How many mm in an inch and a half? 1 1/2 inches = 38.1 mm. To make this calculation, we simply multiply: 25.4 × 1.5. Advertisements. Millimeters and inches...
Inch to mm (inches to millimeters) · 1 inch to mm = 25.4mm. 1 1/4 inch to mm = 31.75mm. 1 1/4 to mm = 31.75mm · 2 inches to mm = 50.8mm · 3 inches to mm = 76.2mm.
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