Betting Calculators

Every tool below runs instantly in your browser — no account, no data sent anywhere. The same math OddsWasp uses to keep its own predictions honest.

Odds Converter

Convert between decimal, fractional, American odds and implied probability.

Project the combined odds, payout and real probability of your acca.

Check whether a set of odds guarantees a profit — and how to split your stake.

Check whether a bet has positive expected value at your estimated probability.

See the bookmaker's built-in margin and what the fair odds would be without it.

Lock in a profit (or cap a loss) by betting the other side at current odds.