If I am understanding you correctly, the value displayed for the formula is in pieces. If the user enters a value in 50 or 51 that number is in pieces so the appropriate formula would be =A50. Then you can sum the column to get total pieces.

The user would enter inches in lines 45-49...SO:

Line 45 User puts in 10...That 10 would have to be (sorry, screwed up) divided by 12 to get feet and then multiplied by 227 (pieces per foot)... so, 10(user added #)/12*227, also rounded = 189.6667 to 189

Line 45 10(user input inches)/12*227 = 189 which is rounded to the nearest whole #

Line 46 15(user input inches )/12*227 = 284 which is rounded to the nearest whole #

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Line 50 User Inputs pieces here 100

Line 51 User Inputs pieces here 122

Total 695

I really tried to make this simple...