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Estimate stair riser and tread dimensions using total rise and available run. Check fit quality and comfort ratio early in staircase planning.
Last updated: April 14, 2026
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Fit Status
Tight fit
Riser Height
7.20 in
Tread Depth
7.80 in
Run Used
132.0 in
Comfort Ratio (2R + T)
22.20 in
Code and Comfort Note
Steep stair profile. Consider more steps or deeper treads.
Consistent vertical step spacing helps prevent trip hazards and supports smoother stair usage.
Limited run often drives tighter treads, so early geometry checks prevent late redesigns.
The comfort ratio helps gauge whether stair pitch feels too steep or overly shallow.
For 108 in rise, 132 in run, 15 steps, 1 in nosing:
Riser
7.2 in
Tread
7.8 in
Fit
Comfortable
This calculator divides total rise across step count to estimate riser height, allocates available run across steps for tread depth, and evaluates overall proportion with a common comfort ratio check.
Riser Height = Total Rise / Step CountTread Depth = (Available Run / Step Count) - NosingComfort Ratio = 2R + TShare it with designers, builders, and remodel planners.
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