# Sharpe Ratio Calculator

Calculate the Sharpe ratio to measure risk-adjusted investment returns. Compare excess return to portfolio volatility and evaluate investment performance.

## What this calculates

Measure how well your portfolio compensates you for the risk you take. The Sharpe ratio divides excess return (above the risk-free rate) by the portfolio's standard deviation. A higher Sharpe ratio means better risk-adjusted performance.

## Inputs

- **Portfolio Return (%)** (%) — min -100, max 1000 — Annualized portfolio or investment return.
- **Risk-Free Rate (%)** (%) — min 0, max 50 — Current risk-free rate (e.g., 10-year Treasury yield).
- **Portfolio Std. Deviation (%)** (%) — min 0.01, max 200 — Annualized standard deviation of portfolio returns.

## Outputs

- **Sharpe Ratio** — Risk-adjusted return measure. Higher is better.
- **Excess Return** — formatted as percentage — Portfolio return minus the risk-free rate.
- **Risk Assessment** — formatted as text — Qualitative rating based on the Sharpe ratio.

## Details

The Sharpe ratio, developed by Nobel laureate William Sharpe, is one of the most widely used measures of risk-adjusted return. The formula is simple: (Rp - Rf) / sigma, where Rp is the portfolio return, Rf is the risk-free rate, and sigma is the portfolio's standard deviation.

For example, a portfolio returning 12% with a risk-free rate of 4.5% and standard deviation of 15% has a Sharpe ratio of 0.50. That means you earn 0.50 units of excess return for each unit of risk. Compare this to another portfolio returning 9% with a standard deviation of 5% -- its Sharpe ratio is 0.90, making it the better risk-adjusted choice despite the lower raw return.

## Interpreting the Sharpe Ratio

- **Below 0:** The portfolio underperforms the risk-free rate. You would be better off in Treasury bills.
- **0 to 0.5:** Poor risk-adjusted return. The risk is not well compensated.
- **0.5 to 1.0:** Adequate. Typical for many diversified portfolios.
- **1.0 to 2.0:** Good to very good. Indicates strong risk-adjusted performance.
- **Above 2.0:** Excellent. Rarely sustained over long periods.

The S&P 500 has historically produced a Sharpe ratio around 0.4-0.6 over long periods. Hedge funds and active managers who consistently achieve Sharpe ratios above 1.0 are considered top performers.

## Frequently Asked Questions

**Q: What risk-free rate should I use?**

A: Most analysts use the yield on 10-year U.S. Treasury bonds, which is currently around 4-5%. For shorter investment horizons, you might use the 3-month Treasury bill rate. The key is to match the risk-free rate's duration to your investment horizon and to use the same rate when comparing multiple investments.

**Q: Can the Sharpe ratio be negative?**

A: Yes. A negative Sharpe ratio means the portfolio's return is below the risk-free rate. You would have been better off putting the money in Treasury bills without taking any market risk. A negative Sharpe ratio is a clear signal that the investment strategy is not working.

**Q: What is the difference between Sharpe and Sortino ratios?**

A: The Sharpe ratio penalizes all volatility equally, whether upside or downside. The Sortino ratio only penalizes downside volatility by using downside deviation instead of standard deviation. This makes Sortino more appropriate for investments with asymmetric return distributions, like options strategies or venture capital.

**Q: Why can't I compare Sharpe ratios across different time periods?**

A: The Sharpe ratio is sensitive to the time period and frequency of measurement. A strategy measured monthly will have a different Sharpe ratio than the same strategy measured daily, because standard deviation scales with the square root of time. Always annualize both returns and standard deviation, and compare investments over the same time period.

---

Source: https://vastcalc.com/calculators/finance/sharpe-ratio
Category: Finance
Last updated: 2026-04-08