Think the Windows Calculator as a sort of "translator" between the human readable data (like the stats that you wan to change, for example, which is in decimal base) and the PS3 readable data (which is in hexadecimal base).
Let's suppose that you want to change the number of kills from your stats. In the game, that stat has a value of 67. Now, you need to find that 67 value in your save file in order to change it first. Once you've decrypted your save data, you must open it with a Hex Editor (there are a lot on the Web, just pick one).
In your hex editor, you will have a lot of numbers and letters, all from 0 to 9 and A to F, that's all the possible hexadecimal values. The next step is to find the location of the number of kills. Remember it was 67.
Now, in the Windows Calculator set it to Programmer mode, and pick the DEC option. Then, input the 67 value and you will see a
43 in the HEX row. That 43 in HEX is the value that you will need to look for in your hex editor.
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