Estimate how much paint a room needs and what it will cost.
Wall area is found from the room perimeter times ceiling height, then divided by per-gallon coverage and the number of coats. Paint is only sold in whole gallons, so rounding up gives an accurate shopping list and budget before you start.
Room Paint Cost
Wall area = 2 x (length + width) x height; cans = wall area x coats / 350
Wall area = 2 x (length + width) x height; cans = wall area x coats / 350 Wall area is found from the room perimeter times ceiling height, then divided by per-gallon coverage and the number of coats.
Paint is only sold in whole gallons, so rounding up gives an accurate shopping list and budget before you start.
This calculator takes 5 inputs: Room length, Room width, Ceiling height, Coats, Price per gallon. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.