COST
Paint Cost Calculator
Paint/primer coverage: 350-400 sq ft per gallon per coat (default 375), consistent with the app's existing paint quantity convention. Gallons = ceil(area x coats / coverage).
PAINTING
Primer Calculator
Primer coverage: 350-400 sq ft per gallon per coat, defaulting to the 375 sq ft/gal midpoint used consistently with the app's paint quantity calculator.
WALLPAPER
Wallpaper Roll Calculator
Standard US double roll covers ≈56 sq ft gross, but usable coverage after pattern-repeat waste is typically only 25-30 sq ft — this calculator defaults to the 30 sq ft/roll usable estimate, adjustable for your pattern repeat.