Measure first
Measure finished dimensions, actual stock, openings, and site constraints before ordering material.
Stair geometry
Rise and Run Calculator
Use a target riser count and tread depth to explore a stair option before you mark the layout. The result converts simple inputs into total run, stair angle, and a stringer-length estimate.
How the estimate works
Use the number as a planning starting point.
Riser height equals total rise divided by risers. Tread count is risers minus one, and total run equals tread depth multiplied by tread count.
Check the result
Use the result to compare layout options only. Confirm site dimensions and all applicable stair requirements before cutting stringers.
Plan the next step
Use the related calculators below to turn a first estimate into a material list, layout, or a more detailed project plan.
FAQ
Common Rise and Run Calculator questions
What is total run?
Total run is the horizontal distance covered by all stair treads, not including any landing.
Why is tread count different from riser count?
The upper floor or landing commonly supplies the last walking surface, leaving one fewer constructed tread.
Related tools
Keep the project moving.
Stair Calculator
Free stair calculator. Estimate riser count, riser height, tread depth, total run, and approximate stringer length from your project dimensions.
Open Stair CalculatorStair Angle Calculator
Free stair angle calculator. Convert stair rise and run into degrees, slope percentage, pitch ratio, and approximate stringer length.
Open Stair Angle CalculatorDeck Stair Calculator
Free deck stair calculator. Estimate deck stair risers, treads, rise, run, angle, and approximate stringer length for early layout planning.
Open Deck Stair CalculatorPlanning disclaimer: WoodCutTool results are estimates. Verify measurements, product instructions, material condition, local requirements, and safety practices before buying, cutting, or building.