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build.stair-design Calculator
Calculates riser height and tread depth from total rise and step count, checking both the 2R+T ergonomic formula and code limits (7.75-inch max riser, 10-inch min tread per IBC). Non-compliant stairs are a building code violation and a tripping hazard.
Inputs
Rise
Reference formula or conversion factor shown for context.
Run
Reference formula or conversion factor shown for context.
Max R
Vertical measurement. For health calculators, typically standing height without shoes.
Min G
Reference formula or conversion factor shown for context.
Results
number of risers
Sample size or count used in the calculation.
riser height (mm)
The computed height.
going/tread (mm)
Sample size or count used in the calculation.
2R+G rule
Reference formula or conversion factor shown for context.