63/64 Inch to MM
Fractional inch to millimeters
63/64 inch (63/64β³)
25.003125 mm
= 2.500313 cm Β· 0.984375 inch decimal Β· 1 inch = 25.4 mm exactly
π‘ Standard fractional drill bit size. 1/64 in is also the finest graduation printed on a US tape measure.
Also written as
63/64 to mm Β· 63/64 in mm Β· 63/64" in mm Β· 63/64 inch in mm Β· 63/64 inches to millimeters Β· 63/64 en mm Β· 0.984375 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
25 mm
63/64β³ = 25.003125 mm Β· difference 0.0031 mm
Metric drills step in 0.5 mm, so a fractional inch size rarely lands exactly on one. A 0.0031 mm gap is usually invisible in a clearance hole but changes the fit on a press fit or a tapped hole.
Nearby fractional inches
| Fraction | mm | cm | Decimal |
|---|---|---|---|
| 61/64β³ | 24.209375 mm | 2.420937 cm | 0.953125β³ |
| 31/32β³ | 24.60625 mm | 2.460625 cm | 0.96875β³ |
| 63/64β³ | 25.003125 mm | 2.500313 cm | 0.984375β³ |
| 1/1β³ | 25.4 mm | 2.54 cm | 1β³ |
63/64β³ is 63/64 of an inch β the 63rd mark from zero on a tape measure graduated in sixty-fourths.
FAQ
How many mm is 63/64 inch?
63/64 inch equals 25.003125 mm. One inch is defined as exactly 25.4 mm, so the result is 25.4 Γ 63 Γ· 64.
What is 63/64 inch in decimal?
63/64 inch is 0.984375 inch in decimal, which is 25.003125 mm or 2.500313 cm.
Which metric size is closest to 63/64 inch?
25 mm is the closest common metric size, a difference of 0.0031 mm. Fractional-inch and metric fasteners are not interchangeable when the gap is more than about 0.2 mm.
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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