Use the hedge calculator to find how much to bet on the other side of a bet you've already placed.
Plus signs are optional in odds fields.
Hedging means betting against a bet you already have. The calculator sizes the hedge so both outcomes pay the same, which locks in your result: a guaranteed profit if the odds have moved in your favor, or a smaller guaranteed loss if they haven't.
For example, say you bet $100 at +150 and the other side is now -120. Hedging $136 locks in about $13 of profit no matter who wins.
Usually not. A hedge trades expected value for lower variance, so if your original bet was a good one, hedging costs you money over time. Read when to hedge a bet and why hedging lowers EV for the details. If you're betting both sides before either bet is placed, use the arbitrage calculator.