Millimeters to Inches converter

Convert millimeters (mm) to inches (in). Exact factor: 1 mm = 0.03937007874015748 in.

Formula: in = mm × 0.03937007874015748

Quick examples

MillimetersInches
10.03937
50.19685
100.3937
200.7874
501.9685
1003.93701
2509.84252
50019.685

How to convert Millimeters to Inches

Formula: in = mm × 0.03937007874015748.

Reverse conversion: mm = in × 25.4

Tip: Use the swap button to reverse the calculation instantly.

Millimeters → Inches FAQs

What is the exact conversion factor?

Millimeters × 0.039370078740 = Inches.

How do I go the other way?

mm = in × 25.4

Are the results rounded?

Calculations use exact constants; values are displayed with sensible rounding for readability.