Stringer Length Calculator
Calculate the length of a stringer from the total rise, the number of risers and known run of one tread.
The number of Risers
To see the number of risers, divide the total rise by a riser height that works for you. For instance, convert this to a decimal if you like a 7 1/2" riser. 7 1/2" = 7 + 1 ÷ 2 = 7.5 inches.
Do the same for the total rise, converting it to decimal. Close counts. It can be less than 100% accurate. The total rise = 8'- 2 1/4", then multiplying the 8 x 12 = 96 inches and adding 2 for a total rise of 98 inches. Then 98 ÷ 7.5 = 13 (rounded). Entering 13 for the number of risers is a good start.
Length of a Stair Stringer Calculator
The Calculation
- enter total rise in feet inches and fraction of an inch
- enter the number of risers you wish to calculate for
- enter the run (depth of one tread, minus the nosing), in inches and fraction of an inch
The Results
- total rise converted to inches
- the height of one riser
- total run of stairs
- the length of the stringer
Example:
The height from top of floor to top of next floor has a total rise of 9 feet 1 and ½ inches
the number of risers you are calculating for is 14
the depth of one tread (run) minus the nosing is 9 and ⅝ inches
The Results
the total height of 9' 1 ½" converted to inches is 109 ½ inchesthe height (rise) of each tread is 7 13/16 inches
the total run of the stairs is 10 feet 5 and ¼ inches
the length of the stringer is 13 feet 5 and ¼ inches
Stair Framing
- Advanced Staircase
- Angle of the Stairs
- Stair Riser Height
- Rough Framing, Stairs Material Plus Cost
- Number of Stair Risers Based on Building Code
- Number of Stair Risers Based on Building Code (Metric)
- Simple Stairs
- Stair Design Calculator
- Stair Slope in Degrees and Rise and Run Relationships
- Stair Well Floor Opening Size
- Stringer Length Calculator