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Stairs Calculator
Total rise divided by target riser height.
Choose a stair workflowEstimate riser count or produce a comprehensive riser, tread, stringer, and slope plan.
2 optionsSTAIR RISERS15 risers
ceil(total rise ÷ target riser height). Only inputs needed by this operation are shown.
Estimate based on the values shownFormula checkedRisers round up; comprehensive geometry derives actual rise, tread run, slope, and stringer length. Detailed planning supports target-rise or fixed-count sizing, optional tread thickness, headroom and floor-opening restrictions, three mounts, and inch/foot/meter/centimeter inputs. Headroom checking can be explicitly disabled when the project has no headroom restriction.