About CoatCount

Methodology

Coverage plans at 350 sq ft per gallon per coat on smooth interior walls, the conservative end of the 350 to 400 range printed by major manufacturers (Sherwin-Williams and Behr both publish it). Textured interior surfaces figure at 300, popcorn at 250, wood and fiber cement exteriors at 300, and stucco, brick, and block at 250. Deductions are the standard estimating allowances: 20 sq ft per door, 15 per window. Purchase rounding converts exact gallons into cans: quarts fill gaps under a gallon, and three quarts becomes a gallon because it's cheaper. Factors we own rather than cite: the 2.2x floor-to-wall ratio on whole-house pages (from measuring finished rooms), the 10 ft per story exterior height, the 0.9 openings factor, and the cabinet-door areas (7 sq ft per door counting both faces, 1.5 per drawer front, +35% for frames).

Every static number on every page is generated from the same code that runs the live calculators, so the tables and tools can't disagree.

Limitations

These are estimating numbers, good for shopping lists and sanity-checking a painter's bid. They can't see your gables, your stairwell, or how thirsty your particular stucco is. Where the site's assumptions and your walls part ways, trust the tape measure.

How this site makes money

Some pages carry advertising, and some links (marked "sponsored") refer you to services that may pay us for the referral. That never changes the math. The gallons are the gallons.

Contact

Via the contact page.