Convert Millimeters to Inches
1 Millimeter (mm) = 0.03937 Inches (in). Use the free converter below to instantly convert any millimeter value to inches, or view the full conversion table and formula.
1 mm = 0.03937 in
Millimeter to Inch Conversion Table
How to Convert Millimeters to Inches
To convert millimeters to inches, divide by 25.4. Since 1 inch = 25.4 mm exactly, this gives a precise result. For example, 50 mm ÷ 25.4 = 1.9685 inches. A quick mental shortcut: 25 mm ≈ 1 inch.
Worked Example: Convert 5 mm to in
Start with the value in millimeters
5 mm
Apply the formula
inches = 5 ÷ 25.4
Calculate the result
5 mm = 0.1969 in
Millimeter to Inch Examples
1 mm is equal to 0.0394 in. Using the formula mm ÷ 25.4, 1 mm converts to 0.0394 in.
2 mm is equal to 0.0787 in. Using the formula mm ÷ 25.4, 2 mm converts to 0.0787 in.
3 mm is equal to 0.1181 in. Using the formula mm ÷ 25.4, 3 mm converts to 0.1181 in.
5 mm is equal to 0.1969 in. Using the formula mm ÷ 25.4, 5 mm converts to 0.1969 in.
10 mm is equal to 0.3937 in. Using the formula mm ÷ 25.4, 10 mm converts to 0.3937 in.
15 mm is equal to 0.5906 in. Using the formula mm ÷ 25.4, 15 mm converts to 0.5906 in.
20 mm is equal to 0.7874 in. Using the formula mm ÷ 25.4, 20 mm converts to 0.7874 in.
25 mm is equal to 0.9843 in. Using the formula mm ÷ 25.4, 25 mm converts to 0.9843 in.
Converting Inches to Millimeters
Need the reverse conversion? Use the table below for a quick reference converting inches back to millimeters.
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 6 | 152.4 |
Millimeters to Inches FAQ
How many inches is 1 mm?
1 millimeter equals approximately 0.03937 inches. Since 1 inch is exactly 25.4 mm, you divide by 25.4.
What is 10 mm in inches?
10 mm equals approximately 0.3937 inches, which is just under 3/8 of an inch.
How are mm and inches related?
The international inch is defined as exactly 25.4 millimeters. This precise relationship makes mm-to-inch conversions exact when using this factor.
Understanding Millimeters and Inches
What is a Millimeter (mm)?
The millimeter (mm) is a unit of length in the metric system. It is commonly abbreviated as mm and relates to inches by a factor of 0.03937.
What is an Inch (in)?
The inch (in) is a unit of length in the imperial system. It is commonly abbreviated as in and relates to millimeters by a factor of 25.4.