Calculate gallons of ceiling paint from room length, width, coats, paint coverage and waste allowance. Get both the calculated amount and a rounded purchase estimate.
Enter your measurements and material details.
Textured or porous ceilings can use more paint than a smooth, sealed surface.
Ceiling area is length multiplied by width. The calculator multiplies that area by the number of coats, divides by the coverage per gallon and then applies the selected allowance.
Measure the ceiling footprint, not the floor trim perimeter. For vaulted ceilings, divide the surface into planes and calculate their actual sloped areas instead of using only the room footprint.
At 350–400 square feet per gallon, one gallon may cover one coat, but product coverage and texture vary.
Two coats are common for even coverage, but existing color, primer and product can change that.
A small allowance helps with roller loading, tray loss and touch-ups.
No. It estimates the ceiling surface only.
Yes if you enter the actual sloped surface area through separate sections; a simple footprint understates vaulted area.
Using the example inputs shown in the calculator — Room length (ft) = 14, Room width (ft) = 12, Number of coats = 2, Coverage per gallon (sq ft) = 350, Extra allowance (%) = 5 — the result is 1.01 gallons. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.
The result breakdown also shows Ceiling area: 168 sq ft; Rounded purchase: 2 gal. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.
For this ceiling paint calculator, the inputs with the greatest practical effect are room length, room width and number of coats. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.
Ceiling Paint Calculator is intended to help with quantity planning and arithmetic. It does not inspect the site, choose structural dimensions, determine code compliance or replace manufacturer installation instructions. Conditions such as slope, substrate quality, moisture, soil, framing, access and workmanship can change the final amount required.
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