How to Convert Millimeters to Inches
Converting millimeters to inches is essential for anyone working with international measurements or switching between metric and imperial systems. One inch equals exactly 25.4 millimeters, making the conversion straightforward.
To convert millimeters to inches, simply divide the millimeter value by 25.4. For example, 100 mm / 25.4 = 3.937 inches. This conversion is commonly used in engineering, manufacturing, construction, and crafts where precision matters.
Understanding this conversion helps when reading technical specifications, working with tools calibrated in different units, or following international standards. Many industries use both systems, so being able to quickly convert between mm and inches is a valuable skill.
Quick Tips
- 1 mile = 1.609 km (miles are bigger)
- 1 kg = 2.205 lbs (roughly double + 10%)
- Temperature: (°F - 32) × 5/9 = °C
Frequently Asked Questions
1 millimeter equals approximately 0.03937 inches.
Divide the millimeter value by 25.4 to get inches.
By international agreement, 1 inch is defined as exactly 25.4 millimeters.
Yes, the conversion factor 25.4 is an exact definition, not an approximation.