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Betting Odds Converter & Payout Calculator

Convert American odds to decimal odds and calculate the payout on a stake.

Result

Total Payout
$190.91
Profit
$90.91
Decimal Odds
1.909
Implied Probability
52.4%

This is a pure math conversion of the odds format, not betting advice.

About the Odds Converter

The Betting Odds Converter turns American-style odds (like -110 or +200) into decimal odds, a projected payout, and the implied win probability behind the price. It is a pure math conversion tool for reading odds that helps bettors compare offers presented in different formats or quickly see what a given stake would return. The calculator does not evaluate whether a bet is a good value, only what the numbers mean.

How It Works

Enter American odds (negative for favorites such as -150, positive for underdogs such as +200) and a stake amount. The calculator converts the odds to a decimal odds multiplier, applies it to the stake to get the total payout, subtracts the stake to isolate profit, and separately computes the implied break-even win probability that the odds represent. Favorites and underdogs use different conversion formulas because American odds are quoted differently on either side of even money.

For positive odds: Decimal Odds = (Odds / 100) + 1, Implied Probability = 100 / (Odds + 100). For negative odds: Decimal Odds = (100 / |Odds|) + 1, Implied Probability = |Odds| / (|Odds| + 100). Payout = Stake x Decimal Odds; Profit = Payout - Stake.

Formula & Methodology

With the calculator's default -110 odds and a $100 stake, decimal odds equal (100 / 110) + 1 = 1.909, so a $100 stake returns a payout of $190.91 and a profit of $90.91. Implied probability for -110 is 110 / (110 + 100) = 110/210, or about 52.4%, meaning a bettor would need to win more than that share of the time at that price to profit over the long run, before any bookmaker margin is considered.

Examples

Standard Point-Spread Bet

The calculator's defaults of -110 odds on a $100 stake return decimal odds of 1.909, a total payout of $190.91, a profit of $90.91, and an implied win probability of about 52.4%.

Underdog Moneyline Bet

Odds of +200 on a $50 stake convert to decimal odds of 3.000, a payout of $150.00 (profit of $100.00), with an implied win probability of exactly 33.3%.

Advantages

  • Converts between American and decimal odds instantly, useful when comparing sportsbooks that display formats differently.
  • Shows profit separately from total payout, avoiding a common point of confusion between the two figures.
  • Surfaces the implied win probability behind a price, making it easier to judge how heavily favored or unfavored a side is.

Common Mistakes

  • Reading the total payout as the profit: a -110 bet on $100 pays out $190.91 total, not $190.91 in winnings on top of the stake.
  • Forgetting that negative odds represent favorites and positive odds represent underdogs, and entering the sign backwards.
  • Assuming implied probability is the true probability of an outcome, when it actually includes the sportsbook's built-in margin and is only a break-even threshold.

Edge Cases to Watch For

  • American odds of exactly zero are rejected with an error, since zero has no valid meaning in the American odds format.
  • Implied probabilities are calculated per side and are not automatically normalized against the opposing side's odds, so adding both sides of a two-way market together will typically sum to slightly over 100% because of the bookmaker's built-in margin.
  • The tool performs a format conversion only; it does not account for parlays, odds boosts, or bet types beyond a single straight wager on a single stake.

Common Use Cases

  • Bettors comparing odds quoted in American format against decimal-odds books.
  • Anyone who wants to quickly see the dollar payout on a stake before placing a bet.
  • Sports fans studying how implied probability relates to posted betting lines.
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

What do negative and positive American odds mean?

Negative odds (like -150) show how much you'd need to stake to win $100 - a favorite. Positive odds (like +200) show how much you'd win on a $100 stake - an underdog. Both convert to the same decimal odds scale for comparison.

What is implied probability?

It's the break-even win probability the odds represent - odds of -150 imply a 60% chance, meaning the bettor needs to win more than 60% of the time at that price to profit long-run, before accounting for the bookmaker's built-in margin (which is why implied probabilities across all outcomes typically sum to slightly over 100%).

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Conclusion

This calculator handles the arithmetic behind odds formats and payouts so the numbers are easy to check before a bet is placed. It reports the math only, not a recommendation on whether any given price represents good value.