Drill Bit Size Chart

Mastering DIY projects starts with choosing the right tools, and a drill is a must-have. This guide simplifies the process of selecting drill bit sizes, perfect for beginners. Learn how to understand measurements and utilize a drill bit size chart effectively for successful project.

Drill Bit Size Chart:

Fractional Inch Decimal Inch Millimeters (mm)
1/16 0.0625 1.5875
5/64 0.0781 1.9844
3/32 0.0938 2.3813
7/64 0.1094 2.7781
1/8 0.125 3.175
9/64 0.1406 3.5719
5/32 0.1563 3.9688
11/64 0.1719 4.3656
3/16 0.1875 4.7625
13/64 0.2031 5.1594
7/32 0.2188 5.5563
15/64 0.2344 5.9531
1/4 0.25 6.35
17/64 0.2656 6.7469
9/32 0.2813 7.1438
19/64 0.2969 7.5406
5/16 0.3125 7.9375
21/64 0.3281 8.3344
11/32 0.3438 8.7313
23/64 0.3594 9.1281
3/8 0.375 9.525
25/64 0.3906 9.9219
13/32 0.4063 10.3188
27/64 0.4219 10.7156
7/16 0.4375 11.1125
29/64 0.4531 11.5094
15/32 0.4688 11.9063
31/64 0.4844 12.3031
1/2 0.5 12.7

Understanding Drill Bit Measurements

Before we dive into the drill bit size chart, it’s crucial to understand how drill bit measurements work. Drill bit sizes are typically measured in inches, but they can also be measured in millimeters (mm) or fractional inches.

The drill bit size refers to the diameter of the bit itself. For example, a 1/4-inch drill bit has a diameter of 1/4 inch. It’s important to note that as the drill bit size increases, the hole it creates will also be larger.


The Drill Bit Size Chart

Now that you have grasped the basics, let’s explore the drill bit size chart. The chart categorizes drill bit sizes based on their diameter, allowing you to choose the perfect drill bit for your project. Below is a comprehensive drill bit size chart depicting sizes in inches and millimeters:

More rows can be added here

Remember, this is just a small portion of the drill bit size chart. It’s essential to consult a full chart to access all available sizes. Having access to a complete drill bit size chart will save you time and make your DIY projects much more efficient.

Using the Drill Bit Size Chart Effectively

Now that you have a drill bit size chart at your disposal, let’s discuss how to use it effectively.

  1. Identify your project requirements: Determine the type and size of hole you need to create. Assess the material you’ll be working with, as different materials may require specific drill bit sizes.
  2. Refer to the drill bit size chart: Locate the drill bit size that matches the hole size you need. Remember, it’s always better to choose a slightly smaller drill bit and widen the hole if necessary, rather than selecting a larger drill bit and compromising the project’s integrity.
  3. Consider the drill bit materials: Different drill bit materials can handle specific tasks better. For example, high-speed steel (HSS) drill bits are suitable for most general-purpose drilling, while cobalt drill bits are better for drilling into harder materials like stainless steel.
  4. Don’t forget about the shank size: Alongside the drill bit size, you should also consider the shank size. The shank is the non-cutting end of the drill bit that fits into the drill’s chuck. Ensure your chosen drill bit has a compatible shank size with your drill.
Drill Bit Size Chart: The Ultimate Guide to Perfect Drilling


What Drill Bit Size Should I Use For A Pilot Hole?

To create a pilot hole, it’s best to use a drill bit that is slightly smaller than the diameter of the screw you’ll be using.

Is There A Standard Size For Drill Bits?

Yes, drill bits come in standard sizes, usually ranging from 1/16 to 1 inch. However, specialty bits can exceed these sizes.

What Size Drill Bit Do I Need For A Wall Anchor?

For most wall anchors, a 3/16-inch drill bit will work. However, it’s always best to check the specific anchor’s instructions for the recommended bit size.


Drill bit sizes are vital to selecting the right tools for your DIY projects. By understanding drill bit measurements and utilizing a drill bit size chart, you can effectively choose the perfect drill bit to achieve your desired hole size. Remember to consider your project requirements, drill bit materials, and shank size for optimal results.

Now that you’re equipped with this comprehensive guide and a handy drill bit size chart, you can confidently tackle your DIY projects with ease. So go ahead, measure twice, drill once!

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