Introduction
In today’s globalized world, it is important to be able to accurately convert between different units of measurement. Two of the most common units are millimeters (mm) and inches (in). This guide will provide you with everything you need to know about converting between these two units, including formulas, tables, and tips.

How to Convert mm to inch
To convert millimeters (mm) to inches (in), you need to divide the mm measurement by 25.4. For example, 100 mm equals 100 mm / 25.4 = 3.937 in.
How to Convert Inches to mm
To convert inches (in) to millimeters (mm), you need to multiply the in measurement by 25.4. For example, 4 in equals 4 in x 25.4 = 101.6 mm.
Formulas for Converting mm to inch and inch to mm
Conversion | Formula |
---|---|
mm to inch | inch = mm / 25.4 |
inch to mm | mm = inch x 25.4 |
Tables for Converting mm to inch and inch to mm
The following tables provide conversions for common measurements in mm and inches.
mm | inch |
---|---|
1 | 0.03937 |
5 | 0.19685 |
10 | 0.39370 |
20 | 0.78740 |
30 | 1.18110 |
40 | 1.57480 |
50 | 1.96850 |
100 | 3.93700 |
inch | mm |
---|---|
0.1 | 2.54 |
0.5 | 12.7 |
1 | 25.4 |
2 | 50.8 |
3 | 76.2 |
4 | 101.6 |
5 | 127.0 |
10 | 254.0 |
Tips for Converting mm to inch and inch to mm
- When converting from mm to inch, it is helpful to remember that 1 inch is approximately equal to 25 mm.
- When converting from inch to mm, it is helpful to remember that 1 mm is approximately equal to 0.039 inch.
- Use a calculator to ensure accuracy when converting measurements.
- Double-check your conversions to avoid errors.
Applications of mm and inch
Mm and inch are used in a wide variety of applications, including:
- Engineering: Mm and inch are used to specify the dimensions of parts and components.
- Construction: Mm and inch are used to specify the dimensions of buildings and other structures.
- Manufacturing: Mm and inch are used to specify the dimensions of products and packaging.
- Science: Mm and inch are used to measure the size of objects and distances.
- Everyday life: Mm and inch are used to measure the size of clothing, furniture, and other objects.
Conclusion
By understanding how to convert between mm and inch, you can easily navigate the globalized world of measurements. This guide has provided you with the formulas, tables, and tips you need to convert mm to inch and inch to mm accurately and efficiently.