Clearance Hole Calculator

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Calculates the recommended clearance hole diameter for bolts and screws based on the bolt/screw size.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Bolt/Screw Size (Diameter) and Tolerance in the units shown.

Step 2

Read Clearance Hole Diameter in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Bolt/Screw Size (Diameter): 1/4 inch; Tolerance: Standard

Clearance Hole Diameter: 0.312 inches

Bolt/Screw Size (Diameter): 1/4 inch; Tolerance: Close

Clearance Hole Diameter: 0.293 inches

Bolt/Screw Size (Diameter): 1/2 inch; Tolerance: Standard

Clearance Hole Diameter: 0.574 inches

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