I'm willing to risk about 20% of my account on any one day. I've had a few days where I took such a large hit. I've had quite a few more days where I made many times more than that. By changing my leverage %, I can change my risk pretty easilly. Lately, I have been risking much less per trade. I'm tired of the large account swings, but I still on occassion do risk that much. I also have 1 position on that is 40% of my equity currently, while another is about 25% of my equity. I am not in the slightest bit concerned with either of them. When they go up a few times over, they'll be much more of my equity I guess. That still won't bother me much. If you're right about something, not taking a large position is risking the loss of opportunity costs.