Stair Calculator
Estimate stair risers and total run for planning purposes.
How to Use the Stair Calculator
Enter total rise and preferred step dimensions to estimate riser count, riser height and tread layout.
Practical Example
A total rise of 280 cm divided into 16 risers gives an average riser height of 17.5 cm.
Factors That Affect the Result
Local codes, floor finishes, available run, landing requirements, nosing and exact framing dimensions can change the final stair design.
Frequently Asked Questions
What is total rise?
It is the vertical height from the lower finished floor to the upper finished floor.
Should every riser be equal?
Yes. Consistent riser height is important for safe, comfortable stairs.
Does this replace code checks?
No. Verify final dimensions against local building requirements.
Related Tools
Stair Calculation Guidance
Use the total rise and available run to estimate step count, riser height and tread depth. Small measurement errors can affect every step, so measure finished-floor to finished-floor height rather than rough framing dimensions. Building codes may limit maximum riser height and minimum tread depth, and landings or headroom can also affect the design. Treat the result as a planning aid and verify the final stair geometry against local code requirements before construction.