How to calculate the average MER (margin to equity ratio)? Assume that I open a futures account with a FCM and I deposit $100,000 in my account. Each business day, I will have some following information for my account: 1. My account equity balance daily --- Initially, it will be $100,000. But after that, it will change virtually every day if there is positions and if I take interest, etc into consideration, etc. 2. The total of margin used daily --- It is the sum of all margin (performance bonds) for all position daily. If there is no long/short position, the total of margin used for such day will be 0. 3. Based on 1 and 2 above, I can calculate the MER (margin to equity ratio) per each business day (MERD). MERD = (the total of margin used daily)/(my account equity balance daily). 4. Assuming there is 252 business days, I will have 252 MERD (from MER1 to MER252) for my account for any year. Question I have is that now I have 252 MERD (MER1 to MER252), how do I calculate the average MER for the year? A. The average MER is the average of all MERD. MER = (MER1 + MER2 + â¦ + MER252)/252 B. Or other method? Is option A above correct? Or there are some other ways to do it?