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Clearance Hole Calculator

Look up close, normal and loose metric bolt clearance-hole sizes.

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Interactive calculation

Enter your values

Calculated result

This is a general planning estimate. Check units and verify critical results independently.

Why this result needs checking

Engineering results depend on inputs, assumptions and real-world conditions. Use this as a planning/checking value and verify critical work against manufacturer data, drawings or applicable standards. How our calculations work →

How to use it

Use consistent units and realistic inputs.

Look up close, normal and loose metric bolt clearance-hole sizes. Enter the requested values, calculate the result, then compare it with drawings, catalogues, standards or manufacturer information relevant to the job.

Common mistakes

  • Using a tapping drill size as a clearance hole
  • Forgetting coating or alignment tolerances
  • Selecting a close fit where assembly access is poor

Frequently asked questions

What does this calculator calculate?

Look up close, normal and loose metric bolt clearance-hole sizes.

Is the answer exact?

No. The formula provides an engineering estimate based on the inputs and assumptions shown. Real systems can include tolerances, friction, losses, material variation and regulatory requirements.

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