The specific number 2.5 is not equal to half an inch.
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12.7 millimetres
1.125
About one-half (0.531) inch.
1.27 centimeters1 inch = 2.54 centimeters half an inch:= 0.5 inch= 0.5 inch * 2.54 centimeters/1 inch= 1.27 centimeters
There are 25.4 millimetres in one inch. Therefore, half an inch is equal to 25.4 x 0.5 = 12.7 millimetres.