This chart provides information important to your decision making.  By referencing the second column, select the weight which most closely matches your dog's weight.  The adjacent columns will list how long the product will last, the amount to feed each day, and the cost per day. The 2 lb. Free & Easy comes with  handy 1 gram & 5 gram measuring spoons.  The chart for the 8 oz.. Free & Easy is here.
 

Product Size Dog Weight (lbs) Product Duration (days) Amt. Per Day (grams) Cost Per Day
2 lb. 5 1613 0.56 $0.05
2 lb. 10 806 1.11 $0.11
2 lb. 15 538 1.67 $0.16
2 lb. 20 403 2.22 $0.21
2 lb. 25 323 2.78 $0.27
2 lb. 30 269 3.33 $0.32
2 lb. 35 230 3.89 $0.37
2 lb. 40 202 4.44 $0.43
2 lb. 45 179 5.00 $0.48
2 lb. 50 161 5.56 $0.53
2 lb. 55 147 6.11 $0.59
2 lb. 60 134 6.67 $0.64
2 lb. 65 124 7.22 $0.69
2 lb. 70 115 7.78 $0.75
2 lb. 75 108 8.33 $0.80
2 lb. 80 101 8.89 $0.85
2 lb. 85 95 9.44 $0.91
2 lb. 90 90 10.00 $0.96
2 lb. 95 85 10.56 $1.01
2 lb. 100 81 11.11 $1.07
2 lb. 110 73 12.22 $1.17
2 lb. 120 67 13.33 $1.28
2 lb. 130 62 14.44 $1.39
2 lb. 140 58 15.56 $1.49
2 lb. 150 54 16.67 $1.60