Get the exact number of steps, precise riser height, tread run and stringer length for a comfortable, code-friendly staircase.
Most codes and comfort guidelines recommend 7–7.75 inches for residential stairs, giving a natural, safe stride.
Stringer length is the hypotenuse of the total rise and total run — this calculator applies the Pythagorean theorem automatically.
The total rise must divide evenly across a whole number of steps, so the actual riser height is fine-tuned slightly from your target to keep every step equal.