Calculate stair rise, run, number of treads, stringer length and angle for any residential staircase to code.
🪜 Stair Calculator
Number of Risers
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Rise Per Step
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Stringer Length (ft)
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💡 Pro Tip
Consistent rise height is critical for stair safety. Varying the rise by even 3/8 inch from step to step is a code violation and creates a trip hazard.
Frequently Asked Questions
Q: What is the standard rise and run for stairs?
IRC building code requires a maximum 7.75 inch rise (vertical height) and minimum 10 inch run (horizontal depth) per step for residential stairs.
Q: How many steps do I need for a 10 foot elevation change?
At 7.5 inch rise: 10 ft = 120 inches ÷ 7.5 = 16 steps (risers). The number of treads is always one less = 15 treads.
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