Paint Calculator
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For a 12 ft × 10 ft room with 8 ft walls, 1 door, and 2 windows, painted with 2 coats, you'll need about 2 gallons of paint.
Paint needed
2 gallons
That's a typical amount for a standard bedroom, living room, or similarly sized space.
Buy it all in one trip rather than going back for more later — cans from the same production batch match color exactly, while a second trip risks a subtle shade difference on the wall.
Wall area: 304 sq ft
Raw computed amount: 1.74 gallons