To calculate your syrup yield in lbs per tap, start with your total number of gallons of syrup. Multiply by 11 (there are 11 lbs in 1 gallon of syrup). Divide that by your number of taps.
Example below:
50 gal syrup produced x 11 lbs/gal = 550 lbs of syrup.
550 lbs of syrup / 150 taps = 3.67 lbs of syrup/tap
Alternatively, you can take the number of gallons of syrup per tap and multiply by 11. So in the example above:
50 gal syrup / 150 taps = 0.33 gal syrup/tap x 11 lbs/gal = 3.67 lbs/tap