Enter your original bet, its odds and the current odds on the other side. The calculator sizes a second bet so you finish with the same amount whichever side wins.
Example: you hold $100 at +300, which returns $400. The other side is now -150. A $240 hedge also returns $400, so you have staked $340 in total and keep $60 either way.
A hedge gives up part of your possible win in exchange for a guaranteed result. It is most useful on the last leg of a parlay or a futures bet that has moved in your favor.