Password Strength - Wikipedia
Entropy Bits Formula
log N / log 2
N is the number of possible symbols in set
#PowerShell [math]::log($N)/[math]::log(2)Entropy Table to 256 Bits
Set Count Bits Per Char Set Characters 10 3.322 numeric 0-9 26 4.7 case insensitive alpha a-z 36 5.17 case insensitive alphanumeric a-z, 0-9 52 5.7 case sensitive alpha a-z, A-Z 62 5.954 case sensitive alphanumeric a-z, A-Z, 0-9 94 6.555 ascii characters a-z, A-Z, 0-9, symbols 95 6.57 ascii characters a-z, A-Z, 0-9, symbols including space Len N=10 N=26 N=36 N=52 N=62 N=94 N=95 1 3.322 4.7 5.17 5.7 5.954 6.555 6.57 2 6.644 9.401 10.34 11.401 11.908 13.109 13.14 3 9.966 14.101 15.51 17.101 17.863 19.664 19.71 4 13.288 18.802 20.68 22.802 23.817 26.218 26.279 5 16.61 23.502 25.85 28.502 29.771 32.773 32.849 6 19.932 28.203 31.02 34.203 35.725 39.328 39.419 7 23.253 32.903 36.189 39.903 41.679 45.882 45.989 8 26.575 37.604 41.359 45.604 47.634 52.437 52.559 9 29.897 42.304 46.529 51.304 53.588 58.991 59.129 10 33.219 47.004 51.699 57.004 59.542 65.546 65.699 11 36.541 51.705 56.869 62.705 65.496 72.1 72.268 12 39.863 56.405 62.039 68.405 71.45 78.655 78.838 13 43.185 61.106 67.209 74.106 77.405 85.21 85.408 14 46.507 65.806 72.379 79.806 83.359 91.764 91.978 15 49.829 70.507 77.549 85.507 89.313 98.319 98.548 16 53.151 75.207 82.719 91.207 95.267 104.873 105.118 17 56.473 79.907 87.889 96.907 101.221 111.428 111.688 18 59.795 84.608 93.059 102.608 107.176 117.983 118.257 19 63.117 89.308 98.229 108.308 113.13 124.537 124.827 20 66.439 94.009 103.399 114.009 119.084 131.092 131.397 21 69.76 98.709 108.568 119.709 125.038 137.646 137.967 22 73.082 103.41 113.738 125.41 130.992 144.201 144.537 23 76.404 108.11 118.908 131.11 136.947 150.756 151.107 24 79.726 112.811 124.078 136.811 142.901 157.31 157.677 25 83.048 117.511 129.248 142.511 148.855 163.865 164.246 26 86.37 122.211 134.418 148.211 154.809 170.419 170.816 27 89.692 126.912 139.588 153.912 160.763 176.974 177.386 28 93.014 131.612 144.758 159.612 166.717 183.528 183.956 29 96.336 136.313 149.928 165.313 172.672 190.083 190.526 30 99.658 141.013 155.098 171.013 178.626 196.638 197.096 31 102.98 145.714 160.268 176.714 184.58 203.192 203.666 32 106.302 150.414 165.438 182.414 190.534 209.747 210.235 33 109.624 155.115 170.608 188.115 196.488 216.301 216.805 34 112.946 159.815 175.777 193.815 202.443 222.856 223.375 35 116.267 164.515 180.947 199.515 208.397 229.411 229.945 36 119.589 169.216 186.117 205.216 214.351 235.965 236.515 37 122.911 173.916 191.287 210.916 220.305 242.52 243.085 38 126.233 178.617 196.457 216.617 226.259 249.074 249.655 39 129.555 183.317 201.627 222.317 232.214 255.629 256.224 40 132.877 188.018 206.797 228.018 238.168 262.184 41 136.199 192.718 211.967 233.718 244.122 42 139.521 197.418 217.137 239.418 250.076 43 142.843 202.119 222.307 245.119 256.03 44 146.165 206.819 227.477 250.819 45 149.487 211.52 232.647 256.52 46 152.809 216.22 237.817 47 156.131 220.921 242.986 48 159.453 225.621 248.156 49 162.774 230.322 253.326 50 166.096 235.022 258.496 51 169.418 239.722 52 172.74 244.423 53 176.062 249.123 54 179.384 253.824 55 182.706 258.524 56 186.028 57 189.35 58 192.672 59 195.994 60 199.316 61 202.638 62 205.96 63 209.281 64 212.603 65 215.925 66 219.247 67 222.569 68 225.891 69 229.213 70 232.535 71 235.857 72 239.179 73 242.501 74 245.823 75 249.145 76 252.467 77 255.788 78 259.11
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