Home improvement planning
Ceiling Paint Calculator
How much paint do I need for a ceiling? Enter the length and width of one rectangular ceiling, then account for coats, paint coverage, overhead waste, and the number of whole gallons or liters to buy.
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Results
Enter your measurements to see an estimate.
A little planning goes a long way
How It Works
Measure the ceiling
Enter the room length and width. This estimate covers one rectangular ceiling plane and does not include the walls, trim, or crown molding.
Read the paint label
Use the coverage rate for one coat on your chosen ceiling paint. Textured, porous, stained, or patched ceilings may need a different rate or primer.
Plan the purchase
We multiply the ceiling area by the number of coats, add your overhead-work allowance, and round up to whole gallons or liters.
Formula
- Ceiling Area
- room length × room width
- Total Coverage
- ceiling area × number of coats
- Paint Needed
- (total coverage ÷ paint coverage) × (1 + waste ÷ 100)
- Recommended Purchase
- paint needed rounded up to the next whole gallon or liter
- Estimated Material Cost
- recommended purchase × price per gallon or liter
Example Calculation
A 14 × 12 ft ceiling with two coats, paint rated at 350 sq ft per gallon, 15% extra waste, and paint priced at $45 per gallon.
- Ceiling area: 14 × 12 = 168 sq ft.
- Two coats: 168 × 2 = 336 sq ft of total coverage.
- Paint needed after coverage and waste: 1.1 gallons.
- Round the paint purchase up to 2 gallons.
- 2 × $45 = $90.00 estimated paint cost.
Buy 2 gallons for this example. The estimated ceiling paint cost is $90.00, before tax and preparation supplies.
FAQ
How much ceiling paint should I buy?
Measure the ceiling area, multiply by the number of coats, divide by the coverage on your paint label, and add an allowance for roller loss and touch-ups. This calculator does those steps and rounds up to whole gallons or liters.
Why does ceiling paint need extra waste?
Overhead work can leave more paint in the roller, tray, and drop cloth, and textured ceilings can absorb more product. The default 15% is a planning starting point; adjust it for texture, repairs, and your painting method.
Should I subtract light fixtures or vents?
Small fixtures and vents are usually left in the estimate because they still require cut-in work and do not materially reduce a typical ceiling order. Large skylights or openings should be measured as separate areas and deducted from the ceiling area before using the calculator.
Do I need one or two coats?
Two coats are a common starting point for an even finish, a color change, or a repaired ceiling. Follow the paint label and account for primer separately when the surface is bare, stained, or patched.
What changes when I switch to metric?
Feet become meters, square feet become square meters, and US gallons become liters. Coverage and price convert with them, while the underlying estimate remains equivalent. Whole-liter rounding can produce a different purchase count than whole-gallon rounding.
What does the estimated cost include?
The cost is the whole paint purchase multiplied by the price you enter. It excludes primer, rollers, extension poles, tape, drop cloths, labor, delivery, and sales tax.