## Monday, March 7, 2011

### The Cost of Linux

Well, the numbers on the current cost of Linux on Wikipedia were a bit out of date, so I thought that I would create a post purely of calculations that my edit could link to so that people could check the calculations themselves. I realize that a blog is not a reliable source, however this is solely an archive of my calculations plugging current numbers into the calculations that are currently linked to on Wikipedia.

Original Calculations:
MM-nominal-semidetached = 3*(KSLOC)^1.12 =
= 3* (4287.449)^1.12 = 35,090 MM
Effort-adjustment =  1.15 * 1.0 * 1.65 * 1.11 * 1.0 * 1.15 *
1.0 * 0.86 * 1.0 * 0.86 * 1.0 * 0.95 * 0.91 * 1.0 * 1.0
= 1.54869
MM-adjusted = 35,090 * 1.54869 = 54,343.6 Man-Months
= 4,528.6 Man-years of effort to (re)develop
If average salary = \$56,286/year, and overhead = 2.40, then:
Development cost = 56286*2.4*4528.6 = \$611,757,037

Current:
MM-nominal-semidetached = 3*(KSLOC)^1.12 =
= 3* (13996.612)^1.12 = 132 029 MM
Effort-adjustment =  1.15 * 1.0 * 1.65 * 1.11 * 1.0 * 1.15 *
1.0 * 0.86 * 1.0 * 0.86 * 1.0 * 0.95 * 0.91 * 1.0 * 1.0
= 1.54869
MM-adjusted = 132 029 * 1.54869 = 204 472 Man-Months
= 17 039.3326675 Man-years of effort to (re)develop
Median Wage
If average salary = \$69 620/year, and overhead = 2.40, then:
Development cost = 69 620*2.4*17 039.4 = \$2 847 079 267.20
Mean Wage
If average salary = \$73 470/year, and overhead = 2.40, then:
Development cost = 73 470*2.4*17 039.4 = \$3 004 523 323.20