Gauge Number Drill Bit Size

Numbered drill bit gauge sizes range in ascending order from 80 (smallest) to 1 (largest). Here you can enter a gauge wire number and we will give you its size in decimal inches, fractional inches, and in decimal millimeter (mm).

Please submit your drill bit number in the box below and press "Drill Bit Size" to get information about your drill bit.

Here are some examples of what this tool can answer:

What size is a Number 1 drill bit?

What size is a Number 3 drill bit?

What size is a Number 29 drill bit?

What size is a Number 21 drill bit?

What size is a Number 10 drill bit?

What size is a Number 30 drill bit?

What size is a Number 7 drill bit?