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# 收益率计算
收益率是指交易账户在特定期间内产生的盈利或亏损，以百分比表示。收益率反映账户净值的变化，不受入金和提款影响。
正收益率表示盈利，负收益率表示亏损。
**计算公式**
系统会针对两次余额操作之间的期间计算收益率。余额操作包括入金、提款或内部转账等。
计算公式如下：
`Return = Equity_end / Equity_start`
其中：
* **Equity\_start** 是某一期间开始时的账户净值，即完成余额操作后的账户净值。
* **Equity\_end** 是该期间结束时的账户净值，即执行下一次余额操作前的账户净值。
Return by periods
多个期间的收益率通过将各期间的收益率相乘计算：
`Return = Return P1 × Return P2 × Return P3 × … × Return Pn`
如需将计算得出的收益率比值转换为百分比，请使用以下公式：
`Return (%) = (Return - 1) × 100`
**示例**
假设一名交易员创建了一个主账户，并向该账户存入 $500。
在下一次余额操作之前，账户净值从 $500 增加至 $1,800。
**期间 1**的收益率计算如下：
`Equity_start = $500`
`Equity_end = $1,800`
`Return P1 = 1,800 / 500 = 3.6000`
`Return P1 (%) = (3.6000 - 1) × 100 = 260.00%`
之后，交易员再次存入 $400。假设在下一次余额操作之前，账户净值增加了 $800。
**期间 2**的收益率计算如下：
`Equity_start = $1,800 + $400 = $2,200`
`Equity_end = $2,200 + $800 = $3,000`
`Return P2 = 3,000 / 2,200 = 1.3636`
`Return P2 (%) = (1.3636 - 1) × 100 = 36.36%`
随后，交易员提取 $500。假设在下一次余额操作之前，账户净值没有发生变化。
**期间 3**的收益率计算如下：
`Equity_start = $3,000 - $500 = $2,500`
`Equity_end = $2,500`
`Return P3 = 2,500 / 2,500 = 1`
`Return P3 (%) = (1 - 1) × 100 = 0%`
三个期间的总收益率计算如下：
`三个期间的收益率 = 3.6000 × 1.3636 × 1 = 4.9090`
`三个期间的收益率 (%) = (4.9090 - 1) × 100 = 3.9090 × 100 = 390.90%`
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