Stair Stringer Calculator
SI
Imp
Imperial
Inputs
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Total rise
(H)
Finished floor-to-floor or deck-to-grade height.
ft
Target riser height
(h_target)
Preferred riser height used to choose the number of risers.
in
Tread run
(d)
Horizontal tread run used for each step, before nosing details.
in
Max riser screen
Screening limit for actual riser height. Use the adopted local code for real work.
in
Min tread screen
Screening limit for tread run. Use the adopted local code for real work.
in
Results
Default result
Edit inputs
Risers
15
risers
Rounded up from total rise divided by target riser height.
Also computed
Actual riser height
Pass
7.2
in
Treads
14
treads
Tread run used
10
in
Total run
11.667
ft
Stringer length
14.735
ft
Stair angle
37.65
°
Riser margin
0.55
in
Tread margin
0
in
Show 2 more results
Method notes
3 notes
Risers = ceil(total rise / target riser height); actual riser height = total rise / risers.
Treads are counted as risers minus one for a stair ending at an upper landing or floor.
This is layout arithmetic only. Landings, nosing, headroom, handrails, guards, stringer strength, attachment, permits and adopted code requirements are not checked.
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