Feet Inches [GE-9] - Boise Cascade
Technical Note
Feet & Inches on a Regular Calculator
Here's how to add up a string of dimensions on a regular calculator.
First, a convention for entering dimensions into your
calculator must be established. The tens, ones, and
decimal places are to be used for entering inches. The
hundreds, thousands, and all places to the left are to be
used for entering feet. Figure 1 illustrates the convention
for entering dimensions into your calculator. Some
examples of how various dimensions would be entered are
shown in the table below.
DIMENSION
CALCULATOR ENTRY
5-1/2"
5.5
2'-0"
200
20'-1"
2001
FEET
0000000.00 (calculator display)
INCHES
Figure 1
11-5/8"
11.625
127'- 8-7/8"
12708.875
To add up this string of dimensions:
Enter:
18'-5" + 2'-0" + 7'-2"
1805 + 200 + 702 = 2707 or 27'-7"
Now add 5'-6" to this result:
2707 + 506 = 3213 or 32'-13" or 33'-1"
There's a way to convert those excess inches into feet without having to do it in your head.
One foot is expressed as 100. Twelve inches is expressed as 12. Add the conversion factor
of 88 to 12 to express that dimension as one foot (88 + 12 = 100). The string of dimensions
above added up to 3213. Add the conversion factor to that total (3213 + 88) and get 3301
(33'-1") as the corrected result. What if the sum of your string of dimensions comes out to
4738 (47'-38")? Add the conversion factor three times to get 5002 (50'-2")!
This method works for subtracting dimensions as well. Subtract the conversion factor of 88
from the result to convert the excess inches to feet. If you're both adding and subtracting
dimensions, complete the conversion of excess inches before changing operations.
If you're adding up an especially long string of dimensions, you have to add the conversion
factor occasionally to keep the inches portion of your total from running over 99. That would
produce an error. Similarly, when subtracting a long string of dimensions, subtract the
conversion factor occasionally to keep the inches portion of your total from running below 12.
Tech Note GE-9
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