which is the SI (International System of Units) unit of length. It is normally used to measure small lengths like the thickness of a sheet of paper or the dimensions of a small object.

One millimeter is approximately equal to 0.03937 inches (about 1/25th). Presicely there are 25.4 millimeters in an inch and it is often used in science and engineering. It is used in countries that have adopted the metric system.

You may come across millimeters when measuring the size of electronic components, jewelry or even the thickness of a fingernail.

Starting value
Increment
Accuracy
Inches
Millimeters
0in
0.00000mm
1in
25.40000mm
2in
50.80000mm
3in
76.20000mm
4in
101.60000mm
5in
127.00000mm
6in
152.40000mm
7in
177.80000mm
8in
203.20000mm
9in
228.60000mm
10in
254.00000mm
11in
279.40000mm
12in
304.80000mm
13in
330.20000mm
14in
355.60000mm
15in
381.00000mm
16in
406.40000mm
17in
431.80000mm
18in
457.20000mm
19in
482.60000mm
Inches
Millimeters
20in
508.00000mm
21in
533.40000mm
22in
558.80000mm
23in
584.20000mm
24in
609.60000mm
25in
635.00000mm
26in
660.40000mm
27in
685.80000mm
28in
711.20000mm
29in
736.60000mm
30in
762.00000mm
31in
787.40000mm
32in
812.80000mm
33in
838.20000mm
34in
863.60000mm
35in
889.00000mm
36in
914.40000mm
37in
939.80000mm
38in
965.20000mm
39in
990.60000mm
Inches
Millimeters
40in
1,016.00000mm
41in
1,041.40000mm
42in
1,066.80000mm
43in
1,092.20000mm
44in
1,117.60000mm
45in
1,143.00000mm
46in
1,168.40000mm
47in
1,193.80000mm
48in
1,219.20000mm
49in
1,244.60000mm
50in
1,270.00000mm
51in
1,295.40000mm
52in
1,320.80000mm
53in
1,346.20000mm
54in
1,371.60000mm
55in
1,397.00000mm
56in
1,422.40000mm
57in
1,447.80000mm
58in
1,473.20000mm
59in
1,498.60000mm
Inches
Millimeters
60in
1,524.00000mm
61in
1,549.40000mm
62in
1,574.80000mm
63in
1,600.20000mm
64in
1,625.60000mm
65in
1,651.00000mm
66in
1,676.40000mm
67in
1,701.80000mm
68in
1,727.20000mm
69in
1,752.60000mm
70in
1,778.00000mm
71in
1,803.40000mm
72in
1,828.80000mm
73in
1,854.20000mm
74in
1,879.60000mm
75in
1,905.00000mm
76in
1,930.40000mm
77in
1,955.80000mm
78in
1,981.20000mm
79in
2,006.60000mm