1/2 Inch to MM
Fractional inch to millimeters
1/2 inch (1/2β³)
12.7 mm
= 1.27 cm Β· 1 inch = 25.4 mm exactly
π‘ Commonly used for standard water pipe, most common size.
Nearby fractional inches
| Fraction | mm | cm |
|---|---|---|
| 3/8β³ | 9.525 mm | 0.9525 cm |
| 7/16β³ | 11.1125 mm | 1.1112 cm |
| 1/2β³ | 12.7 mm | 1.27 cm |
| 9/16β³ | 14.2875 mm | 1.4287 cm |
| 5/8β³ | 15.875 mm | 1.5875 cm |
Also written as
1/2 to mm Β· 1/2 in mm Β· 1/2" in mm Β· 1/2 inch in mm Β· 1/2 inches to millimeters Β· 1/2 en mm Β· 0.5 inch to mm
All of these mean the same measurement. The double-prime mark (β³) and the plain quote (") both stand for inches, and en mm is simply the French and Spanish wording of the same question.
Closest metric drill size
12.5 mm
1/2β³ = 12.7 mm Β· difference 0.2 mm
Metric drills step in 0.5 mm, so a fractional inch size rarely lands exactly on one. A 0.2 mm gap is usually invisible in a clearance hole but changes the fit on a press fit or a tapped hole.
FAQ
How many mm is 1/2 inch?
1/2 inch equals 12.7 mm. Since one inch is defined as exactly 25.4 mm, the result is 25.4 Γ 1 Γ· 2.
Why is the value exact?
The international yard and pound agreement of 1959 fixed the inch at exactly 25.4 mm, so fractional inch conversions terminate rather than repeat.
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