TrusCalc uses the common truss-design ffiiss format: feet, inches, sixteenths. Just type the numbers—no feet, inch, or fraction symbols.
22
22'-0"
104
1 1/4"
10608
1'-6 1/2"
50112
5'-1 3/4"
240800
24'-8"
1040815
104'-8 15/16"
Quick rule: the last two digits are sixteenths, the two before those are inches, and everything to the left is feet. Whole-foot entries such as 22 are simply entered as 22.