What it means
Hedging means buying protection against a price you cannot control, such as an exchange rate, a fuel price or an interest rate. The hedge ratio simply records how much of that exposure the protection genuinely covers.
Full cover is not automatically the right answer. Hedging costs money and removes favourable moves as well as damaging ones, so most treasury policies set a target band rather than a single figure, often covering a high proportion of the next twelve months and progressively less for later periods.
There is a second, more technical meaning used in derivatives markets. There the hedge ratio, frequently called delta, is the number of units of the hedging instrument needed to offset the effect of a one unit move in the item being hedged.
That version matters whenever the hedge and the exposure are not identical. Hedging jet fuel with crude oil futures, for instance, needs a ratio based on how closely the two prices have moved together in the past, a calculation known as the minimum variance hedge ratio.
The practical nuance is that hedge ratios drift. As exposures grow, contracts mature and price relationships change, a ratio set at 80% in January can quietly become 55% by June, which is why treasury teams recalculate it every month.
In practice
Real-world examples.
Example
A machinery importer with $24,000,000 of annual purchases in a foreign currency operates a treasury policy requiring a hedge ratio of at least 75% for the coming six months. Each month the treasurer buys additional forward contracts to keep the rolling ratio inside the band.
Example
A copper fabricator hedges 60% of expected metal purchases and deliberately leaves the rest open. The board accepts a partial hedge ratio because it believes prices are more likely to fall than rise and wants some benefit if they do.
Example
A property fund with floating rate debt of $50,000,000 swaps $35,000,000 into fixed rate, a hedge ratio of 70%. When the loan is partly repaid the exposure shrinks and the ratio rises above policy, so the fund closes out part of the swap.
Think of it
“Hedge ratio is how much of your risk you're covering-what portion is protected versus exposed.
Formula
Calculation
Hedge Ratio = Value or Volume of the Exposure Hedged / Total Value or Volume of the Exposure.
An airline expects to burn 20,000,000 gallons of jet fuel next year and has futures contracts covering 14,000,000 gallons.
Hedge ratio = 14,000,000 / 20,000,000 = 0.70, or 70%.
Where the hedging instrument is not a perfect match, the minimum variance hedge ratio is used instead: Optimal Hedge Ratio = Correlation between the two price changes multiplied by (Volatility of the exposure price / Volatility of the hedge price).
If crude oil futures and jet fuel prices show a correlation of 0.90, jet fuel volatility is 12% and crude volatility is 15%, then the optimal hedge ratio = 0.90 multiplied by (0.12 / 0.15) = 0.90 multiplied by 0.8 = 0.72. Applying that to the exposure gives 20,000,000 multiplied by 0.72, which is 14,400,000 gallons to hedge.Case study
Seen in the real world.
Meridian Coach Lines is an illustrative, invented bus operator used here to show how a hedge ratio is managed in practice. Its board set a policy of hedging 80% of expected diesel consumption twelve months ahead, since fuel was roughly a quarter of operating cost and contract fares could not be repriced mid-year.
In the fictional scenario, a large school contract was lost in March and expected consumption fell from 6,000,000 litres to 4,500,000 litres. The existing contracts covering 4,800,000 litres suddenly represented a hedge ratio of 107%, which meant Meridian was no longer hedging but speculating on the excess.
The treasurer sold contracts covering 1,200,000 litres to bring the ratio back to 80%, and the board added a rule requiring the hedge ratio to be recalculated whenever a contract worth more than 5% of revenue was won or lost.
Watch out
Common mistakes.
- Assuming a hedge ratio of 100% is the safest position, when over-hedging turns into speculation the moment the underlying exposure shrinks.
- Calculating the ratio once at the start of the year and never revisiting it as volumes, contracts and prices change.
- Confusing the proportion-of-exposure meaning with the delta meaning used in options, which leads to badly sized positions.
Questions
People also ask.
What is a sensible hedge ratio for a normal trading company?
Many policies sit between 50% and 90% for the near term and taper for later periods, but the right level depends on margin, contract terms and how quickly prices can be passed on.
Can the hedge ratio exceed 100%?
Arithmetically yes, and it happens when forecasts fall after contracts are bought, but at that point the excess is an open speculative position.
Does a higher hedge ratio reduce risk?
It reduces price uncertainty, though it increases the risk of being locked into an unattractive price and of paying out on contracts if volumes do not materialise.
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