Spike's Calculators


Stair Design Calculator

This calculator calculates riser height from total height and number of risers and provides results for slope, rise and run ratio's, total run of the stairs, stringer length and the minimum required floor opening.

Stair Design Calculator

Stair Calculator

Total Rise ft in n
Number of Risers #
Run in n
Dimension of Nosing in n
Floor Thickness in n
Required Headroom ft in


Total Rise in Inches in
Height of Riser in
Stair Slope °
Rise plus Run Equals in
Two Rise plus One Run Equals in
Rise Times Run Equals in
Total Run ft in
Stringer Length ft in
Floor Opening ft in

The Calculation

  1. enter the total rise from floor to floor
  2. number of risers you wish to calculate for
  3. unit run ( length of one run)
  4. nosing, the amount the stair tread projects passed the vertical riser below
  5. thickness of floor structure (floor finish material plus joist plus plywood plus ceiling finish)
  6. required headroom, as per building code / or the desired headroom

The Results

  1. the total rise in inches
  2. the height of one riser
  3. the slope of the stairs
  4. sum of ratio
  5. sum of ratio
  6. sum of ratio
  7. the total run of your stairs
  8. stringer length
  9. floor opening size
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