Half Inch to mm – 1/2 Inch in Millimetres
1/2 inch = {formatNumber(MM, 4)} mm
One inch is defined internationally as exactly{' '} 25.4 millimetres . To convert a fraction of an inch to millimetres, first turn the fraction into a decimal, then multiply by 25.4:
Millimetre equivalents for common fractions of an inch:
Inches to millimetres converter (fractions supported)
How the calculation works
Fractional inches close to 1/2
Frequently asked questions
More inches to millimetres conversions
What is half an inch in millimetres?
Half an inch is 12.7 millimetres. Because 1 inch = 25.4 mm exactly, half an inch is 25.4 ÷ 2 = 12.7 mm.
What is 1/2 inch in mm?
1/2 inch equals 12.7 mm. The fraction 1/2 is 0.5 as a decimal, and 0.5 × 25.4 = 12.7 mm.
Is 0.5 inch the same as 12.7 mm?
Yes. 0.5 inch, 1/2 inch and "half an inch" all describe the same length, which converts to exactly 12.7 millimetres.
How do you convert half inch to mm?
Multiply 0.5 by 25.4 (the number of millimetres in one inch). The calculation is 0.5 × 25.4 = 12.7 mm. The calculator on this page handles any fraction or decimal the same way.
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