Question 1

How do I convert mm to inches?

Accepted Answer

To convert millimeters to inches, divide the millimeter value by 25.4. For example: 10 mm ÷ 25.4 = 0.3937 inches. This uses the exact conversion factor where 1 inch equals 25.4 millimeters.

Question 2

What is the formula for mm to inches conversion?

Accepted Answer

The formula is: inches = millimeters ÷ 25.4. For the reverse conversion (inches to mm), use: millimeters = inches × 25.4. The factor 25.4 is the internationally accepted standard.

Question 3

How many mm in an inch?

Accepted Answer

There are exactly 25.4 millimeters in 1 inch. This is the international standard conversion factor used worldwide for engineering, manufacturing, and technical applications.

Question 4

How to convert mm to fractional inches for woodworking?

Accepted Answer

First convert mm to decimal inches (divide by 25.4), then round to the nearest fraction. Use a fractional inches tool to select your preferred precision (1/8", 1/16", or 1/32") matching your measuring tools.

Question 5

Is this converter accurate for engineering purposes?

Accepted Answer

Yes, this converter uses the exact standard conversion factor (1 inch = 25.4 mm) and supports precision up to 6 decimal places. The internal calculation maintains high precision, suitable for engineering, manufacturing, and technical documentation.