Inches to Millimeters

Convert inches (in) to millimeters (mm) with formulas, examples, and conversion tables.

Inches (in)

Millimeters (mm)

1 in = 25.4 mm

Full precision:25.4 mm

Step-by-Step Solution

To convert 1 inches to millimeters, we multiply by 25.4 because one inch equals exactly 25.4 millimeters.

1 inch = 25.4 millimeters

Since each inch contains 25.4 millimeters, we multiply our value by this factor:

1 × 25.4 = 25.4 millimeters

So 1 inches = 25.4 millimeters.

✓Quick check: 25.4 ÷ 25.4 = 1 inches

How to Convert Inches to Millimeters

To convert inches to millimeters, multiply the value by 25.4.

Millimeters = Inches × 25.4

1 inch = 25.4 millimeters

Tip: To convert millimeters back to inches, divide by 25.4.

Example 1: 1 in = 25.4 mm
1 × 25.4 = 25.4

Example 2: 5 in = 127 mm
5 × 25.4 = 127

Example 3: 10 in = 254 mm
10 × 25.4 = 254