Convert 1/4 inches to millimeters
"Fractional Inches to Millimeters" Calculator
How many millimeters in 1/4 inches?
Answer
1/4″ = 6.35 mm
= 0.25″ · decimal inches
Exact: 1″ = 25.4 mm by definition (1959), and a ruler fraction converts without rounding. If the thread is marked G 1/4 (BSPP), its basic outside diameter is 13.157 mm (ISO 228-1): the inch size of a pipe thread is nominal.
1 ÷ 4 = 0.25; 0.25 × 25.4 = 6.35 mm
Neighbouring sizes
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