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Calculating Total Run of Stairs
- After calculating the number of risers you will have, subtract 1 (this will tell you how many treads you will have)
- Multiply Risers (from step 1) by the tread depth. This is your total run.
Example: Total run for a set of stairs that will have 8 risers with a tread depth of 10".
- 8 - 1 = 7
- 7 x 10 = 70
(Total Run)
Example: Total rise is 27" and you would like to have a riser height of around 6".
- Total rise is 27"
- 27" divided by 6" = 4.5
- Since you cant have 4.5 risers, choose 4 or 5.
27 divided by 4 = 6.75
27 divided by 5 = 5.4" (6.75" is more desirable than 5.4")
Determining Riser Height
- Determine "Total Rise" by measuring the distance from the top landing area to the floor, sidewalk or deck surface below. (Consider any flooring to be installed later)
- Divide Total Rise by the desired riser height.
- If the result of step 2 is not a whole number, round up or down to the whole number. And again, divide the total rise by the new :whole number" to determine the riser height. (Remember to comply with codes)
(Based on 2006 IRC)
- Maximum Riser Height is 7-3/4".
- Minimum Tread Depth is 11".
- Riser Heights and tread depths should not differ from each other by more than 3/8".
- Minimum Head Room is 6'8"
- Landings must always be at least as wide as the tread depth.