Plan stair geometry for comfort, safety, and code-aligned dimensions.
Overview
Stair design balances riser height and tread depth for safe, comfortable movement.
This calculator helps determine practical step count from floor-to-floor rise.
Always verify local building codes before construction.
Steps
Input vertical distance from lower to upper finished floor.
Choose desired riser height constraints.
Divide total rise by chosen riser height and round appropriately.
Determine tread depth and total horizontal run.
Verify dimensions against local code limits.
Math
Riser Height = Total Rise / Number of Risers
Step geometry is determined by dividing vertical rise into equal risers and matching treads.
Worked cases
108/15
Riser 7.2 in
14*10
Total run 140 in
108/16
Riser 6.75 in
Why use this
Questions