When hedging makes sense
Hedging is most common with futures bets that have moved heavily in your favor. You bet a 10-1 longshot at the start of the season, the team makes the final, and now they're a small favorite. Hedging the opposite side locks in profit no matter the outcome, at the cost of giving up the larger expected value of letting the original bet ride.
The math
Original bet pays out (stake) × (decimal odds) if it wins. To lock in the same profit on the other outcome, the hedge stake must equal:
hedge stake = (original payout) / (hedge decimal odds)
If both legs are priced and your hedge is sized this way, the profit you lock in is identical regardless of which side wins. The calculator does this math automatically.
When not to hedge
If your original bet has positive expected value at the new prices (i.e., the line still under-prices the outcome), hedging gives up EV. Many sharp bettors do not hedge unless the original bet has gained extreme value. Recreational bettors hedge more often for psychological certainty, which is a legitimate but mathematically expensive choice.
For more on the underlying probability math, see our Implied Probability Calculator and Futures and Outright Odds Explained.