STAIRS CALCULATIONS - USING THE TOTAL RUN
Example: You need to build a staircase where the measurement of the total run is 15 Feet.
Assume you are using the industry standard measurements for stair riser height (7-1/2 Inches), stair
tread width (10 Inches), oor thickness (10 Inches), and a headroom height of 6 Feet 8 Inches.
Find the following values:
KEY INPUT & DISPLAY
0
2. Enter the total run of the staircase:
RUN 15
Feet
0
Inch
R-HT 7-1/2
Inch
RSRS 19.
R+/- 0
Inch
T-WD 10
Inch
TRDS 18.
T+/- 0
Inch
OPEN 10
Feet
0
Inch
STRG 18
Feet
9
Inch
INCL 36.87˚
RUN 15
Feet
0
Inch
RISE 11
Feet
10-1/2
Inch
STORED
STORED
3. Use the “Stair Key” to calculate the measurements listed above and nd the total rise (or “ooor to
oor” height).:
Run
Stair
Stair
Stair
Stair
Stair
Stair
Stair
Stair
Stair
Stair
Stair
5
Feet
On/C On/C
1
riser height
number of risers
riser underage/overage
tread width
number of treads
tread overage/underage
Also, calculate the rise required for the staircase.
length of stairwell opening
stringer length
angle of incline.
1. Check that stored values are set to the correct desired measurements for riser height, tread width
oor thickness, and headroom height:
R-HT 7-1/2
Inch
T-WD 10
Inch
FLOR 10
Inch
HDRM 6
Feet
8
Inch
STORED
STORED
STORED
Conv Stor
Rcl
7
8
9
Rcl
Rcl
StorStor
Stor
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