Seeing as you are a beginner, it might be better to start, bottom up. There are MUCH MUCH more sophisticated models and what follows is VERY basic. That being said, it seems many retail traders don't even do these basic calculations.
The priority is to not destroy your account so you can continue to learn and trade. Re-funding your account, is not a true solution either.
So the two questions are:
- How much do you risk in any one trade?
- How many trades can you lose in a row? I.e. full risk per trade * number of trades.
Here is an example:
On the system side,
- It can have a maximum draw down of 2.5K per trade. There is a Stop-Loss at that point.
- It appears that the worse case scenario is 4 trades in a row without a winner.
- It has a daily maximum loss of 2.5K/contract.
- All positions are closed by 1:15 PT
On the broker side:
- The Maximum loss in the account is set to 70%
- The Maximum numbers of contracts (futures) it can trade at one time is 3.
So as a working framework:
Acct Balance: $20,000
Broker Risk Setting: 70%
At Risk: $14,000
Contracts: 3
Max Drawdown/Contact: 2500
Total Max Drawdown: $7,500
Risk Ratio: 54% (7,500/14,000)
So this very basic (15 minutes of work) says to me it is OK to trade this system. Never mind the reward side, except to say the profit factor is over 2.
So now I have a low probability of blowing my account because:
- Any one day will not do it.
- Any one trade will not do it
- The broker will shut down the account if I go over the estimate (53%) by another 47%.
- I am confident in a orderly market where MKT orders work and markets don't close preemptively, it should be OK.*
This is so basic, but IMO, enough that I don't worry about it and I can concentrate on making the system better. I.e. it is not ideal, but tradable. Hope this helps. And by all means read up about it. But ultimately, keep it simple and focus on the trading after you know the big issues at least quantified. *In
disorderly markets all bets are off, but that is why I want the ratio to be around 50%.