Before you place bets, check the number

Betting Calculators

Free tools for odds conversion, EV, Kelly sizing, parlays, hedging, and vig removal.

Quick odds check — enter any American line:

American Odds

Stake ($)

Profit$90.91

Total Payout$190.91

Implied Probability52.38%

All calculators

Translate between American, decimal, fractional, and implied probability in one step.

Find the optimal fraction of your bankroll to bet given your edge and the odds.

Add up to 10 legs and see combined American odds, payout, and compounded vig cost.

Calculate the exact counter-bet needed to guarantee profit regardless of outcome.

Strip the sportsbook margin to find the true no-juice probability and fair odds for both sides.