What the tool does, how to run it, and what to expect from the result.
Divide the total rise by the maximum riser height and round up: 108 ÷ 7.75 = 13.9, so 14 risers of 108 ÷ 14 = 7.71 in. There is one fewer tread than risers: 13 × 10.5 in = 136.5 in of run. The stringer is the hypotenuse, √(108² + 136.5²) = 174 in. The IRC allows risers up to 7¾ in and treads from 10 in.
A quick way to understand who this helps, what it solves, and where it connects next.
Homeowners, DIYers and contractors estimating materials before a store run.
Using the stair calculator without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
A common rule is 2 × riser + tread = 24-25 in. A 7.5 in riser with a 10 in tread fits.
The top floor itself is the last step, so it needs a riser but no tread.
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Enter your numbers and the result updates live in your browser. Nothing is uploaded and no server is used.
Checks against IRC R311.7.5 (max riser 7¾", min tread 10"). Local codes can differ.