Key terms
Floor-to-floor height is the vertical distance between levels. Riser is vertical step height; tread is horizontal step depth.
Basic calculation
Approximate risers = floor-to-floor height ÷ target riser height. The final whole number must then be checked for practical geometry.
Worked example
For 3.0 m height and a target riser near 0.167 m, about 18 risers result. A 17-tread run at 0.28 m is about 4.76 m.
How to use the calculator
Enter floor height, riser and tread. Review the estimated risers and run, then check against the architectural layout.
Safety note
Final stairs must comply with applicable building requirements and professional design review.
Use the Staircase Calculator
Enter your project values and get a quick preliminary calculation.
Frequently Asked Questions
How many risers are needed?
Divide total height by the target riser and adjust to a practical whole number.
What tread size should I use?
Use the dimension required by the responsible designer and applicable regulations.
Does the tool design a staircase?
No; it provides preliminary geometry.
Should landings be included?
Yes, final planning must account for landings, headroom and circulation.