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Paint Calculator
Calculate how much paint you need for any room.
100% FreeNo sign-up required
Accurate ResultsBased on real formulas
Easy to UseGet results in seconds
Calculate how much paint you need for any room.
How to Calculate Paint Calculator
🧮 Formula
Paint Needed = (Paintable Area × Coats) ÷ Coverage, where Paintable Area = Wall Area − Door/Window Deductions, and Wall Area = 2 × (Length + Width) × Height
📄 Example Calculation
A 15×12 ft room with 9 ft walls, 2 doors and 2 windows, 2 coats at 350 sq ft/gallon coverage needs about 2.37 gallons — round up to 3 gallons so you don't run short mid-coat.
Factors That Affect the Result
✓ Number of coats
✓ Wall texture and condition
✓ Paint type and finish
✓ Doors and windows
✓ Coverage per gallon
Frequently Asked Questions
Does this include the ceiling?
No — this calculator covers wall area only. Ceilings typically need separate paint and are usually a single coat.
What if my room has an unusual shape?
For L-shaped or irregular rooms, split the space into rectangles, calculate each separately, and add the paint totals together.
Should I round up or down on the recommended purchase?
Always round up — running short mid-job means an interrupted dry time and a visible seam where you resume painting.