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 |
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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