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BuildRight
Divides total rise into even steps and calculates the resulting run — the layout math behind every stair stringer.
Building code requires every riser in a staircase to be the same height (usually within 3/8" of each other) — this calculator finds the number of steps that divides your total rise as evenly as possible into your target riser height.
Riser height, tread depth, and total staircase width are all governed by local building codes, which vary — this calculator does the layout math but doesn't verify code compliance for your specific jurisdiction.
Number of steps
14
Building codes typically require riser heights between 7-7.75 inches — check your local code before finalizing.
What you entered
Number of risers (rounded to a whole step)
108 ÷ 7.5= 14 stepsActual riser height once evenly divided
108 ÷ 14= 7.7143 inTotal horizontal run
(14 − 1) × 10= 130 inResult
Number of steps: 14
A 108" total rise needs 14 steps at 7.714285714285714" each, for a total run of 130".