Question
Does this replace building-code checks?
No. This is a planning tool only. Final stair design should always be checked against local code requirements for rise, tread depth, width, landings, and headroom.
Daily utilities
Use OmniCalc's stair calculator to estimate a straight stair layout from rise, tread, and width inputs.
Stair calculator
Use this calculator to plan a straight stair layout from the total rise, desired rise per step, tread depth, width, and optional landing allowance.
This tool is helpful for rough stair planning and material estimates. Always confirm code, headroom, framing, and site-specific requirements before building.
Why this result matters
A practical stair-layout estimator for straight-run stairs that helps with riser count, tread count, run, angle, and rough footprint planning while clearly warning that local code still governs the final design. Use the tool above to enter a few clear inputs and get a practical answer you can use right away.
This stair calculator helps homeowners, contractors, and planners estimate risers, treads, total run, stair angle, and rough footprint for a straight-run stair layout. It is useful for quick planning, remodeling prep, and early material checks, while still leaving final code compliance and structural details to the actual build review.
Formula and method
The calculator estimates riser count from total rise and target rise, computes the actual rise per step, then uses tread depth and any landing allowance to estimate total run, angle, and footprint.
Example
If the total rise is 108 inches with a target 7-inch rise and 10.5-inch treads, the calculator estimates 15 risers, 14 treads, about 147 inches of run, and an angle a little above 36 degrees.
FAQ
Short answers to the questions people often ask before or after using the tool.
Question
No. This is a planning tool only. Final stair design should always be checked against local code requirements for rise, tread depth, width, landings, and headroom.
Question
Because the total rise usually has to be divided into a whole number of risers. That means the exact rise per step often shifts slightly from the original target.
Question
It is the approximate slope of the stair based on the total rise and total run. It helps give a quick sense of how steep the layout may feel.
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