Glossary term
Hedge Ratio
A hedge ratio shows how much of a hedging instrument is used relative to the exposure being hedged.
Updated
Read time
What Is a Hedge Ratio?
A hedge ratio shows how much of a hedging instrument is used relative to the exposure being hedged. It helps answer a practical question: how large should the hedge be compared with the position or risk the investor wants to offset?
Hedge ratios are used with futures, options, currency hedges, interest rate hedges, commodity hedges, and portfolio risk management. A hedge ratio of 1.0 usually means the hedge is intended to offset the exposure one-for-one. A lower ratio means only part of the exposure is hedged.
Key Takeaways
- A hedge ratio compares the size of a hedge with the exposure being hedged.
- A 100% hedge is not always the right target.
- The ratio can be based on market value, contract size, beta, duration, currency exposure, or statistical sensitivity.
- Hedge ratios can drift as prices, correlations, volatility, or portfolio holdings change.
- A hedge ratio reduces a defined exposure; it does not remove every risk.
Basic Hedge Ratio Formula
The value of the hedging position is the size of the instrument used to offset risk. The value of the exposure being hedged is the asset, liability, cash flow, or portfolio risk the investor wants to reduce.
Simple Example
If an investor has $1,000,000 of currency exposure and uses a $500,000 forward contract to hedge it, the hedge ratio is 0.50, or 50%. The investor has hedged half of the exposure and remains exposed to the other half.
In a futures hedge, the calculation may also depend on contract size. In an equity hedge, the ratio may use beta. In a bond hedge, it may use duration. The simple formula is a starting point, not the only method.
Common Hedge Ratio Inputs
Hedge setting | Input that may matter |
|---|---|
Equity portfolio | Portfolio beta and index futures value |
Bond portfolio | Duration, yield sensitivity, and futures conversion factors |
Currency exposure | Foreign-currency value and hedge contract amount |
Commodity exposure | Expected production or purchase quantity and futures contract size |
Options hedge | Delta and other option sensitivities |
What the Ratio Can Miss
The ratio also depends on the objective. Some investors hedge to reduce volatility, some to protect a specific cash flow, and some to neutralize a measured sensitivity such as beta, duration, or delta. Those goals can produce different hedge ratios for the same starting position.
A hedge ratio assumes the hedging instrument moves closely enough with the exposure to be useful. That relationship can weaken. Correlations can change, basis can widen, and the hedged position can change size.
Over-hedging can create a new exposure. Under-hedging can leave more risk than intended. This is why hedge ratios often need monitoring instead of being set once and ignored.
The Bottom Line
A hedge ratio measures the size of a hedge relative to the exposure being hedged. It is useful for sizing risk reduction, but the right ratio depends on the instrument, the exposure, and how stable the relationship is over time.