How Do You Convert Drill Bit Sizes?


Quick Answer

A conventional method to convert drill bit sizes is to use conversion charts that are available online. Most conversion charts have standard drill size listings with the different measurement systems used, such as wire gauge, fractional, letter and metric. These charts may also give tool diameters as decimals in millimeters and inches.

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How Do You Convert Drill Bit Sizes?
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Full Answer

The charts available online convert different drill bit sizes to equivalent systems. For example, a drill size that is given in fractional inches as 1/32, corresponds to a diameter that is 0.0313 inches or 0.7938 millimeters. Similarly, using a wire gauge size drill bit of #76 corresponds to diameters of 0.0200 inches or 0.5080 millimeters. Drill bit sizes may also be given in millimeters or letters. A drill bit with the letter A is related to a diameter of 0.2340 inches.

Drill bits are parts of drilling tools and are used for applications, such as metal machining and woodworking. Drill bits are available from manufacturers in a specific sets of sizes that are most commonly used in different industries. Two very common drill sizes are given in the fractional and wire gauge systems. The wire gauge bit sizes are available in a numbering system that ranges for #1 to #107. Drill bit sizes can also be found in a lettering system that ranges from A to Z. For drilling applications, an important factor is the drill diameter, which are generally given in either millimeters or inches.

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