For irregular rooms, break into rectangles and add the results.
Order 5–10% extra for waste. 60 lb bag ≈ 0.45 cu ft — 80 lb bag ≈ 0.60 cu ft.
Use nominal dimensions (e.g., a 2×4 is entered as 2 in × 4 in).
Most interior paints cover 350–400 sq ft/gal. Check your paint's label. Calculate each surface separately and add them together.
1 square = 100 sq ft. 3 bundles per square (standard 3-tab). Use 10% waste for simple roofs, 15% for complex or steep roofs.
Includes the end stud. Add extra for corners, headers, and openings. Common spacings: 16" OC (standard) or 24" OC (advanced framing).
Enter a multiplier and click APPLY 3-4-5 to get the side lengths (e.g. multiplier 2 → 6, 8, 10). Or enter any two sides to solve for the third using the Pythagorean theorem.