Stair flight and landing layout

Stair Landing Calculator

Split a stair run around a landing and estimate the step count, actual riser height, lower and upper flight layout, landing area, stringers, tread pieces, and rough material cost.

Units

Total stair rise (ft)Target riser height (in)Lower flight treads Tread depth (in)Landing length (ft)Landing width (ft)Stair width (ft)Stringer spacing (in)Tread boards per step Waste / extras (%)Cost per stringer ($)Cost per tread board ($)Landing material cost ($/ft²)

Step layout

Total run

Landing area

Rough cost

Stairs with landings need code checks

This calculator estimates layout and materials only. Stair code, maximum riser, minimum tread, landing size, handrails, guards, headroom, stringer support, and local inspection rules must be checked before building.

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Stair Stringer Calculator

Check the basic rise, run, and stringer line before adding a landing.

Stair Tread Calculator

Estimate tread boards when the flight layout is set.

Stair Square Footage Calculator

Estimate finish area across treads, risers, and landings.

View all

Stair landing formula

Steps = ceiling(total rise ÷ target riser height)

Actual riser = total rise ÷ steps

Total run = steps × tread depth + landing length

Landing area = landing length × landing width

Sample takeoff

A 9 ft total rise with 7 lower treads, 10 in tread depth, a 4 ft by 4 ft landing, and 10% waste lays out 15 risers at 7.2 in, 7 lower treads, 8 upper treads, and about 16.5 ft of horizontal run.A 2.7 m total rise with 7 lower treads, 255 mm tread depth, a 1.2 m by 1.2 m landing, and 10% waste lays out 15 risers at 180 mm, 7 lower treads, 8 upper treads, and about 5.0 m of horizontal run.

Stair Landing Calculator FAQ

How do I calculate stairs with a landing?+

Calculate the total step count from rise and target riser height, choose how many treads are before the landing, then put the remaining treads in the upper flight.Calculate the total step count from rise and target riser height, choose how many treads are before the landing, then put the remaining treads in the upper flight.

Does the landing count as a tread?+

For material and run planning, the landing is a separate platform area. This calculator adds landing length to the horizontal run and landing area to the material estimate.For material and run planning, the landing is a separate platform area. This calculator adds landing length to the horizontal run and landing area to the material estimate.

Can this approve stair code?+

No. Use this for layout math only. Check riser uniformity, landing size, handrails, guards, headroom, and local code before cutting.No. Use this for layout math only. Check riser uniformity, landing size, handrails, guards, headroom, and local code before cutting.