Betting calculators
Five free calculators for checking the numbers behind arbitrage and value betting before you stake anything. No signup, no tracking of what you enter — everything runs in your browser.
Arbitrage calculator
Enter two or three decimal odds and a total stake to check the book percentage and split stakes across outcomes.
Hedge calculator
Work out the hedge stake that locks in the same result whichever side wins — and see honestly when it locks in a loss.
Expected value calculator
Convert odds and your estimated probability into an edge percentage and dollar EV per bet.
Implied probability calculator
Convert decimal odds to implied probability and back, and understand how the bookmaker margin hides inside odds.
Staking calculator
Fractional Kelly stake sizing from your bankroll, odds and estimated probability — with the variance warnings most sites skip.
What calculators can and cannot do
Calculators verify arithmetic. They do not verify that the odds you entered still exist, that both bookmakers will accept your stake, or that your probability estimate is any good. That gap is exactly where arbitrage and value betting software earns or fails to earn its subscription — see our software comparison hub and the guides before paying for anything.
If you are trialling a scanner, work through our software trial checklist so you test the things that actually matter.