A hedge ratio is the size of a hedging position relative to the exposure it is meant to offset, a measure of how much of a risk you have covered.
Last reviewed 8 October 2025 · Educational, not advice
A hedge ratio measures how much of a risk you have offset with a protective position. When you hedge, you take a second position that is meant to move in the opposite direction to something you already hold, so that a loss on one side is cushioned by a gain on the other. The hedge ratio compares the size of that protective position with the size of the exposure it is meant to cover. It answers a simple question: relative to the risk I am worried about, how much protection have I actually put on? People express it as a percentage, such as fifty percent, or as a plain ratio, such as one to one.
The number tells a clear story. A hedge ratio of one, also written as one hundred percent, means the hedge is sized to match the exposure fully, so in principle a move against you on the original position is offset by an equal and opposite move on the hedge. A ratio below one means you have hedged only part of the exposure, leaving some risk uncovered on purpose. A ratio above one means the hedge is larger than the position it is meant to protect, which is no longer pure protection, because the extra size becomes a new bet in its own right. Choosing the ratio is therefore a deliberate decision about how much risk to keep and how much to neutralise.
In practice a perfect hedge is rare. The instrument you use to hedge seldom moves exactly in step with the thing you are protecting, so even a carefully chosen ratio leaves a gap, sometimes called basis risk, between how the two actually behave. Costs add another layer, since fees, the spread, and the price you can actually trade at all eat into the protection. Timing matters too, because a hedge that fits today may be the wrong size tomorrow as prices and exposures change. For these reasons more advanced approaches adjust the hedge ratio using the measured relationship between the two positions rather than assuming they move one for one. The headline point is that the ratio is a planning tool, not a promise that losses disappear.
With event contracts, the idea applies whenever someone uses a contract to offset a different risk they already carry. The person has to decide how large the offsetting position should be relative to that risk, and that sizing decision is the hedge ratio. Because an event contract settles on a defined yes or no outcome that may not line up cleanly with the exposure being hedged, the offset is often imperfect, and fees and limited liquidity can widen the mismatch further. None of this is a reason to assume a hedge makes a position safe. It is a reason to size any hedge thoughtfully, understand what it does and does not cover, and remember that hedging can itself lose money. We do not tell you to hedge or how much to trade. We explain the concept so you can read it correctly.
Say you face a one thousand dollar exposure to some risk and you put on a protective position sized at five hundred dollars against it. Your hedge ratio is roughly one half, or fifty percent, meaning about half the exposure is covered and half is left open. If you sized the hedge at one thousand dollars instead, the ratio would be one, a full hedge in principle. Whether the offset actually works as intended still depends on how closely the two positions move together, which is why a clean ratio on paper is not a clean result in practice.
Illustrative only. Simplified numbers, not a quote, a strategy, or a prediction, and excluding fees.
A hedge can fail to protect you, and an oversized hedge becomes a fresh bet. Hedging costs money and can still lose money. Stake only what you can afford to lose, never to chase a loss, and never on borrowed money. If it stops feeling like a free choice, step back. In the United States you can call or text the helpline on 1-800-GAMBLER or visit ncpgambling.org.
A hedge ratio is the size of a hedging position relative to the exposure it is meant to offset. It tells you how much protection you have put on compared with the risk you are trying to cover, often expressed as a percentage or a simple ratio.
A hedge ratio of one, or one hundred percent, means the hedge is sized to match the exposure fully. A ratio below one means only part of the exposure is hedged, and a ratio above one means the hedge is larger than the original position, which itself adds risk.
Rarely. A perfect hedge is unusual because the hedging instrument seldom moves exactly in step with the exposure, and costs and timing get in the way. A hedge ratio is a planning tool, not a guarantee that losses are eliminated.
Someone using event contracts to offset another risk has to decide how large the offsetting position should be relative to that risk. That sizing decision is the hedge ratio. Mismatched outcomes, fees, and liquidity mean the offset is usually imperfect, so treat any hedge with care.
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