How this calculator works
Calculate riser count, exact riser height, total run and stair angle.
risers = round(total rise ÷ target riser); exact riser = rise ÷ risers
Architecture · Calculator
Calculate riser count, exact riser height, total run and stair angle.
Calculate riser count, exact riser height, total run and stair angle.
The calculator uses the following core relationship:
Estimating note: Actual material quantities can vary with site conditions, detailing, product dimensions, installation method, and waste.
A stair calculator estimates stair rise, run and number of steps for a practical layout.
Comfort and safety depend on proper stair proportions.
Engineering note: Use these calculations for estimation and planning. Always confirm final designs according to project requirements and applicable standards.
Calculate riser count, exact riser height, total run and stair angle.
The calculator uses inputs such as Total rise (mm), Target riser (mm), Tread depth (mm), and Landing/run adjustment (mm). Use values from your drawings, measurements, product data, or project specifications.
Use outputs such as Risers, Exact riser, Treads, Total run, and Stair angle for estimating and cross-checking. Before purchasing or construction, confirm the dimensions, units, waste factors, supplier packaging, and project specifications.
Continue your estimate with related Construction Calc Lab.