What size is a Number 64 drill bit? (#64 drill bit size)

What size is a #64 drill bit?

Numbered drill bit gauge sizes range in ascending order from 80 (smallest) to 1 (largest). Thus, drill bit #64 is on the smaller side of your standard drill set. Here we will give you drill bit #64 in decimal inches, drill bit #64 in fractional inches, and drill bit #64 in decimal millimeters (mm).

The purpose of this page is to give you an alternate drill bit (approximate equivalent) to drill bit gauge size Number 64 (#64).

We start by displaying drill bit Number 64 in decimal inches as follows:

#64 drill bit = 0.0360 inches

0.0360 decimal as a fraction is 9/250. However, standard fractional drill bits come in intervals of 1/64 inches. Therefore, there are no standard fractional drill bits that are the exact 9/250 fraction that the #64 drill bit is. To find the closest gauge wire #64 drill bit equivalent in fractional inches, we round 9/250 up and down to 1/64 accuracy to get the following:

≈ 1/32 inches rounded down
#64 drill bit = 9/250 inches
≈ 3/64 inches rounded up

Caution: Due to rounding, a 1/32 drill bit will make the hole smaller than a #64 drill bit and a 3/64 drill bit will make the hole larger than a #64 drill bit. Below we converted the fractions to decimals so you can compare more easily:

1/32 = 0.03125 inches
#64 = 0.0360 inches
3/64 = 0.046875 inches

There are 25.4 millimeters (mm) in an inch. Thus, to convert a #64 drill bit to millimeters, you simply multiply the decimal inches by 25.4 like so:

0.0360 inches x 25.4
= 0.9144 mm

Drill Bit Size Chart
For additional information about what drill bit to use, you may also want to take a look at the Drill Bit Size Chart which includes fractional inch drill bits, gauge wire drill bits, and metric drill bits sorted by size.

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