About PaintRoomCalc
PaintRoomCalc helps DIY painters and contractors buy the right amount of paint — no waste, no mid-project trips to the store. We use industry-standard coverage rates (350-400 sq ft per gallon for latex paint) and practical door and window deductions that match how painters actually work.
All calculations run in your browser. We do not track you or sell your data. Coverage varies by brand and surface, so we always recommend checking the label on your can before you buy.
The site is maintained by a small team of home-improvement writers who test each calculator against real room measurements. If a tool ever seems off, tell us and we fix it.
Our calculators cover the jobs homeowners face most: a single room, a whole house, the exterior, primer with ceiling and trim, project cost, and the extra coats a color change needs. Each tool uses the same coverage numbers, so a plan stays consistent from one page to the next. We keep the interface simple on purpose — no accounts, no downloads, no clutter standing between you and the answer.
We built PaintRoomCalc because buying paint is one of the few home projects where a quick estimate saves real money. A small overestimate means a wasted can sitting in the garage; a small underestimate means a second trip and a possible color mismatch on a fresh batch. Our goal is to put the right number in front of you in seconds, then step out of the way.