Stair surface area estimator

Stair Square Footage Calculator

Estimate the surface area of stair treads, risers, and landings for carpet, flooring, paint, or finish material. Enter the step count, tread depth, riser height, stair width, and waste to get an order area.

Units

Number of steps Tread depth (in)Riser height (in)Stair width (ft)Landing area (ft²)Waste / cuts (%)Package coverage (ft²)Cost per area ($/ft²)

Order area

Packages to buy

Measured area

Rough cost

Stair finish layouts need installer checks

This estimates surface area only. Nosing, wrapped edges, patterned carpet, landings, winders, transitions, adhesive, stair code, and product installation rules can change the final material order.

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Stair Stringer Calculator

Set the stair rise and run before estimating finish material.

Stair Tread Calculator

Estimate tread board counts when using stock boards.

Carpet Calculator

Estimate room carpet and roll length around the stair work.

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Stair square footage formula

Per-step area = stair width × (tread depth + riser height)

Measured area = per-step area × steps + landing area

Order area = measured area × (1 + waste %)

Packages = order area ÷ package coverage

Sample takeoff

Twelve steps with 10 in treads, 7.5 in risers, 3 ft width, a 12 ft² landing, and 12% waste need about 72.2 ft² of finish material, or four 20 ft² packages.Twelve steps with 255 mm treads, 190 mm risers, 0.9 m width, a 1.1 m² landing, and 12% waste need about 6.6 m² of finish material, or four 1.8 m² packages.

Stair Square Footage Calculator FAQ

How do I calculate stair square footage?+

Multiply stair width by tread depth plus riser height for each step, multiply by the number of steps, add landing area, then add waste.Multiply stair width by tread depth plus riser height for each step, multiply by the number of steps, add landing area, then add waste.

Should I include risers?+

Include risers when the material wraps or covers the vertical face. For tread-only work, set riser height to zero.Include risers when the material wraps or covers the vertical face. For tread-only work, set riser height to zero.

Can I use this for carpet on stairs?+

Yes for early area planning. Carpet roll width, seams, direction, padding, nosing, and installer layout still control the final order.Yes for early area planning. Carpet roll width, seams, direction, padding, nosing, and installer layout still control the final order.