A room-level estimate when wall area and coat count are the main questions.
Wall height and lengths, major openings, coats and the exact coverage rate.
Paintable area and rounded containers for the planned coats.
Floor area is not wall area; verify primer and finish coverage separately.
Estimate room paint for four walls using room dimensions, ceiling height, openings, coats and product coverage.
Estimate room paint for four walls using room dimensions, ceiling height, openings, coats and product coverage. Use the working RenoMetric calculator below for the actual estimate, then use this page to check assumptions, package rounding and project-specific considerations.
Use your measurements to see the estimated project quantity.
Add waste and round to complete bags, boxes, cans, bundles or delivery quantities.
Review product coverage, site conditions, local requirements and supplier details before ordering.
Use the calculator result as a planning quantity, then verify the final order with the product label or supplier quote.
Open the working Paint calculator
A 12 × 10 ft room with 8 ft walls has 352 ft² of gross wall area before subtracting doors and windows.
Measure the actual project rather than relying on listing dimensions. For irregular spaces, split the surface into simple measurable sections and add the results. Use the exact product label for package coverage, yield, density or square-foot coverage whenever it is available.
Keep waste and package rounding as separate steps. Waste covers cuts, breakage, pattern matching and unavoidable offcuts. Package rounding reflects the fact that many materials are sold only in complete bags, boxes, bundles or cans.
Before you buy: this page is a planning guide, not a contractor quotation or structural design. Verify final quantities with the product manufacturer, supplier or installer when project conditions could materially change the result.
Not unless you intentionally add ceiling area. Ceiling paint is best estimated separately because product and finish may differ.
Include them if they will be painted with the same product. Measure them separately for clearer planning.
Paint is sold in fixed container sizes, and a small reserve is useful for cutting in and touch-ups.