Measure floor-to-floor rise
The count rounds upward so actual rise does not exceed the target. One straight flight has one fewer tread than risers in this model.
Materials/Structure · FREE
Staircase Planning
Explore a straight-flight riser count and finish area; safe design still requires professional review.
Your planning summary
Complete the inputs to see your result and assumptions. No login or contact details required.
UNDERSTAND YOUR RESULT
Understand Your Stair Geometry
Compare the total rise with your chosen riser and tread dimensions. A geometry result still needs professional safety and structural review.
Choose stair dimensions
Headroom, guardrails, landings, escape requirements and structural support need professional review. Spiral geometry is not implied by this straight-flight result.
Review risers and run
Review the displayed breakdown and assumptions before using this estimate.
Explore an illustrative example
Straight flight example. Use the example button in the calculator to apply these editable inputs.
Illustrative measurements or assumptions only; not an approved design, quote or offer.
What changes your result?
- Risers must be whole numbers. The count rounds upward so actual rise does not exceed the target. One straight flight has one fewer tread than risers in this model.
- Geometry is not a safety approval. Headroom, guardrails, landings, escape requirements and structural support need professional review. Spiral geometry is not implied by this straight-flight result.
Assumptions and limits
Confirm measurements, inclusions and price assumptions. These planning results do not replace professional engineering, legal or lender advice.
Results retain the assumptions you selected. Compare like-for-like areas and avoid counting the same item twice.
View Technical Calculation Details
Risers=ceil(height/target); treads=risers−flights (1 straight, 2 L/U); combined run=treads×tread; finish area=(run+height)×width+landings. Spiral requires professional geometry.
Currency totals: 2 decimal places; geometry and quantities: 6. Whole units/boxes round upward with floating-point ULP correction; internal calculation precision is retained.
Formula 2.0.0 · Content/schema 2
Sources and review information
References last checked 2026-10-29. This is not certification of a fee schedule or property.
Your questions, answered
Risers must be whole numbers
The count rounds upward so actual rise does not exceed the target. One straight flight has one fewer tread than risers in this model.
Geometry is not a safety approval
Headroom, guardrails, landings, escape requirements and structural support need professional review. Spiral geometry is not implied by this straight-flight result.
Can I save or download for free?
Yes. PDF and comparisons are free. Saving a report is optional and needs consent; a calculation needs no contact details.
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