⚖️ 夏普比率计算器Sharpe Ratio Calculator
用 (组合收益率 − 无风险利率) ÷ 收益率标准差 计算夏普比率；可以直接输入年化收益和波动率，也可以粘贴每期收益率序列，自动年化后再计算。Work out the Sharpe ratio = (portfolio return − risk-free rate) ÷ standard deviation of returns — either from an annual return and volatility, or from a list of periodic returns that is annualised for you.
使用说明与常见问题How-to & FAQ
「夏普比率计算器」是什么？What is the Sharpe Ratio Calculator tool?
用 (组合收益率 − 无风险利率) ÷ 收益率标准差 计算夏普比率；可以直接输入年化收益和波动率，也可以粘贴每期收益率序列，自动年化后再计算。Work out the Sharpe ratio = (portfolio return − risk-free rate) ÷ standard deviation of returns — either from an annual return and volatility, or from a list of periodic returns that is annualised for you.
如何使用「夏普比率计算器」？How do I use the Sharpe Ratio Calculator tool?
在「夏普比率计算器」中，填写「输入方式」、「组合年化收益率（%）」、「年化波动率（标准差，%）」、「每年期数」、「无风险年利率（%）」等参数，结果会随输入实时计算并显示在下方。In the Sharpe Ratio Calculator: Fill in "Input", "Portfolio annual return (%)", "Annual volatility (standard deviation, %)", "Periods per year", "Risk-free annual rate (%)"; results are recalculated instantly as you type.
夏普比率怎么算？How is the Sharpe ratio calculated?
夏普比率 = (Rp − Rf) ÷ σp：组合收益率减去无风险利率得到超额收益，再除以收益率的标准差（波动率）。它衡量每承担一单位总风险能换来多少超额回报。Sharpe ratio = (Rp − Rf) ÷ σp: the portfolio return minus the risk-free rate (the excess return), divided by the standard deviation of returns (volatility). It measures how much excess return you get per unit of total risk.
收益率序列怎么年化？How is a return series annualised?
先算每期平均收益和样本标准差（除以 n − 1），再按每年期数 k 年化：年化收益 = 平均值 × k，年化波动率 = 标准差 × √k，最后与无风险年利率比较。这是常用的简单年化方法，不考虑复利。The mean and sample standard deviation (dividing by n − 1) per period are found first, then annualised with k periods per year: annual return = mean × k and annual volatility = standard deviation × √k, compared with the annual risk-free rate. This is the common simple annualisation, without compounding.
多少算好？What counts as good?
常见的经验参考是：小于 1 一般，1–2 较好，2–3 很好，3 以上极好。但数据期限太短、收益分布偏斜或有肥尾时，夏普比率可能误导。默认数据只是示例。A common rule of thumb: below 1 is modest, 1–2 good, 2–3 very good, above 3 excellent. A short history, skewed returns or fat tails can make the ratio misleading. The default data are only an example.
计算结果可以作为最终依据吗？Can I rely on the result?
「夏普比率计算器」按标准公式计算，结果仅供参考；实际金额以银行、券商或税务机关的规则和四舍五入方式为准。The Sharpe Ratio Calculator uses standard formulas and is for estimation only; actual figures depend on your bank, broker or tax authority's rules and rounding.
「夏普比率计算器」免费吗？需要注册吗？Is the Sharpe Ratio Calculator free? Do I need an account?
「夏普比率计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Sharpe Ratio Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.