Beta

How sensitive is your fund to market swings?

What is it?

Beta measures a fund's sensitivity to market movements. A Beta of 1.0 means the fund moves in lockstep with the market. A Beta above 1.0 means the fund amplifies market moves — it rises more in bull runs and falls more in crashes. A Beta below 1.0 means the fund is more stable than the market.

Beta represents systematic risk — the unavoidable risk that comes from the market itself. It does not measure a manager's skill or absolute performance, only how closely the fund tracks and amplifies market swings.

For a conservative investor, a low-Beta fund cushions against crashes. For an aggressive investor, a high-Beta fund can generate stronger returns in bull markets. Neither is inherently better — it depends entirely on your risk appetite and time horizon.

Formula

β = Cov(Rp, Rm) ÷ Var(Rm)

Cov(Rp, Rm)Covariance of fund returns with market returns

Var(Rm)Variance of market returns

In practice, Beta is estimated by regressing monthly fund returns against benchmark returns over 3–5 years.

Real Example

A mid-cap fund (Beta 1.25) vs a large-cap fund (Beta 0.85) during a market fall.

Given

Nifty 50 fall10%

Mid-cap fund Beta1.25

Large-cap fund Beta0.85

Calculation

Mid-cap expected fall: 10% × 1.25 = 12.5%
Large-cap expected fall: 10% × 0.85 = 8.5%

What this means

During a 10% market crash, the mid-cap fund could fall ~12.5% while the large-cap falls ~8.5%. Higher Beta means higher risk and higher potential upside.

Good vs Bad Benchmarks

✓Defensive (< 0.8)

Below 0.8

Cushions against market falls — lower risk, smoother ride

✓Market-like (0.9 – 1.1)

0.9 – 1.1

Moves roughly in line with the market

~Elevated (1.1 – 1.2)

1.1 – 1.2

Somewhat more volatile than the market — acceptable for equity funds

✗Aggressive (> 1.2)

Above 1.2

Significantly amplifies market moves — high risk, high reward

There is no universal 'ideal' Beta — it depends on your risk tolerance and investment goal.

Check this ratio for a real fund

MFLens shows Beta across 1Y / 3Y / 5Y / 7Y / 10Y rolling windows for every Indian mutual fund.

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Rolling metrics on MFLens show how each ratio evolves across all historical windows of the selected period. This provides consistency insights beyond traditional trailing calculations. For informational purposes only — not financial advice.