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Calculate how much paint you need for drywall. Select surface condition — unprimed new drywall absorbs significantly more paint than a primed surface. Includes L/gal toggle.
Part of the Surfaces & Finishes calculators — see all tools in this category.
This calculator estimates paint quantity for drywall by applying a surface-condition-specific coverage rate to your total area.
Formula: Paint = (Area × Coats) ÷ Coverage Rate × (1 + Waste %)
Note: Unprimed drywall requires ~43% more paint than primed (7 vs 10 m²/L). The calculator accounts for this automatically — no manual adjustment needed.
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Total drywall area to be painted
Standard coverage on a primed surface
1–3 coats (2 recommended for new drywall)
Typical waste is 10% for roller painting
Previously primed, 2 coats
Total drywall area
Previously primed