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stair rise calculator

Stair Riser Calculator

Get a first-pass riser count for planning a straight stair layout.

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Enter your values, then calculate.

Inputs stay in this browser. We record only an anonymous “tool used” event, never your values.

How it works

Riser count = total rise ÷ preferred rise, rounded up. Actual rise = total rise ÷ whole number of risers.

Three practical tips

  • Measure finished floor to finished floor.
  • Check headroom, tread depth and total run as one design.
  • Building requirements vary—verify your full layout locally.

Is this enough to design a staircase?

No. It is a planning estimate. Safe stairs also depend on going, pitch, headroom, landings, guarding and local rules.