Free Bet Calculator

Convert sportsbook free bets (bonus bets) into modeled cash value 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: model a bonus leg and an opposing cash leg before either order. The calculator compares listed settlement paths, but realized value can change with prices, limits, rejected stakes, voids, grading differences, eligibility, and execution timing.

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 modeled cash value.

Frequently Asked Questions

Is free bet conversion permitted where I live?

PromoGrind cannot determine that. Laws, age and location rules, operator eligibility, and promotion terms vary by jurisdiction and can change. Verify official regulator guidance and both operators' current terms; this calculator is not legal advice.

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 modeled return 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.

Core calculators are available now with a free PromoGrind account. Live scanning, AI help, and other backend-dependent surfaces remain in beta until their services are activated.