Spike's Calculators
Stair Well Floor Opening Size
Calculate the size of the floor opening based on required headroom.
Note: Keep in mind that the required headroom must allow for finished surfaces.
Stair Well Opening
The Calculator
- riser height (unit rise)
- run depth (unit run)
- thickness of floor structure (floor finish material plus joist plus plywood plus ceiling finish)
- required headroom
- nosing, the amount the stair tread projects passed the vertical riser below (if there is any)
The Results
- the length of the opening in the upper floor
Stair Framing
- Advanced Staircase
- Angle of the Stairs
- Stair Riser Height
- Rough Framing, Stairs Material Plus Cost
- Number of Stair Risers Based on Building Code
- Number of Stair Risers Based on Building Code (Metric)
- Simple Stairs
- Stair Design Calculator
- Stair Slope in Degrees and Rise and Run Relationships
- Stair Well Floor Opening Size
- Stringer Length Calculator