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 · 4 inches to mm = 101.6mm · 5 inches...
There are 31.75 millimeters in 1 1/4 inches. An inch (in.) is part of the US customary system of measurement, whereas a millimeter (mm.) is part of the SI...
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