I have been meaning to make my KiCad passive land pattern libraries compliant with the IPC-7531 industry standard.

The following is the IPC spreadsheet calculator I made for my own use (it’s been adapted to fit my needs):

Camilo RCL SMD CHIP IPC Calculator

note: this spreadsheet makes heavy use of the indirect function in Libre Office Calc

Also here are a couple of free calculators and resources you can find online to help you:

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