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2x2xKit

Stair Calculator

Calculate riser height, total run and stringer length for a staircase.

How this is calculated
Riser height = total rise ÷ steps. Stringer length = √(rise² + run²)

Assumptions used in this calculation

  • Standard tread depth: Uses a default 10-inch tread depth (run) per step for the stringer length calculation, adjust if your actual tread depth differs.
  • Code compliance not checked: Doesn't validate riser height or tread depth against your local building code's minimum and maximum limits, always confirm against local code before building.

About this calculator

Calculates riser height from total rise and number of steps, total run from tread depth, and the stringer (diagonal) length a staircase requires.

Worked example

108in rise, 15 steps, 10in tread

Result: Riser height = 7.2in, stringer ≈ 184.8in

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