Inches to Millimeters
Convert Inches to Millimeters
"Inches to Millimeters" Calculator
How to Convert Inches to Millimeters
Inches to Millimeters Conversion Formula
To convert inches to millimeters, use this precise mathematical formula:
millimeters = inches × 25.4
Step-by-Step Guide for Inches to MM Conversion
- Take your measurement in inches (in or ″)
- Multiply by 25.4 (the exact number of millimeters in one inch)
- Get your result in millimeters (mm)
Common Inch to Millimeter Conversions
| Inches (″) | Millimeters (mm) | Common Use |
|---|---|---|
| 0.25″ | 6.35 mm | Drill bit size |
| 0.5″ | 12.7 mm | Socket wrench size |
| 1″ | 25.4 mm | Definition of inch |
| 2″ | 50.8 mm | Standard pipe diameter |
| 6″ | 152.4 mm | Ruler length |
| 12″ | 304.8 mm | 1 foot |
Practical Inches to MM Conversion Examples
Here are some real-world examples of inches to mm conversion:
- Half-inch pipe: 0.5 in × 25.4 = 12.7 mm
- Plywood thickness (3/4″): 0.75 in × 25.4 = 19.05 mm
- Smartphone screen: 6 in × 25.4 = 152.4 mm
- Laptop screen: 15 in × 25.4 = 381 mm
When You Need Inches to MM Conversion
Converting inches to millimeters is essential in:
- Engineering design and technical drawings
- Manufacturing and quality control processes
- Hardware and fastener specifications
- Medical measurements and diagnostics
- Electronics and precision instruments
- Jewelry making and watchmaking
Understanding Inches and Millimeters
Did you know? An inch was historically the width of an adult male's thumb, while a millimeter is one-thousandth of a meter.
The modern definition: 1 inch = 25.4 mm (exactly), established by international agreement in 1959 for precise conversion.
See Also
- Inches to Meters - Convert Inches to Meters
- Meters to Inches - Convert Meters to Inches
- Millimeters to Inches - Convert Millimeters to Inches
- Inches to Centimeters - Convert Inches to Centimeters
- Centimeters to Inches - Convert Centimeters to Inches
- Fractional Inches to Millimeters - Convert Fractional Inches to Millimeters
- Millimeters to Fractional Inches - Convert Millimeters to Fractional Inches
About "Inches to Millimeters" Calculator
This converter will help you to convert Inches to Millimeters (in to mm). For example, it can help you find out how many mm is 1 Inch? (The answer is: 25.4). Enter the number of inches (e.g. '1') and hit the 'Convert' button.
FAQ
How many mm is 1 inch?
One inch equals exactly 25.4 millimeters (1 in = 25.4 mm).
What is the formula to convert inches to mm?
To convert inches to millimeters, multiply the inch value by 25.4. For example, 12 inches × 25.4 = 304.8 mm.
How many inches are in a millimeter?
One millimeter equals approximately 0.0393701 inches — the reciprocal of the 25.4 mm-per-inch definition.