How Much Paint for a Bathroom
Worked scenarios are illustrative composites. Our editorial pen name and method.
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A bathroom can be fiddly to estimate because tile, surrounds, mirrors and other unpainted areas are a large share of a small room. Measure those exclusions instead of copying a room-size allowance.
Why the deductions matter more here
Start the normal way — perimeter times height for gross wall area — then subtract everything you won’t paint. In a bathroom that list is long relative to the room:
- The tub or shower surround (often tiled or a solid unit) — you paint up to it, not behind it.
- Any tiled wainscot or backsplash — subtract the tiled area.
- The vanity footprint on the wall and the mirror.
- The measured area of the door and window; the calculator does not assign either a standard size.
For an illustrative 5-by-8 bathroom with 8-foot walls, gross wall is (5 + 8) × 2 × 8 = 208 sq ft. Suppose its measured exclusions are a 40-sq-ft tiled tub wall, a 3-by-7-foot door, 20 sq ft of mirror and backsplash, and a 3-by-5-foot window. Subtracting those example measurements leaves roughly 112 sq ft of painted wall. Your result can differ sharply because bathrooms devote so much wall area to fixtures and tile.
Turning it into paint
At an illustrative two coats and 350 sq ft per gallon, 112 sq ft needs 112 × 2 ÷ 350 = 0.64 gallon before package rounding. The example 5-by-8 ceiling is a separate 40-sq-ft surface; calculate it with the ceiling product’s own coverage and coat plan.
The one product note that matters in a bathroom
Ventilation, condensation, splashes and the existing surface affect the coating choice. Select a product whose manufacturer approves it for the actual surface and moisture conditions, and follow its preparation instructions. Sheen alone is not a substitute for resolving a leak, active moisture or existing mildew. This choice does not change the measured square footage, but it does determine the coverage number used.
Small-bath takeoff errors
- Estimating a bath like a bedroom. The cut-outs are a big share of a small room — subtract them.
- Buying every coating in the same package size. Calculate walls, ceiling and trim separately.
- Choosing by sheen alone. Verify the product is approved for the surface and conditions, then use its coverage.
- Painting behind fixtures you’ll keep. You paint up to the tub and vanity, not behind them.
Moisture and surface condition come before paint
These are planning estimates. Real coverage depends on the exact product, the surface and how many coats a color needs, and a bathroom may need surface prep for any existing mildew or moisture damage before paint goes on. Read the label of the paint you choose and let a test patch settle any doubt.
Enter your measured wall area, openings and the product’s own coverage in the paint calculator, keeping the ceiling and any trim on separate lines. These are general-information estimates, not professional advice.