What size is a Number 25 drill bit? (#25 drill bit size)

What size is a #25 drill bit?

Numbered drill bit gauge sizes range in ascending order from 80 (smallest) to 1 (largest). Thus, drill bit #25 is in the middle of your standard drill set. Here we will give you drill bit #25 in decimal inches, drill bit #25 in fractional inches, and drill bit #25 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 25 (#25).

We start by displaying drill bit Number 25 in decimal inches as follows:

#25 drill bit = 0.1495 inches

0.1495 decimal as a fraction is 299/2000. However, standard fractional drill bits come in intervals of 1/64 inches. Therefore, there are no standard fractional drill bits that are the exact 299/2000 fraction that the #25 drill bit is. To find the closest gauge wire #25 drill bit equivalent in fractional inches, we round 299/2000 up and down to 1/64 accuracy to get the following:

≈ 9/64 inches rounded down
#25 drill bit = 299/2000 inches
≈ 5/32 inches rounded up

Caution: Due to rounding, a 9/64 drill bit will make the hole smaller than a #25 drill bit and a 5/32 drill bit will make the hole larger than a #25 drill bit. Below we converted the fractions to decimals so you can compare more easily:

9/64 = 0.140625 inches
#25 = 0.1495 inches
5/32 = 0.15625 inches

There are 25.4 millimeters (mm) in an inch. Thus, to convert a #25 drill bit to millimeters, you simply multiply the decimal inches by 25.4 like so:

0.1495 inches x 25.4
= 3.7973 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.

Gauge Number Drill Bit Size
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