Straight Stair Geometry Calculator
Calculate equal rise, tread depth and slope from an entered stair count and total dimensions.
Your result
EVERYDAYEnter your values and select calculate.
On this page How it works & practical examples
How to use the Straight Stair Geometry Calculator
This convention uses the upper floor as the final landing, giving one fewer tread than risers. The total run includes only the equal-depth treads.
The calculation
Worked example
2,800 mm rise, 16 risers and 4,200 mm horizontal run give 175 mm individual rise and 280 mm tread depth.
Assumptions and limits
Descriptive geometry only. Does not check building codes, headroom, handrails, landings, structural capacity or accessibility requirements.
Common questions
Which inputs should I use?
This convention uses the upper floor as the final landing, giving one fewer tread than risers. The total run includes only the equal-depth treads.
What does the result exclude?
Descriptive geometry only. Does not check building codes, headroom, handrails, landings, structural capacity or accessibility requirements.