Page 27
STAIR CALCULATIONS - USING RISE AND RUN
Example: You are building a staircase that has a oor-to-oor height of 12 Feet 10 Inches and a run of
18 Feet 6 Inches.
KEY INPUT & DISPLAY
0
1. Enter rise and run:
RISE 12
Feet
10
Inch
R-HT 7-5/16
Inch
*
2. Use the “Stair Key” to calculate the measurements
RSRS 21.
R+/- - 0-7/16
Inch
T-WD 11-1/8
Inch
RUN 18
Feet
6
Inch
TRDS 20.
T+/- 0-1/2
Inch
OPEN 11
Feet
4-15/16
Inch
STRG 22
Feet
2-1/4
Inch
INCL 33.32˚
RUN 18
Feet
6
Inch
RISE 12
Feet
10
Inch
R-HT 7-1/2
Inch
T-WD 10
Inch
HDRM 6
Feet
8
Inch
FLOR 10
Inch
*A in the display means that the calculated riser height exceeds the stored desired riser height.
For example, if you were to get a calculated riser height of 7-3/4 Inches when the stored desired height is 7/12 In.
STORED
STORED
STORED
STORED
STORED
STORED
riser height
number of risers
riser underage/overage
tread width
number of treads
tread overage/underage
length of stairwell opening
stringer length
angle of incline.
On/C
Rise
Run
Feet
Inch
1 2 1
1
Feet Inch
Stair
Stair
Stair
Stair
On/C
Stair
Stair
Stair
Stair
Stair
Stair
Stair
Stair
Stair
Stair
Stair
8
6
0