mm to inch Converter – Millimeter to Inches Conversion
Convert millimetres to inches and inches to mm instantly. Type a value and get the result in real time. 1 inch = 25.4 mm exactly.
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Conversion Formula
1 inch = 25.4 mm (exact) mm to inches: inches = mm ÷ 25.4 inches to mm: mm = inches × 25.4
Quick Reference Table
1 mm
0.03937"
10 mm
0.3937"
25.4 mm
1.000"
50 mm
1.9685"
100 mm
3.9370"
300 mm
11.811"
Frequently Asked Questions
1 inch equals exactly 25.4 millimetres. This conversion factor is fixed and used universally in engineering and manufacturing.
India and most countries use the metric system (mm) for engineering, while the US uses imperial units (inches). When working with imported parts or US-based designs, conversion between the two is often necessary.