Drywall Mud Calculator
Plan how much drywall mud is needed for taping and finishing walls or ceilings.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Enter drywall area and finishing level assumptions to estimate mud quantity.
What the math is doing
Gallons = (sq ft ÷ 100) × 0.13 × (1+waste).
Frequently asked questions
Lightweight vs all purpose?
Coverage is similar per pass; heavy fills use more.
Setting compound?
Bags convert separately from this gallon model.
Texture?
Add extra for knockdown or orange peel.
Sanding dust?
Better taping reduces sanding waste.