Free Stair Calculator
Rise, run, and stringer length for a staircase.
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Inputs
Result
Number of steps
14
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Short answer
Rise, run, and stringer length for a staircase.
What is the Stair Calculator?
Rise, run, and stringer length for a staircase.
How does the Stair Calculator work?
Enter the inputs above and read the result.
Formula
Variables
HTotal riseRunTread depth
Explanation
IRC limits rise to 7¾ in and requires run ≥ 10 in.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Stair Calculator sits inside the Construction Calculators hub, in the structures & exteriors cluster. Framing, roofing, fencing and outdoor work. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Stair
Rise, run, and stringer length for a staircase. Within construction calculators, stair belongs to the structures & exteriors cluster, where it shares terminology and assumptions with closely related tools.
Learning how stair is calculated
IRC limits rise to 7¾ in and requires run ≥ 10 in. Working through the variables one at a time — H, Run — makes the result reproducible by hand and easier to sanity-check.
Using stair to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How stair compares with related measures
on-centre spacing, pitch, linear feet, span all describe adjacent aspects of structures & exteriors. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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