I am assuming you mean millimeters.
One inch is exactly 2.54cm.
1cm=1000mm
2.54cm x 1000mm/cm = 2540mm
1in = 2540mm
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1 millimetre = 0.1 centimetres.
1 inch (2.54 centimeters/1 inch)(1 meter/100 centimeters) = 0.0254 meters in 1 inch ===================
1 inch=2.54 centimeters
1 inch = 2.54 centimeters
1 inch = 25.4 millimeters.