Sortino Ratio

The Formula and Its Two Inputs

Sortino ratio = (R_p − MAR) ÷ DD

• R_p: the average periodic return of the deal or fund.
• MAR, the minimum acceptable return: the threshold below which a result counts as a shortfall. Many investors use the risk-free rate; others use zero, an inflation rate or the fund's preferred return.
• DD, downside deviation: for each period, take the shortfall below MAR (zero if the return met or beat MAR), square it, average across all periods, then take the square root.

Because periods above the threshold contribute zero to downside deviation, upside volatility no longer reduces the ratio. That is the entire difference from the Sharpe ratio.

A Worked Florida Example (Hypothetical)

This is a hypothetical illustration built to show the method. The funds and returns are invented, describe no real investment, and are not typical market figures.

An LP compares two Florida funds over five years, using a minimum acceptable return of 4.0%. Fund B repositions older Orlando apartment communities. Fund C builds small industrial projects around Tampa and books most of its gain in the year it sells a completed project.

Step 1: Sharpe ratio for reference. Fund B's sample standard deviation is 10.86% (squared deviations 64 + 196 + 144 + 64 + 4 = 472, ÷ 4 = 118, square root 10.86). Fund C's is 11.83% (49 + 25 + 36 + 441 + 9 = 560, ÷ 4 = 140, square root 11.83). Using 4.0% as the risk-free rate, Fund B scores 6.0 ÷ 10.86 = 0.55 and Fund C scores 6.0 ÷ 11.83 = 0.51. On Sharpe, they look nearly identical.

Step 2: downside deviation. Fund B fell short of 4% twice: year 2 (−4%, a shortfall of 8 points) and year 4 (2%, a shortfall of 2 points). Squared shortfalls: 64 + 4 = 68. Average over all five years: 68 ÷ 5 = 13.6. Square root: 3.69%. Fund C fell short once: year 1 (3%, a shortfall of 1 point). Squared: 1. Average over five years: 0.2. Square root: 0.45%. Fund C's 4% in year 3 meets the threshold, so it is not a shortfall.

Step 3: Sortino ratio. Fund B: 6.0 ÷ 3.69 = 1.63. Fund C: 6.0 ÷ 0.45 = 13.4 (6.0 ÷ 0.447 before rounding).

Fund C's volatility came almost entirely from one strong sale year. Fund B actually lost money in one year. Sharpe barely separates them; Sortino separates them sharply. The caution: Fund C's ratio rests on a single outcome, and five years is a short record. Run your own series in the risk-adjusted return calculator.

Judgment Calls That Change the Answer

• The threshold. Raising MAR from 4% to an 8% preferred return would turn more years into shortfalls and lower both ratios. Always state the MAR you used.
• Dividing by all periods or only shortfall periods. The common convention averages over all periods, as above. Dividing only by the number of shortfall periods produces a larger downside deviation and a smaller ratio. Use one method consistently.
• Short records. With only one or two shortfall periods, the ratio can swing enormously on a single data point. Treat very high values with suspicion.
• Appraisal smoothing. Private real estate values are appraisal-based and move slowly, which hides some downside. The ratio can only measure the losses that were reported.

Where Sortino Fits in CRE Underwriting

Sortino is most useful for strategies whose return pattern is lopsided: ground-up development, value-add repositioning and opportunistic funds that realize gains in lumps. For stabilized core assets with steady cash yields, Sharpe and Sortino usually tell a similar story. Pair either one with the deal's IRR and equity multiple, and stress the exit with the hold period sensitivity tool, since exit timing drives most of the downside in a short hold period.

Measure Downside Risk on Your Deal

Compare Sharpe and Sortino ratios side by side, then stress-test the exit.

What minimum acceptable return should I use?

Use the return below which a result would genuinely disappoint you. The risk-free rate is common for comparing funds. A fund's preferred return is a sensible threshold for an LP judging whether a sponsor is likely to clear the pref. State the choice, because it changes the result.

Why can the Sortino ratio be extremely high or undefined?

If an investment rarely or never fell below the threshold, downside deviation is tiny or zero, so the ratio becomes very large or cannot be calculated. That usually signals a short or smoothed track record, not a risk-free investment.

When does Sortino give a different answer from Sharpe?

When returns are skewed. If a fund's big swings are mostly gains, Sharpe treats them as risk and Sortino does not, so Sortino ranks it higher. If returns are roughly symmetrical, the two ratios usually rank investments the same way.

Can a sponsor use Sortino to make a deal look better?

Yes, by choosing a low threshold, a short window or projected rather than realized returns. Ask for the threshold, the period count, the calculation method and whether the returns were appraisal-based or realized.

Article Summary

The Sortino ratio is (average return − minimum acceptable return) ÷ downside deviation, so only shortfalls below the threshold count as risk. In a hypothetical five-year comparison at a 4.0% threshold, an Orlando value-add fund and a Tampa development fund both average 10.0% and have similar Sharpe ratios (0.55 and 0.51), but their Sortino ratios are 1.63 and 13.4 because the development fund's volatility is almost all upside. State the threshold and method, and distrust very high ratios built on short or smoothed records.

Key Takeaways

• ✓Sortino ratio = (return − minimum acceptable return) ÷ downside deviation.
• ✓Only periods below the threshold count as risk.
• ✓Downside deviation squares each shortfall and averages over all periods.
• ✓Skewed strategies can have similar Sharpe ratios and very different Sortino ratios.
• ✓The threshold you pick changes the answer; always disclose it.
• ✓Very high values usually mean a short or smoothed track record.

About Michael R. Linton

Michael R. Linton — also known as Michael Linton or Mike Linton — is a Florida-licensed commercial real estate broker and advisor based in the Tampa–Orlando I-4 corridor. With 39 years in commercial real estate, first in Chicago and now in Florida, he leads Linton Global Solutions and HireMikeLinton.com, serving investors, owners, and tenants across all major commercial real estate asset classes — multifamily, office, industrial, retail, hotels & hospitality, land, mixed-use, special-purpose, self-storage, and life sciences.

Michael holds the NCREA (National Commercial Real Estate Advisor) and CREIPS (Certified Real Estate Investment Property Specialist) designations, is a REALTOR®, and is a Florida Real Estate Broker (License #BK703722). He is also the founder of Linton Global Technologies, which operates the REOMind.ai AI-powered REO disposition platform serving a network of banks.

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Works Cited

1. CFA Institute. "Investment Performance Measurement and Risk-Adjusted Return Resources." CFA Institute, https://www.cfainstitute.org/. Accessed Nov 4, 2026.
2. U.S. Department of the Treasury. "Interest Rate Statistics." U.S. Treasury, https://home.treasury.gov/policy-issues/financing-the-government/interest-rate-statistics. Accessed Nov 4, 2026.
3. National Council of Real Estate Investment Fiduciaries. "NCREIF Property and Fund Indices." NCREIF, https://www.ncreif.org/. Accessed Nov 4, 2026.

Disclosure & Compliance

Disclosure: This article discusses proprietary technology developed by Linton Global Technologies. Michael R. Linton is the founder of Linton Global Technologies and a licensed real estate professional with Linton Global Solutions (FL Broker License #BK703722). This content is for informational purposes only and does not constitute investment, legal, or financial advice.

Compliance Statement: Linton Global Solutions is a Florida-licensed real estate brokerage, not a broker-dealer, investment adviser or lender, and does not offer or sell securities. CREDDS and REOMind.ai provide decision support only. Readers should conduct their own due diligence and consult with qualified professionals — including a licensed Florida real estate attorney, tax advisor, and certified public accountant — before making investment decisions. Past performance does not guarantee future results.