How much paint will you need if a room is 10ft/15ft and the walls are 9ft tall there is a window on the front wall that is 5ft/4ft the door is 7ft/3ft

Thanks for taking the time to ask a question about Reserve. I'd suggest using 1.5 gallons of paint per coat of paint. I'd suggest applying 2 coats of paint, so you will need about 3 gallons of paint for that size of a room. Respectfully, Roger