Hello “gang”, I would like to share whit you my simple calculator. Just look my blog Pips calculator . I’m not good webdeveloper 
I just investing in forex and some time I make simple tools. But i belive “…there is nothing for free…” Because a know life. If you give someone something for free he does not appreciate it and lose motivation to keep going, keep action!. So just look my blog and if decide calculator is necessary for you take it! 
See you!