Bookmakers almost always offer cashout values below true mathematical fair value -- that's how they profit from the feature. This calculator shows you the fair value based on current market odds and how much your bookie is keeping. Enter your original bet, the current odds and your bookie's offer to see the gap instantly.
- →Fair cashout = (original stake x original odds) / current odds -- the mathematically correct value if the market is fair.
- →Most bookie cashout offers are 10-25% below fair value -- the gap is rarely visible to punters without a calculator.
- →A negative gap means the bookie is keeping part of your bet's true worth. A positive gap (rare) means the offer is above fair value.
- →Your calculation history is saved locally -- see the total amount bookies have kept across all your cashout checks.
Is your cashout offer fair value?
Enter your original bet and your bookie's cashout offer. We'll show you the true fair value and how much the bookie is keeping - instantly, no signup required.
Single Bet Calculator
When you cash out a bet, your bookie is effectively buying back your position. Like any business transaction, they need to make a margin on that trade.
The mathematically fair cashout is calculated as:
Example: $50 @ 4.00, current odds 2.50
Fair cashout = ($50 × 4.00) ÷ 2.50 = $80.00
Your bookie calculates their cashout offer using their internal odds - which include their margin (overround). This is typically 5-15% worse than the best available market price. The result is a cashout offer that is systematically below fair value.
This isn't illegal or even unusual - it's how bookmakers profit from the cashout feature. But most punters have no way to check the gap. That's what this calculator is for.
For each-way bets, the same logic applies to both the win and place portions separately. The place portion uses place odds derived from the win odds and the place fraction (e.g., 1/4 of win odds minus 1).
If you want to trade out a bet at true fair value, Betfair Exchange is the closest alternative - you lay your selection at the current exchange price, locking in profit or limiting loss without the bookie margin built in.
Which bookies offer fairer cashouts?
Based on our scoring data, these bookmakers consistently offer the tightest cashout margins and most flexible cash-out conditions.
🔍 Find your best bookie overall →
