I’ve just updated the Plaster Calculator with a slightly improved UI and clearer ability to change units. I’m also recommending that people use @earlyamericanrobotpottery‘s formula, so I’ve listed it first. In my experience, Keith’s formula is both simple and accurate.
Tip of the Day: You can add links to Glazy and Plaster Calculator directly on your phone’s home screen!
https://plaster.glazy.org (link in bio)