Betting Odds Calculator & Converter

Convert American, decimal, fractional and implied odds, and see your exact payout on any bet.

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How Betting Odds Formats Work

Every sportsbook price says the same two things — how much a bet pays and how likely the book thinks it is to win — just in different notation. American odds (+150, -110) show profit relative to a $100 stake. Decimal odds (2.50, 1.91) show total payout per $1 staked. Fractional odds (3/2, 10/11) show profit as a fraction of the stake. Implied odds translate any of them into a win probability.

How to Use the Odds Calculator

  1. Type odds in any format — American, decimal, fractional or implied — and the other three convert instantly.
  2. Enter a bet amount to see exactly what the ticket would win and pay out.

Quick reference

  • -110 = 1.91 decimal = 10/11 = 52.4% implied — the standard price on point spreads.
  • +100 = 2.00 decimal = 1/1 = 50% implied — “even money.”
  • +150 = 2.50 decimal = 3/2 = 40% implied.
  • -200 = 1.50 decimal = 1/2 = 66.7% implied.

The payout you're calculating isn't fixed — the same bet often pays more at another sportsbook. Compare prices on OddsShopper's odds screen, check what the juice costs you with the hold calculator, or find bets priced in your favor with the EV calculator.

Odds Calculator FAQ

How do I convert American odds to decimal?

For positive American odds, divide by 100 and add 1 (+150 → 2.50). For negative odds, divide 100 by the absolute value and add 1 (-110 → 1.91). Decimal odds are your total payout per $1 staked, including the stake.

What is implied probability?

Implied probability is the win rate the odds are pricing in. Divide 1 by the decimal odds: -110 (1.91) implies 52.4%, +200 (3.00) implies 33.3%. If you think the true chance is higher than the implied probability, the bet has positive expected value.

What does +200 mean in betting?

Positive American odds show the profit on a $100 stake: +200 pays $200 profit ($300 total) on a $100 bet. Negative odds show how much you must stake to profit $100: -150 means betting $150 to win $100.

Why does the same bet pay differently at different sportsbooks?

Each sportsbook sets its own lines and moves them independently based on its liabilities. The same bet routinely pays meaningfully more at one book than another — which is why line shopping before you bet is the single easiest way to improve your results.