Introduction
Converting measurements from inch to mm (millimeters) is common in many fields like construction, engineering, and DIY projects. Whether you’re working with mm to inches, cm to mm, or mm to feet, knowing how to switch between units is helpful.
This guide will explain:
- How to convert inch to mm easily
- Simple mm to inches conversion
- Helpful charts for quick reference
- Common FAQs about measurement conversions
Why Convert Inch to mm?
Many countries use the metric system (mm, cm, meters), while others use inches and feet. If you work with international measurements, converting inch to mm is necessary.
For example:
- A screw size may be listed in inches, but your tool uses mm.
- A product’s dimensions may be in mm to in, and you need to understand the size.
Basic Inch to mm Conversion
The simplest way to convert inch to mm is by knowing:
1 inch = 25.4 mm
To convert:
- Multiply the inch value by 25.4
Example:
- 2 inches = 2 × 25.4 = 50.8 mm
Common Inch to mm Conversions
| Inches | Millimeters (mm) |
|---|---|
| 1/16″ | 1.5875 mm |
| 1/8″ | 3.175 mm |
| 1/4 inch to mm | 6.35 mm |
| 1/2″ | 12.7 mm |
| 1″ | 25.4 mm |
| 2″ | 50.8 mm |
How to Convert mm to Inches
If you need to convert mm to inches, divide the mm value by 25.4.
Formula:
mm ÷ 25.4 = inches
Example:
- 50 mm ÷ 25.4 = 1.9685 inches (≈ 2 inches)
Common mm to Inches Conversions
| Millimeters (mm) | Inches |
|---|---|
| 1 mm | 0.03937 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.3937 in |
| 20 mm | 0.7874 in |
| 50 mm | 1.9685 in |
Other Useful Conversions
1. cm to mm
- 1 cm = 10 mm
- Example: 5 cm = 50 mm
2. mm to feet
- 1 foot = 304.8 mm
- Example: 1000 mm = 3.2808 feet
3. Fractional Inches to mm
Many measurements use fractions (like 1/4 inch to mm). Here’s how to convert them:
- Convert the fraction to a decimal (1/4 = 0.25)
- Multiply by 25.4 (1/4 inch to mm = 6.35 mm)
Inch to mm Conversion Chart
For quick reference, here’s a full inch to mm chart:
| Inches | Millimeters (mm) |
|---|---|
| 1/16″ | 1.5875 mm |
| 1/8″ | 3.175 mm |
| 3/16″ | 4.7625 mm |
| 1/4 inch to mm | 6.35 mm |
| 5/16″ | 7.9375 mm |
| 3/8″ | 9.525 mm |
| 7/16″ | 11.1125 mm |
| 1/2″ | 12.7 mm |
| 9/16″ | 14.2875 mm |
| 5/8″ | 15.875 mm |
| 11/16″ | 17.4625 mm |
| 3/4″ | 19.05 mm |
| 13/16″ | 20.6375 mm |
| 7/8″ | 22.225 mm |
| 15/16″ | 23.8125 mm |
| 1″ | 25.4 mm |
FAQs About Inch to mm Conversion
1. How many mm in 1 inch?
- 1 inch = 25.4 mm
2. How to convert 1/4 inch to mm?
- 1/4 inch = 6.35 mm (Multiply 0.25 by 25.4)
3. Is 20 mm equal to 1 inch?
- No, 20 mm ≈ 0.787 inches (20 ÷ 25.4)
4. How do I convert mm to feet?
- Divide mm by 304.8 (since 1 foot = 304.8 mm)
5. What is 5 mm in inches?
- 5 mm ≈ 0.19685 inches
Conclusion
Converting inch to mm or mm to inches is simple once you know the basic formulas. Use the charts above for quick reference, and remember:
- 1 inch = 25.4 mm
- To convert mm to inches, divide by 25.4
Whether you’re working on a project or just need quick conversions, this guide makes it easy to switch between inches, mm, cm, and feet. Bookmark this page for future reference!
