Measure every surface
Break irregular rooms into simple rectangles. Measure each area, then add them together before allowing for waste.
Free project planning tools
Measure once.
Build with confidence.
Fast, accurate calculators for paint, tile, flooring, concrete, and project costs. No signup. No guesswork.
Start calculating✓ Metric & imperial✓ Instant results✓ Free to use
12.4 ft
8.2 ft
Paint estimateReady
Estimated paint4.2 gal
+ 10% waste
2 coats
Choose your calculator
Five essential tools for your next projectInteractive calculator
Paint calculator
Estimate wall area and the paint required for your room. Adjust any value and your estimate updates instantly.
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Project inputs
Build smarter
Good estimates start with good measurements.
Use the product label
Coverage and yield differ by brand, material, surface, and installation method. Replace our defaults with the label values.
Buy a practical buffer
A waste allowance covers cuts, breakage, pattern matching, and future repairs. Complex layouts usually need more.
BW
Built for planning—not pressure.
BuildWise turns basic dimensions into clear material estimates without collecting personal information or requiring an account. Use it to plan, compare options, and have a better conversation with your supplier or contractor.