Stair Calculator
Estimate riser count, tread depth, and stair run.
This page is an editable estimator with realistic defaults so you can model your own situation in minutes.
Risers = total rise / target riser height.
Total run = tread depth x number of treads.
| Target riser | 7.5 in |
|---|
Assumptions
- Stair dimensions are code-sensitive.
- Verify rise, run, headroom, landing, handrail, and local code requirements.
How this calculator works
Formula used
Risers = total rise / target riser height. Total run = tread depth x number of treads.
Example calculation
Plug in your own numbers and the result updates instantly. Risers = total rise / target riser height. Total run = tread depth x number of treads.
Stair Calculator FAQ
Is this stair calculator exact?
No. It is an estimating tool only. Actual quantities can change with field measurements, waste, layout, product dimensions, building codes, soil conditions, and installer methods.
Should I add extra material?
Usually yes. Many projects use a waste factor for cuts, breakage, overlap, spillage, grading, or mistakes. The best waste factor depends on the material and layout.
Should I verify before ordering?
Yes. Confirm quantities with your contractor, supplier, plans, local code requirements, and product installation instructions before purchasing materials.