What this tool does
Enter total rise, the desired or maximum riser height and tread depth. The calculator rounds up to a whole number of risers, recalculates the exact riser height and creates a dimensioned stair profile.
Formula
risers = ceiling(total rise ÷ maximum riser); treads = risers − 1; stringer = √(rise² + run²)
Examples
108 in rise · 7.75 in max riser · 10 in tread
14 risers · 13 treads · 130 in total run
Frequently asked questions
Does this confirm building-code compliance?
No. It provides geometry. Verify riser, tread, landing, headroom, handrail and guard requirements locally.
Why is the exact riser smaller than my maximum?
The total rise is divided evenly across a whole number of risers so every riser has the same height.