How far apart should stair stringers be?

Space stringers no more than 16 in on center for 5/4 treads, 12 in for heavier loads.

What size lumber for stringers?

Use 2×12 lumber so enough material remains after notching.

Enter the rise and run to calculate the diagonal stringer length and the number of stringers you need.

Estimates only. Round up and buy a little extra to account for waste, spills, and breakage.

Stringer length = √(total rise² + total run²). Use one stringer every ~16 in of stair width plus one.

How far apart should stair stringers be?: Space stringers no more than 16 in on center for 5/4 treads, 12 in for heavier loads.
What size lumber for stringers?: Use 2×12 lumber so enough material remains after notching.

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