Paint Calculator
Estimate gallons of paint for walls and ceiling
Estimate how many gallons of paint a room needs, based on the wall area, the number of coats, and the paint's coverage.
Estimate paint needed. Typical coverage is 350–400 sq ft per gallon; adjust to your paint's label.
Paintable Area
448
sq ft
Gallons Needed
3
2 coats
Estimated Cost
$120.00
How to Use This Calculator
- Enter the room length, width, and wall height.
- Enter the number of coats.
- Choose whether to include the ceiling.
- Enter the paint's coverage (often around 350 sq ft/gal).
- Optionally enter the price per gallon.
- Review the gallons needed and estimated cost.
Why Use This Calculator?
- Buying paint without running short mid-job.
- Comparing one coat vs. two.
- Budgeting a room repaint.
Real-World Examples
A 16 × 12 ft room, 8 ft walls, 2 coats
Walls total about 448 sq ft; two coats need roughly 896 sq ft of coverage — about 3 gallons at 350 sq ft per gallon.
Frequently Asked Questions
How much does a gallon cover?
Typical wall paint covers 350–400 sq ft per gallon on a smooth surface. Check your paint can — porous or dark walls may need more.
Does this subtract doors and windows?
No. It includes the full wall area, which usually covers the paint you'd otherwise subtract for small openings.
Do I really need two coats?
Often yes, especially over a darker color or with a lighter paint. Some premium paints cover in one, but plan for two to be safe.
Important Disclaimer
Estimates based on the coverage you enter. Actual coverage varies with surface texture, color, and application. Buy a little extra for touch-ups.
Privacy
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