I'm trying to figure out if my strategy is actually viable or if it gets cut to ribbons on commissions. I haven't actually traded forex yet, and I get caught up on the math. It's not so much the math itself but the terms that mix me up. I was trying to interpret Dukascopy's rates and came up with something like this. I hope somebody could confirm or correct my math. I would be curious about how to factor other brokers into this, and see if I could be doing much better. Let's say I'm doing nano lots. I don't know if I can do nano with Dukascopy, but I'm just picking something. Let's also say I want to use $100k USD, with some to spare for commissions. I'm trading EURUSD and want to open a long position at, say, 1.34866. I am trying to leverage 1:30. Let's also assume I have sufficient money deposited to cover margin; I don't want to get into how much quite yet. $100k USD means I can command $3M. USD Divided by my current rate of 1.34866 that's 2224430.165EUR. That would be 22244 nano lots. In Dukascopy's formula, assuming >= 50,000 in their account, it looks like the commission is $18USD per $1M. I assume due to leverage then that I'm paying for that $3M. I assume then that means my commission is $18 USD/$1M USD * 3M USD = $54USD for that position. Is that right? If so, is that just one way? I can kind of understand given the volumes of money involved, but it does mess me up if that is true. I wonder how commissions work that are on the spread? My strategy looks like it works if I assume I always get the worst price in the spread upon entering and exiting. Do brokerages that work on spread have something that makes it even more difficult than that?