For those traders that day trade futures successfully I was wondering if you would be willing to share your position sizing strategies. I think position sizing is perhaps one of the keys to successful trading long term. How do you decide the size of your positions. I guess there could be a number of different approaches to this question. (1) On the basis of overall market conditions. IE we are in a downtrend on the daily chart so you take larger size on your sell positions than your buy positions. (2) On the basis of overall net equity. You are having a good month so at some point you increase your position size as you are playing with the house's money. (3) On the basis of probability of win or loss. Some of your tradesetups are higher probability than others so you trade more contracts on the higher probability setups. (4) Scaling in. As a position moves in your favour you add more contracts. If I have left out any other ways to position size please add and please share your experiences with what your position sizing approach is and how it has worked for you. Cheers.