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Staircase Calculator

Calculate the number of steps, exact riser height, total run, stringer length, and angle of a straight staircase from the floor height.

About Staircase Calculator

A straight staircase is laid out by dividing the floor-to-floor height into equal risers. The number of risers is the total rise divided by the preferred riser height, rounded to a whole number, and the exact riser is the rise divided by that count. There is one tread fewer than risers. Total run is treads × tread depth, and the stringer length is the hypotenuse. The comfort rule 2 × riser + tread should fall between 600 and 650 mm.

How to use Staircase Calculator

  1. Fill in "Total rise, floor to floor", "Preferred riser height" and "Tread depth, also called going".
  2. The result appears below and updates as you type.
  3. Copy the result with the copy button, or download it as a file where that is offered.

Questions about Staircase Calculator

What riser and tread sizes are comfortable?

A common guide is a riser of 150 to 180 mm with a tread of 250 to 300 mm, checked with the rule that twice the riser plus the tread is 600 to 650 mm. Building codes set the legal limits, and they differ by country.

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