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Fastener Calculators

Screw Size Calculator

Metric and imperial screw dimensions — major, minor and pitch diameters plus clearance holes.

Enter values

Results update as you type.

Result

Major diameter

6 mm

Pitch diameter
5.351 mm
Minor diameter
4.918 mm
Tap drill
5 mm
Clearance hole
6.4 mm
Stress area
20.12 mm²
In inches
0.2362

About the Screw Size Calculator

Metric and imperial screw dimensions — major, minor and pitch diameters plus clearance holes.

Also known as: screw dimensions, metric screw chart, screw gauge to mm, screw diameter.

How to use this calculator

  1. Enter screw size.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

minor diameter = D − 1.0825 × pitch

Worked example

Using the values pre-filled in the calculator above:

  • Screw size: M6

the calculator returns:

  • Major diameter: 6 mm
  • Pitch diameter: 5.351 mm
  • Minor diameter: 4.918 mm
  • Tap drill: 5 mm