Total Rise (Finished Floor to Floor)
How to Calculate Stair Risers Properly
Building stairs requires absolute precision. Being off by even a fraction of an inch can ruin the entire run. This calculator eliminates the guesswork by strictly adhering to standard building codes and delivering exact tape-measure fractions.
Measuring Your Total Rise
Your Total Rise is the absolute vertical distance from the top of your lower finished floor to the top of your upper finished floor. Do not just measure between the framing—always account for the thickness of your final flooring materials (hardwood, tile, or sub-floor sheets) on both levels.
Understanding Building Codes (IRC vs. IBC)
This tool automatically adjusts the math based on your project type:
- Residential (IRC): The International Residential Code mandates a maximum riser height of 7 3/4 inches.
- Commercial (IBC): The International Building Code strictly caps maximum riser height at 7 inches to accommodate higher foot traffic and accessibility.
The “Top of Which Step?” Feature
If you are framing a staircase with an intermediate landing, you need to know exactly where that landing sits vertically. Simply enter the specific step number where your landing will be located, and the calculator will output the exact elevation from the bottom floor to the top of that specific tread.
