Sharpe Ratio Calculator guide
The Sharpe ratio measures excess return per unit of total volatility. It helps compare investments only when inputs use consistent periods and methods.
The preserved calculator includes custom returns, Sortino and Treynor comparisons, sensitivity, projections, benchmarks, history, and exports.
How to use the Sharpe ratio calculator
- Enter current amounts: Use current, documented values from the same relevant period.
- Enter assumptions: Use realistic rates, percentages, periods, and costs where applicable.
- Review the full result: Review the primary estimate together with its supporting measures.
- Stress-test risk: Model less favorable timing, value, cost, or rate assumptions.
Formula and variables
The estimate applies the entered values and assumptions to the stated formula.
Sharpe ratio = (portfolio return − risk-free rate) / standard deviation- Inputs — Entered values
- The amounts, percentages, or periods supplied to the calculator.
- Result — Calculated output
- The estimate produced by applying the formula to the entered values.
Worked example: Sharpe ratio calculator
A user enters a representative set of values and assumptions.
- Key inputs
- Amounts, percentages, periods, and costs
- Apply the stated formula.
- Include all relevant entered values and constraints.
- Compare the result with an alternative scenario.
Result: Excess return, Sharpe ratio, qualitative interpretation, comparisons, sensitivity, and projections.
Use the estimate as a planning input and verify important decisions with current records or qualified guidance.
Understanding your results
Primary estimate
Excess return, Sharpe ratio, qualitative interpretation, comparisons, sensitivity, and projections.
Risk measures
Use supporting payment, leverage, cost, and cash figures together.
Assumptions
- Entered rates and costs remain constant.
- Payments and cash flows occur on schedule.
Limitations
- Taxes, legal terms, accounting treatment, and transaction-specific costs may differ.
- Future values, timing, and rates are uncertain.
Common mistakes
- Reviewing only the headline result.
- Ignoring relevant costs, timing, or supporting measures.
- Using optimistic timing or value assumptions.
- Treating an estimate as a guaranteed outcome.
Practical use cases
Compare scenarios consistently
Change one assumption at a time or enter each alternative using the same basis.
Plan cash requirements
Estimate funds needed before committing.
Planning and decision guide
Stress-test the assumptions
Annualize returns, risk-free rates, and volatility consistently.
Review the important risks
Historical ratios do not guarantee future performance.
Verify the source values
Review drawdowns, liquidity, concentration, and non-normal returns alongside Sharpe.
Frequently asked questions
What is the Sharpe ratio?
Excess return divided by total return volatility.
Is a higher Sharpe ratio better?
It indicates more historical excess return per unit of measured volatility, all else equal.
Can Sharpe ratios be negative?
Yes, when return is below the risk-free rate.
Sources and review
- Risk and return — Investor.gov. Accessed 2026-07-10.
Reviewed 2026-07-10.