Convert 1 1/2 inches to millimeters
"Fractional Inches to Millimeters" Calculator
How many millimeters in 1 1/2 inches?
Answer
1 1/2″ = 38.1 mm
= 1.5″ · decimal inches
Exact: 1″ = 25.4 mm by definition (1959), and a ruler fraction converts without rounding. If the thread is marked G 1 1/2 (BSPP), its basic outside diameter is 47.803 mm (ISO 228-1): the inch size of a pipe thread is nominal.
1 1/2″ = 3/2″; 3 ÷ 2 = 1.5; 1.5 × 25.4 = 38.1 mm
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