Stair Stringer Calculator
Calculate stair riser count, actual riser height, total run, stringer length, angle, stringer quantity and stock-material cost.
Default project preview
13.93 ft
Actual riser height
7.5 in
Total horizontal run
10.83 ft
Stair angle
38.9°
Stringer quantity
5
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Risers = round up (total rise ÷ target riser). Actual riser = total rise ÷ risers. Run = tread depth × (risers − 1). Stringer length is the hypotenuse.
FAQ
Stair Stringer Calculator questions
Why is the actual riser different from the target?+
The target sets the maximum planning height. The total rise is divided into an integer number of equal risers.
Why are there usually fewer treads than risers?+
The upper floor or landing commonly serves as the final tread, leaving one fewer horizontal tread space.
Can long stringers be spliced?+
Only with an approved structural detail. Do not assume ordinary field splices are acceptable.