About this tool
The Free Bet / Bonus Bet Value Calculator estimates what a stake-not-returned free bet is really worth in cash. Because the stake is not returned, a winning free bet of face value F at decimal odds d1 pays only the winnings F × (d1 − 1). At fair pricing the raw expected value is that amount divided by the odds, F × (d1 − 1) / d1 — which is why free bets are worth more when placed on longer odds.
All calculations run locally in your browser and nothing you enter is stored or sent. Enter the free-bet amount, the odds you will use it on, and the odds available on the opposite outcome to lock in a guaranteed return. Hedging the other side with stake H = F × (d1 − 1) / d2 leaves a certain profit of F × (d1 − 1) × (d2 − 1) / d2 whichever way the event goes. Dividing that locked profit by the face value gives the conversion rate — the percentage of the free bet you keep as real cash, typically around 60–75% at sensible odds.
This is a pure math reference; it does not handle real money or place bets. The conversion rate rises as the free-bet odds lengthen and as the hedge price stays close to fair, and it falls if the opposing side is heavily vigged. Use it to pick which market extracts the most value from a bonus and to compare offers.