Lay betting (on betting exchanges like Betfair) lets you bet AGAINST an outcome. The calculator below computes liability and profit.
Liability if outcome wins
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Profit if outcome loses
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FAQ
Is this calculator free?
Yes. All our calculators run client-side in your browser. No sign-up, no data sent anywhere, no ads.
Are the calculations accurate?
Yes. We've validated every formula against industry-standard math. The math is the same that pro bettors use.