This tool estimates face coverage only. Nosing, stringer trim, starter pieces, pattern alignment and stair-specific product requirements must be counted separately.
01 / Formula
How this is calculated
Area = steps × width × (tread depth + riser height) + landing area02 / Assumptions
What the estimate assumes
- ✓Every tread and riser uses the same dimensions.
- ✓Both horizontal treads and vertical risers receive the finish.
- ✓Landing area is already measured in square feet.
03 / Worked example
See the math in context
Thirteen 3-ft-wide steps with 11-in treads and 7.5-in risers cover about 60 sq ft before landings and waste.
04 / Guidance
Confirm stair-approved products
Stairs need compatible nosings, adhesives or fasteners, slip performance and manufacturer details. Coverage alone does not establish suitability.
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.