Inches to MM Converter
Instantly calculate! Your online conversion tool to easily convert inches to millimeters. Perfect for international measurements, engineering projects, woodworking, and everyday use. Simply enter your value and get accurate results immediately.
How to Convert Inches to MM
mm = inches × 25.4
1 inch = 25.4 mm
1 mm = 0.03937 inches
Example: convert 4 inches to mm:
4 inches = 4 × 25.4 = 101.6 mm
1 inch = 25.4 mm
1 mm = 0.03937 inches
Example: convert 4 inches to mm:
4 inches = 4 × 25.4 = 101.6 mm
Inches to MM
From inches to millimeters
25.4
1 in = 25.4 mm
Quick Conversion Table: Inches to MM
| Inches | MM |
|---|---|
| 1/16 | 1.588 |
| 1/8 | 3.175 |
| 1/4 | 6.35 |
| 3/8 | 9.525 |
| 1/2 | 12.7 |
| 5/8 | 15.875 |
| Inches | MM |
|---|---|
| 3/4 | 19.05 |
| 7/8 | 22.225 |
| 1 | 25.4 |
| 1.5 | 38.1 |
| 2 | 50.8 |
| 2.5 | 63.5 |
| Inches | MM |
|---|---|
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 6 | 152.4 |
| 10 | 254 |
| 12 | 304.8 |
| inches | mm | inches | mm | inches | mm | inches | mm |
|---|
About the Units
Inch (in)
An inch is a unit of length in the imperial and United States customary systems of measurement. It is defined as exactly 25.4 millimeters. The inch is commonly used in the United States, Canada, and the United Kingdom for everyday measurements, construction, and manufacturing.
Millimeter (mm)
A millimeter is a unit of length in the metric system, equal to one-thousandth of a meter (0.001 m). It is the standard unit for precise measurements in engineering, manufacturing, and scientific applications worldwide.
Frequently Asked Questions
How many mm is 1 inch?
1 inch is exactly equal to 25.4 millimeters.
How do I convert inches to mm?
To convert inches to millimeters, multiply the inch value by 25.4. For example, 2 inches = 2 × 25.4 = 50.8 mm.
What is the formula for inches to mm?
The formula is: millimeters = inches × 25.4.
How many inches is 1 mm?
1 mm equals approximately 0.03937 inches (or 1/25.4 of an inch).
What is 1/2 inch in mm?
1/2 inch (0.5 inches) equals 12.7 millimeters.
How to convert mm to inches?
To convert millimeters to inches, divide the mm value by 25.4. For example, 50 mm = 50 ÷ 25.4 = 1.969 inches.
Why is 1 inch equal to 25.4 mm?
In 1959, the inch was officially defined as exactly 25.4 millimeters by international agreement between the US, UK, and other countries to standardize measurements.
What is 1/4 inch in mm?
1/4 inch (0.25 inches) equals 6.35 millimeters.
What is 3/4 inch in mm?
3/4 inch (0.75 inches) equals 19.05 millimeters.
What is 6 inches in mm?
6 inches equals 152.4 millimeters.