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I have a futures trading strategy and want to calculate the daily return. I need this to get the Sharpe ratio of that strategy.

The daily return of my strategy should be:

                      EOD position value + cash
return = -----------------------------------------------
         yesterdays EOD position value + yesterdays cash

What is the formula to calculate the cash value of my trading account (with regards to margin etc.)?

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According to https://www.quora.com/How-does-one-calculate-returns-on-a-futures-contract/answer/Joe-Fallico the formula should be:

         (price today - price yesterday) x dollar equivalent for a price move of one tick 
return = --------------------------------------------------------------------------------
          margin requirement per contract
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Subtract yesterday's position value from today's position value. Then divide that result by the the time-weighted average of year-to-date deposits and withdrawals plus the beginning year account value. Well, I think a software is needed. I recommend 'KBH Investor Accounting' but if the previous day's gain or loss is to also be considered in the time-weighted deposit/withdrawal balance then the software does not offer that method.

I suppose that "position value" is the contract-size times the current price and actually times the number of contracts. Of course a position begins with an opening price and ends with a closing price.

Well, with futures, each ending day is a closing price and each opening day is a new opening price. There's a daily account statement with mark-to-market accounting. The statement has a cash-balance that nets with payments/receipts, with realized gains/loss, with fees, and with commissions to produce a new-cash-balance. So just net the realized gain/loss with the commissions and that's the daily trading gain/loss.

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