Question!

Your broker should provide you with the margin requirements for the futures contract(s) you wish to trade. That's the bare minimum. You should probably have a multiple of that amount in your account to start.
 
In addition to margin you must account for drawdown of your strategy. The formula is:

Capital = margin per contract + max. expected drawdown.

In case you do not cover any drawdown you will be liquidated by the broker.
 
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