What does this tool do?
Joint compound use scales with drywall area, the number of coats and the finish level. This calculator applies a per-square-foot rate for taping and finishing, then converts the result to ready-mix tubs.
The Formula
Compound (gal) = Area × Coats × 0.0014 × (1 + Waste ÷ 100)Frequently Asked Questions
How much joint compound do I need per sheet?
Roughly 0.2 gal per 4 × 8 sheet for three coats, though tight joints and heavy texture use more.
Ready-mix or powder?
Ready-mix is convenient for small jobs; powder is cheaper in bulk and lets you control the consistency.