- GuiCommand: Name:Fasteners ScrewCalculator MenuLocation:Fasteners → Screw calculator Workbenches:Fasteners
The 
Fasteners ScrewCalculator command shows a calculator to determine the tap hole size of screws.
The Screw hole calculator dialog box
- There are several ways to invoke the command:
- Press the
Fasteners ScrewCalculator button. - Select the Fasteners → Screw calculator option from the menu.
- Press the
- The Screw hole calculator dialog box opens.
- Specify the Fastener type and the Screw diameter.
- The Suggested hole diameter is displayed.
- The dialog box is modeless, meaning it can stay open while you continue working in FreeCAD.
- Press the Close button (provided by the OS) to close the dialog box.
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documentation index > [External Command Reference](Category_External Command Reference.md) > Fasteners > Fasteners ScrewCalculator