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Run the numbers

Free calculators that run in your browser. Nothing you type is sent anywhere. Results are math only, not advice, and every bet can lose.

Odds converter

Enter odds in any format to see all the others, plus the implied probability. How implied probability works.

American–
Decimal–
Fractional–
Implied probability–

Fractions are rounded to the nearest simple fraction (denominator up to 100). Implied probability includes the sportsbook's margin.

Parlay calculator

Add 2 to 12 legs in American odds. Every leg must win for the parlay to pay. How parlays work.

 
Parlay odds (decimal)–
Parlay odds (American)–
Total payout–
Implied chance all legs win–

Assumes independent legs and true-odds payouts. Some sportsbooks pay less on parlays, price same-game parlays differently, and handle pushes and ties by their own rules. Check the house rules.

Bankroll unit helper

A bankroll is money set aside for betting that you can afford to lose. A "unit" is a small, fixed slice of it. Bankroll basics.

1 unit–
2 units–
Bankroll in units–
Common max per bet1–2 units

Only bet money you can afford to lose. Never add more to chase losses. If betting stops being fun, call or text 1-800-MY-RESET.

Play responsibly.
Gambling problem? Call or text 1-800-MY-RESET (1-800-697-3738), the National Problem Gambling Helpline.
Responsible gaming help