# 如何使用MDEX合約計算器

用戶可以使用MDEX合約計算器，來計算每個委托的起始保證金，收益和回報率。

1.點擊【計算器】圖標，如下圖。

<figure><img src="/files/4YktG1rApWx9297UDvyL" alt=""><figcaption></figcaption></figure>

2.用戶可以使用計算器來計算【收益】、【目標價格】或【強平價格】。

<figure><img src="/files/eEFslkOBBw5wAkh0RUj9" alt=""><figcaption></figcaption></figure>

3.選好選項後用戶可以選擇【做多】或【做空】，輸入開倉價格、平倉價格和成交數量。此外，您也可以靈活調整杠桿倍數。填寫完成後，點擊【計算】。MDEX就會自動計算起始保證金、收益及回報率。

#### USDT永續合約

&#x20;起始保證金=開倉數量 x 開倉價格 x 起始保證金率

起始保證金率=1/杠桿倍數

收益計算：

多單=（平倉價格-開倉價格）x 開倉數量

空單=（開倉價格-平倉價格）x 開倉數量

回報率=收益/起始保證金=方嚮 x （1-開倉價格/平倉價格）/起始保證金率


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