1. Example of calculating PnL for the Coin-Margined Standard Futures

Transaction Direction: 1 refers to Long, -1 refers to Shorts.

Gross PnL= [Trade Size * Exchange Rate When Position Opens * (Closing Price-Opening Price) / Closing Price] / Exchange Rate When Position Closes
= Transaction Direction * Trade Size * Opening Price * (1 / Opening Price-1 / Closing Price)
Gross PnL Ratio = Transaction Direction * Trade Size * Opening Price * (1 / Opening Price-1 / Closing Price) / Margin
Net PnL = Transaction Direction * Trade Size *Opening Price * (1 / Opening Price-1 / Closing Price)-Trading Fee-Funding Fee

Please note: There is a characteristic for BTC/ETH Inverse Contract. When the price rises, the profit (loss) goes slow; when the price falls, the profit (loss) goes fast.When the price rises, the profit (loss) goes slow; when the price falls, the profit (loss) goes fast.

Examples are as follows:

Trade Size:10 BTC;Margin: 10 BTC; Leverage: 1X
1) If the price rises by 100%, the income is 50% (Transaction Direction: Long; BTC Price 100 → 200).
2) If the price rises by 100%, the loss is 50% (Transaction Direction: Short; BTC Price 100 → 200).
3) If the price falls by 50%, the loss is 100% (Transaction Direction: Long; BTC Price 100 → 50).
4) If the price falls by 50%, the income is 100%(Transaction Direction: Short; BTC Price 100 → 50).

Calculate with the example of 2) :
Gross PnL Ratio = Transaction Direction * Trade Size * Opening Price * 
(1 / Opening Price-1 / Closing Price) / Margin
 = -1 * 10 * 100 * (1/100-1/200) / 10
= -50%

🔼 Calculation of Forced-Liquidation for the Coin-Margined Standard Futures in Isolated-Margin mode. The example is based on the BTC-Margined Standard Futures.

When the Net PnL reaches -90%, the Forced-Liquidation will be triggered.

Calculation:

Liquidation Price = Transaction Direction * Trade Size * Opening Price / (0.9 * Margin + Transaction Direction * Trade Size - Trading Fee - Funding Fee)

Please note: Due to the difference in PnL, even with the same parameters, the Liquidation Price will be different between USDT-Margined orders and Coin-Margined orders.
For example: USDT-Margined, Long, 1x, Opening Price 100 USDT; Liquidation Price = 10 USDT.
BTC-Margined, Long, 1x, Opening Price 100 USDT; Liquidation Price = 52.63 USDT.

2. Forced Liquidation Rule for the Coin-Margined Standard Futures