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Free Bet & Bonus Bet Calculator

Turn a bonus bet into guaranteed cash. Enter your bonus and the back & lay odds — we'll show the exact amount to lay at the exchange and how much you keep, whatever the result.

Your bet

Lay this at the exchange

Lay stake—
Liability—
Profit if the bet wins—
Profit if the bet loses—
—
guaranteed profit · — of your bet kept

Free bet conversion — common questions

How does it work?

Place the bonus bet on a selection at a bookmaker, then lay the same selection at a betting exchange. The calculator finds the lay stake so your result is the same either way — converting a bonus bet, whose stake isn't returned, into guaranteed cash.

What is stake-not-returned (SNR)?

With a bonus/free bet the stake isn't returned — if it wins you keep only the profit. That changes the maths versus a normal cash (qualifying) bet, which the calculator handles automatically when you pick the bet type.

How much can I keep?

Usually 70–80% of the bonus as guaranteed cash, depending on the odds and commission; higher odds generally mean higher retention. Your exact retention shows above. Books can limit or restrict this activity, so read the promo terms.

For information only, not financial advice. Bookmakers may restrict promotional activity — always read the terms. Once you're comfortable turning bonuses to cash, the real long-term edge is positive expected value. 18+. Gamble responsibly.
Next, find real value: Value Finder · Line Shopping · Bet Tracker · Kelly Calculator · How it works