Drill Bit Size Conversions

Convert drill bit sizes between fractional inches, decimal inches, mm, letter (A-Z), and number (#1-#80).
Find the right bit for clearance and tap holes.

Drill Bit Size Converter

Convert drill bit sizes between fractional inches, decimal inches, mm, letter (A-Z), and number gauges (1-80). Full cross-reference chart for metalworking.

Embed This Calculator

Copy the code below and paste it into your website or blog.
The calculator will work directly on your page.