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# Kelly Calculator

Discussion in 'Strategy Building' started by 15rms, Sep 17, 2013.

1. ### 15rms

Does anybody here have a good web site that has a Kelly calculator? I am looking for a web site that I can just fill in the percent winning trades and the average win average loss.

Thanks

2. ### drcha

I have not seen one or looked for one, but...why do you need one? By the time you calculate the % return for wins and losses, you are most of the way there:

k = (((1+r)*p)-1)/r

where r = mean % return on wins/mean % return on losses

and p = probability of a win

Assuming you risk the same amount or % on each trade

3. ### 15rms

Ok Thank You.

4. ### drcha

Nice description of this calculation and others like it in McMillan on Options by Larry McMillan

5. ### bustermu

15rms,

Once you have reduced the information to, "percent winning trades and the average win average loss", only, the Kelly Ratio can no longer be determined.