Free Bet Calculator

Convert sportsbook free bets (bonus bets) into guaranteed cash profit using the PromoGrind Free Bet Calculator.

Free Bet vs. Bonus Bet — What's the Difference?

The terms "free bet" and "bonus bet" are used interchangeably by most sportsbooks. Both refer to a promotional credit where the stake is not returned if the bet wins — only the profit is paid out. This is the key difference from a cash bet, where you receive stake + profit on a win.

How to Convert a Free Bet to Cash

The strategy is called free bet conversion or bonus bet hedging: place the free bet on an underdog at favorable odds (+250 to +400), then place a cash bet on the opposite outcome at another sportsbook. Regardless of which side wins, you pocket a guaranteed profit — typically 65–75% of the free bet's face value.

Why +250 to +400 Is the Sweet Spot

The underdog odds determine your conversion rate. Too short (+130) and you barely extract value. Too long (+800) and the required hedge stake is too small to maximize profit. The +250 to +400 range consistently yields 65–73% conversion — meaning a $200 free bet returns $130–146 in guaranteed cash.

Frequently Asked Questions

Is free bet conversion legal?

Yes. Converting a free bet using a hedge bet is legal wherever online sports betting is legal. You are simply placing two legal wagers using promotional credits from sportsbooks.

How much of my free bet can I convert?

Typically 65–75% of the face value, depending on the odds you choose. The PromoGrind calculator shows you the exact guaranteed profit for any combination of odds before you place either bet.

Do I need accounts at multiple sportsbooks?

Yes — you need the free bet at one book and a cash account at another to hedge the opposite side. Most grinders maintain accounts at 4–8 major books for this purpose.

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