The Critical MF Ratios Every Investor Must Understand

I have a confession.

For the first two years of my investing life, I picked mutual funds almost entirely on one number: the 1-year return. If it was at the top of the list, it went into my portfolio.

I suspect most Indian investors start this way. And to be fair, it works until it doesn't. Until you realise that the fund which gave 45% last year did so by taking on concentration risk that would have given you a heart attack in 2020. Or that the consistent performer you ignored had better risk-adjusted returns across every meaningful time horizon. To see how these ratios apply in practice, our top mutual funds guide shows exactly how Sharpe, Sortino and PTR differ across fund categories.

The difference between a fund that looks good and a fund that is good is buried in the ratios. This article is your guide to reading them.

Why Returns Alone Are Misleading

A fund that gives 22% in a year where the market gave 18% looks impressive. But what if it achieved that by concentrating 40% in one sector, running a portfolio turnover of 300%, and swinging wildly between cash and equity?

Returns tell you what happened. Ratios tell you how and at what cost. Once you understand the difference, you cannot go back to reading only the returns column.

The Ratios That Actually Matter

1. Sharpe Ratio — Return per unit of total risk

What it measures: How much return the fund generated for every unit of volatility (standard deviation) it took on.

Formula: (Fund Return − Risk-free Rate) ÷ Standard Deviation

Real example: Two funds both return 18%. Fund A has a Sharpe of 1.1. Fund B has a Sharpe of 0.6. Fund A delivered the same return with far less volatility — it is the better fund for most investors, especially those who cannot stomach a 30% drawdown without panic-selling.

Limitation: Sharpe treats upside and downside volatility equally, which is mathematically neat but not how humans experience markets. This is why Sortino exists.

2. Sortino Ratio — The ratio I use most

What it measures: Return per unit of downside risk only. It ignores upside volatility (which no investor minds) and focuses purely on the bad kind of volatility — the drawdowns.

Formula: (Fund Return − Risk-free Rate) ÷ Downside Deviation

3. Alpha — Are you being rewarded for active management?

What it measures: The excess return generated by the fund manager over and above what the benchmark would have delivered.

4. Beta — How much does the fund move with the market?

What it measures: The fund's sensitivity to market movements. A beta of 1.0 means it moves in line with the benchmark. Above 1.0 amplifies market moves. Below 1.0 means less volatile than the market.

5. Standard Deviation — The raw volatility measure

What it measures: How much the fund's returns fluctuate around its average. Compare within a category only — a small cap fund will always have higher standard deviation than a liquid fund, which is expected and appropriate.

6. PTR (Portfolio Turnover Ratio) — What churning really costs you

What it measures: How frequently the fund manager replaces the holdings. A PTR of 100% means the entire portfolio was replaced over the year.

7. Max Drawdown — The number that tells you about pain

What it measures: The maximum peak-to-trough decline in the fund's NAV over a given period.

8. CAGR — Used right, misleading used wrong

The right way to use it: Always look at rolling CAGR across multiple starting points, not just point-to-point. A fund that delivered 22% CAGR from March 2020 to March 2025 benefited enormously from buying at the COVID bottom. Rolling 5-year CAGR across multiple starting points is a far more honest picture.

How to Use These Ratios Together

No single ratio tells the complete story. Here is how to read them as a system:

Start with category — large cap, mid cap, flexi cap, hybrid each have different baseline expectations for all ratios. Then shortlist on Sortino and Max Drawdown to find funds that have delivered returns without brutal drawdowns. Check PTR to eliminate funds with consistently high turnover unless there is a clear strategy justification. Validate with Alpha to confirm the manager is actually adding value versus the benchmark after costs. Finally consider Beta for your temperament — if you are the type to panic-sell, lower-beta funds keep you invested through the cycle.

How SampadaSarathi Uses These Ratios to Generate Alpha

Ratios are not used in isolation at SampadaSarathi. Fund selection looks for convergence across three dimensions: fundamental momentum in the businesses the fund owns, evidence of a structural or cyclical shift favouring that segment, and a margin of safety in valuation that limits downside if the thesis takes time to play out.

The ratios described above are the tools used to confirm or challenge that thesis. Sortino and max drawdown tell us whether a manager has navigated difficult periods with discipline. PTR reveals whether conviction is real or reactive. Rolling alpha confirms whether outperformance is systematic or cyclical luck.

Your Next Step

Understanding ratios is step one. But remember — getting your equity-debt mix right matters more than which specific funds you pick within each category. Applying ratios to your actual portfolio — checking whether your current funds score well on these measures — is where it gets interesting.

Book a free 30-minute consultation and we will run your existing holdings through this framework together. You may be surprised by what you find.