Sketch the room as two overlapping rectangles. Enter the shared overlap once so it is not counted in both sections.
01 / Formula
How this is calculated
Net area = length A × width A + length B × width B − overlap − exclusions02 / Assumptions
What the estimate assumes
- ✓The room can be represented by two rectangles.
- ✓Overlap is measured in square feet.
- ✓Package coverage comes from the selected product.
03 / Worked example
See the math in context
An 18 × 12 rectangle plus a 10 × 8 rectangle, minus 40 sq ft of overlap, produces 256 sq ft before exclusions and waste.
04 / Guidance
Check the overlap on a sketch
Draw both rectangles and shade their shared area. If the rectangles meet without overlapping, enter zero.
Questions
Frequently asked
Why add a waste allowance?+
Cuts, layout, defects, breakage, and future repairs can require more material than the net floor area. Keep the allowance visible and adjust it for the product and pattern.
Should I buy by square foot or by box?+
Calculate square footage first, then divide by the exact coverage printed on the package and round up to whole packages. Use the calculator’s editable package coverage.