Smilingsync is correct... there isn't enough info to provide a specific number.
Assuming you fill in the variables regarding you and your trading, here's the formula I use. I'll use your stated 90K for this example but you must keep in mind I am a daytrader and am flat by end of day, each and every day.
90000 (Acct Value) x .6 = 54000
54000 / 1575 = 34 contracts maximum simultaneously open across all instruments traded.
explanation:
The figure of 1575 represents 30% of exchange minimum margin for the instrument with the highest exchange minimum margin that I trade. For me, that's ER, which has exchange minimum margin of $5250. This calculation is used REGARDLESS of INTRADAY minimums offered by my broker, or whether or not the base-line instrument is actually traded that day.
Keep in mind, I am a daytrader. I am flat by the end of day. The only thing I hold overnight is cash! For those thinking this calculation is too aggressive I'll just tell ya that as a daytrader, there are only 2 ways that a single trade would be allowed to go against me 1575 per contract. The first is an INTRADAY GAP, but I'll ask you this... when was the last time ES GAPPED 31 handles, 126 ticks actually, INTRADAY?? The second is I drop dead at the switch. In this case the position would be at least partially closed out by the broker due to overnight margin requirements. Combined with the fact that (most) futures-only brokers make actual contact with clients when accounts require broker intervention, the probabilities are very high my loved ones would receive enough money from the account to give me proper farewell. Recall, only 60% of the account value is used in the initial calculation.
For the record, as exchange minimum margins change so does my calculation. Earlier this year I used flat figures of 1000 and 1250 per contract, again regardless of broker intraday offerings. As volatility increased, so did my self-imposed requirement.
Osorico
Assuming you fill in the variables regarding you and your trading, here's the formula I use. I'll use your stated 90K for this example but you must keep in mind I am a daytrader and am flat by end of day, each and every day.
90000 (Acct Value) x .6 = 54000
54000 / 1575 = 34 contracts maximum simultaneously open across all instruments traded.
explanation:
The figure of 1575 represents 30% of exchange minimum margin for the instrument with the highest exchange minimum margin that I trade. For me, that's ER, which has exchange minimum margin of $5250. This calculation is used REGARDLESS of INTRADAY minimums offered by my broker, or whether or not the base-line instrument is actually traded that day.
Keep in mind, I am a daytrader. I am flat by the end of day. The only thing I hold overnight is cash! For those thinking this calculation is too aggressive I'll just tell ya that as a daytrader, there are only 2 ways that a single trade would be allowed to go against me 1575 per contract. The first is an INTRADAY GAP, but I'll ask you this... when was the last time ES GAPPED 31 handles, 126 ticks actually, INTRADAY?? The second is I drop dead at the switch. In this case the position would be at least partially closed out by the broker due to overnight margin requirements. Combined with the fact that (most) futures-only brokers make actual contact with clients when accounts require broker intervention, the probabilities are very high my loved ones would receive enough money from the account to give me proper farewell. Recall, only 60% of the account value is used in the initial calculation.
For the record, as exchange minimum margins change so does my calculation. Earlier this year I used flat figures of 1000 and 1250 per contract, again regardless of broker intraday offerings. As volatility increased, so did my self-imposed requirement.
Osorico

