Hedge calculator: work out the lay stake that locks in your result

Backing a selection and then laying it means you have taken both sides. Whatever happens, one bet wins and the other loses, and the difference between them is your result. Choose the lay stake correctly and that difference is the same regardless of the outcome.

The lay stake is your potential back return divided by the lay price, adjusted for commission. Backing £20 at 5.00 gives a £100 return, so laying at 3.00 needs a stake of about £33.30 to produce the same £100 exposure on the other side.

The result depends entirely on how the price moved. Backing at 5.00 and laying at 3.00 locks in a profit because the selection shortened after you backed it. Backing at 3.00 and laying at 5.00 locks in a loss, because it drifted. Hedging does not create value — it fixes whatever value the price movement has already produced.

The strongest case is a large position that has moved substantially in your favour — a long-priced ante-post bet or an accumulator with one leg to run. Taking a certain, smaller profit instead of an uncertain, larger one is a reasonable choice, and one worth making deliberately rather than in the last minutes before an event.

The weaker case is hedging out of discomfort. If the price has not moved much, hedging mainly pays commission for the privilege of ending a bet you had already decided was worth making. If your original judgement was sound, closing the position early at roughly the same price gives away the edge you identified.

Commission matters more than people expect. At 2% to 5% on winnings, every hedge takes a bite, and a strategy that hedges routinely will find the cumulative cost significant. The calculator includes commission on the exchange side for exactly this reason.

There is a middle option that gets overlooked, which is hedging only part of the position. Laying a fraction of your potential return takes some risk off the table while leaving upside if the selection wins, and it is often a better fit for how people actually feel about a bet than the binary choice between letting it ride and closing it entirely. Run the full hedge figure first, then decide what proportion of it you actually want.

The other thing worth knowing is when not to bother. If the price has barely moved, the hedge locks in a result close to zero while costing commission, and you have paid for the privilege of ending a bet you had already judged worth making. Hedging is a response to a large favourable move or a genuine change of view, not a way of managing nerves.