Calculating the Number
of Studs/Joists/Trusses
Find the number of 16 inch on-center (o.c.)
studs needed for a 18 feet 7-1/2 inch wall.
COMMENTS KEYSTROKES
Clear calculator [On/C] [On/C]
Enter length of wall 18 [Feet]
7 [Inch] 1 [/] 2
Divide by o.c. distance [÷] 16 [Inch] [=]
Answer: 13.96875 studs
Add one for each end [+] 1 [=]
Answer: 14.96875 (round to 15)
Similar uses apply to trusses and joists.
Masonry — Estimating Bricks
How many standard bricks (2-1/4” x 3-3/4” x
8”) with 1/2 inch joints are required for a wall
measuring 36 feet 6 inches long and 8 feet high?
COMMENTS KEYSTROKES
Clear calculator [On/C] [On/C]
Enter height of wall 8 [Feet]
Divide by brick height [÷] 2 [Inch] 3 [/] 4 [=]
Number high 34.90909
Store in Memory [M+]
Enter length of wall 36 [Feet] 6 [Inch]
Divide by brick length [÷] 8 [Inch] 1 [/] 2 [=]
Number wide 51.52941
Mult. for total bricks [x] [Rcl] [Rcl]* [=]
Answer: 1798.845
Add 5% for spoilage [+] 5 [%]
Answer: 1888.787 (inc. 5% spoilage)
* Be sure to clear Memory before proceeding to next
problem. [Rcl] [Rcl] was used here (instead of [Rcl] [M+])
as it automatically recalls and clears the value in the
Memory.
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