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bcrypt cost guidelines based upon moose's law
Date Iterations Cost
1/1/2000 64 6
7/1/2001 128 7
1/1/2003 256 8
7/1/2004 512 9
1/1/2006 1,024 10
6/1/2007 2,048 11
1/1/2009 4,096 12
6/1/2010 8,192 13
1/1/2012 16,384 14
7/1/2013 32,768 15
1/1/2015 65,536 16
6/1/2016 131,070 17
1/1/2018 262,144 18
6/1/2019 524,288 19
1/1/2021 1,048,576 20
7/1/2022 2,097,152 21
1/1/2024 4,194,304 22
6/1/2025 8,388,472 23
1/1/2027 16,777,216 24
6/1/2028 33,553,843 25
1/1/2030 67,108,864 26
7/1/2031 134,217,728 27
1/1/2033 268,435,456 28
1/1/2035 536,870,912 29
1/1/2036 1,073,741,824 30
6/1/2037 2,147,437,008 31

Souced: http://security.stackexchange.com/questions/17207/recommended-of-rounds-for-bcrypt

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