Paint Calculator & Weather

Know how much paint to buy—and when the weather gives it time to dry. Paint Calculator & Weather turns room measurements into a practical buy plan. Build a project with multiple rooms and colors, subtract doors and windows, account for coats and coverage, compare can combinations, and check upcoming exterior painting conditions. PAINT CALCULATOR • Add full rooms, individual walls, ceilings, trim, doors, or a known area • Subtract windows and openings • Set coverage per gallon, number of coats, primer, surface condition, and waste allowance • Use square feet or square meters and gallons or liters BUY PLAN • Compare quart, one-gallon, and five-gallon combinations • Enter shelf prices to balance cost, leftover, and number of cans • Keep separate totals for each color • Save and duplicate projects • Share a clean shopping list PAINTING WEATHER • Find continuous exterior painting windows from hourly conditions • Check temperature, humidity, rain, wind, and dew-point spread • Include recoat and rain-free drying time • Use built-in starting profiles or your paint manufacturer's limits • See why a window is marked good, caution, or unsuitable PRIVATE BY DESIGN No account. No ads. No subscription. Projects stay on your device. Weather features require an internet connection and an optional location or a place you enter. Weather and drying results are planning estimates, not guarantees. Forecasts change. Always follow the paint manufacturer's technical data sheet, inspect the actual surface, and use appropriate professional judgment. Forecast and geocoding data are provided by Open-Meteo.