Details about your positions can be seen on Trade pages or on your Positions page. There are three metrics that are worth explaining in greater detail:
- PnL: how much money you have made or lost on this product since you were last flat.
- Average Open Price: Average price at which you opened (bought if you are long, sold if you are short) since you were last flat.
- Break-Even Price: the price at which you'd have to close your position to break even since you were last flat.
PnL
PnL = Sum(current mark price - fill price) * fill size * (-1 if sell, 1 if buy) for all the fills since you were last flat.
Your percentage PnL for futures is PnL / position size.
You can find a summary of your historical PnL here.
Average Open Price
This is the weighted average of the price of your opening fills since you were last flat.
Opening Fills = all fills that were opening (buying if you are currently long, selling if you are currently short) since you were last flat.
Opening Size = Sum(fill size) for all Opening Fills.
Opening Cost = Sum(fill price * fill size) for all Opening Fills.
Average Open Price = Opening Cost / Opening Size
Break-Even Price
Opening Fills = all fills that were opening (buying if you are currently long, selling if you are currently short) since you were last flat.
Opening Size = Sum(fill size) for all Opening Fills.
Opening Cost = Sum(fill price * fill size) for all Opening Fills.
Closing Fills = all fills that were closing (selling if you are currently long, buying if you are currently short) since you were last flat.
Closing Size = Sum(fill size) for all Closing Fills
Closing Proceeds = Sum(fill price * fill size) for all Closing Fills
Break-Even Price = (Opening Cost - Closing Proceeds) / (Opening Size - Closing Size)
As an example, suppose you made the following trades:
- BUY 11 BTC-PERP at $10,000
- SELL 1 BTC-PERP at $12,000
Your sale was $2,000 higher than your buys, and so you can lose $200 selling each of 10 BTC-PERP you have open without losing money overall. This implies a break-even price of $9,800. Notice that the above formula gives the same number:
Opening Size = 11 BTC-PERP
Opening Cost = (11 BTC-PERP) * ($10,000 / BTC-PERP) = $110,000
Closing Size = 1 BTC-PERP
Closing Proceeds = (1 BTC-PERP) * ($12,000) = $12,000
Break-Even-Price = ($110,000 - $12,000) / (11 - 1) = $9,800
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