As an intraday-only hi-freq index futures trader (YM is my primary instrument, followed by ER2 and NQ), I use a simple formula...
((AcctValue * .6) / 1000)
I use $1000 margin per contract, although my broker allows me half that. Using an example 10K account, this calc allows max size of 6 simultaneously open contracts INTRADAY. Technically, in this example, my broker would allow 20 simultaneously open positions.
It's important to realize that in this example, 6 simultaneously open positions is the max. That doesn't mean minimum, average, or necessarily normal. Just because you qualify for a million dollar mortgage doesn't mean you have to buy a million dollar house.
You must consider the tic value and trading characteristics of your traded instrument, as well the the reasoning and expectancy of a trade in order to determine an appropriate size for a given trade. Is max size what you want to do before Fed minutes? The tic value, trading characteristics, reasoning, expectancy, and your tolerance for loss will dictate.
And that brings me to JJ's post. IMO, it is wrong to use "generic stops", let alone stops based on overall trade style. Generic risk management as posted by JJ is useful only as catastrophe insurance. Other than that, each and every trade must stand on it's own. With it's own set of risk management. Every trade is entered into based on a unique set of MOMENTARY data. Use of generic stops is lazy risk/money management at best. Like the above mortgage trope, just because you have a stop in place, catastrophic or otherwise, doesn't mean that's the only way to exit a trade.
Osorico
