I am wondering if it is possible to reverse engineer the calculator on this url:


It appears to be a Joomla site with the Fabrik plugin driving the calculator. Some research suggests Fabrik uses Ajax, a language I know little about other than it is client-side calculation, so the source should be accessible(?)

Glad of anyone's help.

  • Why don't you just ask the owner for the script (i.e. me)?
    – user262170
    Commented Mar 17, 2016 at 21:12
  • Hi, and welcome to Reverse Engineering! Unfortunately, RE is not a forum, and the "Answer" box is for answers only. This could have a comment; once you have a bit of reputation, you can comment on posts. If you want to edit this into a proper answer, you can do so; else, it will probably get flagged for deletion.
    – Jongware
    Commented Mar 17, 2016 at 22:01
  • @user262170 are you serious? Apparently no provision for private messages on stackexchange: meta.stackexchange.com/questions/431/…
    – Bill Peet
    Commented Mar 22, 2016 at 21:57
  • @user262170 however I'd love to get my hands on it :)
    – Bill Peet
    Commented Mar 22, 2016 at 21:57

1 Answer 1


The algorithm is on the server-side (and executed via an HTTP POST to http://www.contrelec.co.uk/index.php/en/motor-full-load-current-estimator-kw), so you won't be able to directly extract the algorithm by just looking at the client-side HTML, JavaScript, etc.

However, since there are only 3 input variables, it shouldn't be too difficult to write a program to submit many values, extract the output, and then extrapolate the formula by graphing the results.

  • Thanks a lot @Jason, any pointers as to how to substitute values in programmatically?
    – Bill Peet
    Commented Sep 2, 2015 at 20:42
  • That would be a question for stackoverflow.com Commented Sep 2, 2015 at 21:05

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