Calculating Kinetic Energy
For the purpose of computing kinetic energy, you should measure arrow speed one yard from the bow. Once you know arrow speed and arrow weight, apply the following formula: Arrow speed times arrow speed; times arrow weight; divided by 450,240, equals kinetic energy in foot-pounds.

Example: 240 fps x 240 fps = 57,600 x 500 grains = 28,800,000 divided by 450,240 = 63.965 foot-pounds of kinetic energy.
 
Typical Kinetic Energy Hunting Usage
Delivered Foot Pounds (DEP) at One Yard Downrange
  Arrow Velocity at One Yard Downrange
Arrow Total Weight - Grams   150 155 160 165 170 175 180 185 190 195 200 205 210 215 220 225 230 235 240 245 250 255 260 265 270
300 14.99 16.00 17.05 18.14 19.25 20.40 21.58 22.80 24.05 25.33 26.65 28.00 29.38 30.80 32.24 33.73 35.24 36.79 38.37 39.99 41.64 43.32 45.05 46.79 48.57
325 16.24
Small Game or Competition
 22.10 23.38 24.70 26.05 27.44 28.87 30.33 31.83 33.36 34.93 36.54 38.18 39.86 41.57 43.32 45.11 46.93 48.79 50.69 52.62
350 17.49 18.67 19.90 21.16 22.46 23.80 25.18 26.60 28.06 29.55 31.09 32.66 34.28 35.93 37.62 39.35 41.12 42.92 44.77 46.66 48.58 50.54 52.54 54.59 56.66
375 18.73 20.01 21.32 22.67 24.07 25.50
General Hunting or Big Game w/ Light Tackle
 38.50 40.31 42.16 44.05 45.99 47.97
Big Game
 54.15 56.30 58.48 60.71
400 19.98 21.34 22.74 24.18 25.67 27.20 28.78 30.40 32.07 33.78 35.53 37.33 39.17 41.06 42.99 44.97 46.99 49.06 51.17 53.32 55.52 57.76 60.05 62.38 64.76
425 21.23 22.67 24.16 25.69 27.27 28.90 30.58 32.30 34.07 35.89 37.75 39.66 41.62 43.63 45.68 47.78 49.93 52.12 54.37 56.66 58.99 61.37 63.81 66.28 68.81
450 22.48 24.01 25.58 27.21 28.88 30.60 32.38 34.20 36.08 38.00 39.97 42.00 44.07 46.20 48.37 50.59 52.87 55.19 57.56 59.99 62.46 64.99 67.56 70.18 27.86
475 23.73 25.34 27.00 28.72 30.48 32.30 34.18 36.10 38.08 40.11 42.19 44.33 46.52 48.76 51.06 53.40 55.80 58.26 60.76 63.32 65.93 68.60 71.31 74.08 76.90
500 24.98 26.68 28.42 30.23 32.09 34.00 35.98 38.00 40.08 42.22 44.42 46.66 48.97 51.33 53.74 56.22 58.74 61.32 63.96 66.65 69.40 72.21 75.07 77.98 80.95
525 26.23 28.01 29.85 31.74 33.69 35.71 37.77 39.90 42.09 44.33 46.64 49.00 51.42 53.90 56.43 59.03 61.68 64.39 Big Game Heavy Tackle 78.82 81.88 85.00
550 27.48 29.34 31.27 33.25 35.30 37.41 39.57 41.80 44.09 46.45 48.86 51.33 53.87 56.46 59.12 61.84 64.62 67.46 70.34 73.32 76.64 79.43 82.57 85.78 89.05
575 28.73 30.68 32.69 34.76 36.90 39.11 41.37 43.70 46.10 48.56 51.05 53.66 56.31 59.03 61.81 64.65 67.55 70.52 73.56 76.65 79.81 83.04 86.33 89.68 93.10
600 29.98 32.01 34.11 36.28 38.51 40.81 43.17 45.60 48.10 50.67 53.30 56.00 58.76 61.60 64.49 67.46 70.49 73.59 76.75 79.99 83.28 86.65 90.08 93.58 97.14
625 31.23 33.35 35.53 37.79 40.11 42.51 44.97 47.50 50.11 52.78 55.52 58.33 61.21 64.16 67.18 70.27 73.43 76.66 79.95 83.32 86.75 90.26 93.83 97.48 101.19
650 32.48 34.68 36.95 39.30 41.72 44.21 46.77 49.40 52.11 54.89 57.74 60.67 63.66 66.73 69.87 73.08 76.37 79.72 83.15 86.65 90.22 93.87 97.59 101.38 105.24
675 33.73 36.01 38.37 40.81 43.32 45.91 48.57 51.31 54.12 57.00 59.96 63.00 66.11 69.30 72.56 75.89 79.30 82.79 86.35 89.98 Toughest Game 105.28 109.29
700 34..89 37.35 39.80 42.32 44.93 47.61 50.37 53.21 56.12 59.11 62.18 65.33 68.56 71.86 75.24 78.70 82.24 85.85 89.55 93.32 97.17 101.09 105.09 109.18 113.33
725 36.23 38.68 41.22 43.83 46.53 49.31 52.17 55.11 58.13 61.22 64.41 67.67 71.01 74.43 77.96 81.51 85.18 88.92 92.75 96.65 100.64 104.70 108.85 113.07 117.38
750 37.47 40.02 42.64 45.35 48.14 51.01 53.97 57.01 60.13 63.34 66.63 70.00 73.46 77.00 80.62 84.33 88.11 1.99 95.94 99.98 104.11 108.31 112.60 116.97 121.43
775 38.72 41.35 44.06 46.86 49.74 52.71 55.77 58.91 62.13 65.45 68.85 72.33 75.90 79.56 83.31 87.14 91.05 95.05 99.14 103.32 107.58 111.92 116.36 120.87 125.48
800 39.97 42.68 45.48 48.37 51.35 54.41 57.56 60.81 64.14 67.56 71.07 74.67 78.35 82.13 85.99 89.95 93.99 98.12 102.34 106.65 111.05 115.53 120.11 124.77 129.53