🧮 Study tools

Inches to Millimetres converter

Type a value to convert inches to millimetres instantly. This free converter shows the formula and a quick reference table, and the box works both ways — edit either side.

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1 in = 25.4 mm · Open the full converter →

🎁 100% free · no sign-up · works offline.

📐 The formula

How to convert inches to millimetres

To convert inches to millimetres, multiply the inche value by 25.4. So millimetres = inches × 25.4. For example, 6 in = 152.4 mm. To go the other way, divide by the same number.

📊 Conversion table

Inches → Millimetres at a glance

Inches (in)Millimetres (mm)
1 in25.4 mm
2 in50.8 mm
5 in127 mm
6 in152.4 mm
10 in254 mm
12 in304.8 mm
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