Measure. Calculate. Keep the plan.
Paint calculator
Turn your room measurements into a paint shopping list.
Before you buy
What is this estimate based on?
Your measurements, the coverage or size printed on the product you chose, and the allowance you typed. Paint, wallpaper and flooring use different purchase rules; open “See the calculation” above to follow the numbers.
Why round up to a package?
A calculated quantity and a shopping quantity are not the same thing. This tool rounds up to the can, roll or box sizes you told it about. It does not compare prices or pick a brand.
What this calculator does not cover
Paint: ceilings, trim and primer unless you measure them separately. Wallpaper: half-drop and offset patterns, murals, offcut reuse. Flooring: cutting layouts, subfloor and installation decisions. It is quantity planning, not installation advice.
Product labels and source references
Confirm coverage and packaging on the product you plan to buy. Reading references, not endorsements of this site: a manufacturer paint data sheet showing coverage as a range (Benjamin Moore Ultra Spec 500 N538, 350–400 sq ft/gal), a wallpaper maker on single vs double rolls and measuring for rolls, and one flooring carton spec (Shaw 2045V-07066, 23.64 sq ft per carton).
Three materials, one notebook
Each calculator turns what you measured and what the label says into whole cans, rolls or boxes, and shows the arithmetic. Save a project to reopen it in the store.