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Multiply inches by 25.4 to get millimeters.
So, 2.5i x 25.4 = 63.5mm

Notes:
1) Divide mm by 25.4 to get inches. 25.4mm = 1 inch.
2) Divide cm by 2.54 to get inches. 2.54cm = 1 inch.
3) This is the standard conversion factor. For more precision, I believe there is a very slightly different conversion factor (more decimal places).

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15y ago

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