Betting odds can display the same price in several formats. American odds are common at US sportsbooks, decimal odds are widely used internationally, and fractional odds remain familiar in UK and Irish betting markets. This calculator converts between American, decimal, fractional odds and implied probability. It also calculates profit, total return and the stake required to reach a target profit.
Betting Odds Converter
Convert American, decimal, fractional odds and implied probability without losing the value being typed.
Payout and target-profit calculator
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What the Odds Converter Calculates
- American to decimal: convert moneyline prices such as +150 or −200.
- Decimal to American: convert total-return multipliers such as 2.50 or 1.67.
- Fractional conversion: convert prices such as 5/2, 10/11 or evens.
- Implied probability: calculate the break-even chance represented by one offered price.
- Profit and total return: separate winnings from the returned stake.
- Target profit: calculate how much must be staked to produce a chosen profit.
Common Odds Conversion Table
| American | Decimal | Fractional | Implied probability | Profit on $100 | Total return |
|---|---|---|---|---|---|
| −500 | 1.20 | 1/5 | 83.33% | $20.00 | $120.00 |
| −200 | 1.50 | 1/2 | 66.67% | $50.00 | $150.00 |
| −150 | 1.67 | 2/3 | 60.00% | $66.67 | $166.67 |
| −110 | 1.91 | 10/11 | 52.38% | $90.91 | $190.91 |
| +100 | 2.00 | 1/1 | 50.00% | $100.00 | $200.00 |
| +150 | 2.50 | 3/2 | 40.00% | $150.00 | $250.00 |
| +200 | 3.00 | 2/1 | 33.33% | $200.00 | $300.00 |
| +400 | 5.00 | 4/1 | 20.00% | $400.00 | $500.00 |
| +1000 | 11.00 | 10/1 | 9.09% | $1,000.00 | $1,100.00 |
American, Decimal and Fractional Odds Explained
American odds
Positive prices show the profit from a $100 stake. Negative prices show the stake required to win $100 profit.
+150: stake $100 → profit $150−200: stake $200 → profit $100
Decimal odds
Decimal odds are the total-return multiplier, including the returned stake.
$100 × 2.50 = $250 total returnProfit = $250 − $100 = $150
Fractional odds
A fraction shows profit relative to stake. At 5/2, each 2 units staked produce 5 units of profit.
$100 × 5 ÷ 2 = $250 profitTotal return = $350
Odds Conversion Formulas
Positive American to Decimal
Decimal odds = 1 + (American odds ÷ 100)
Example: +150 becomes 1 + 150 ÷ 100 = 2.50.
Negative American to Decimal
Decimal odds = 1 + (100 ÷ |American odds|)
Example: −200 becomes 1 + 100 ÷ 200 = 1.50.
Decimal to American
If decimal ≥ 2.00: American = (decimal − 1) × 100
If decimal < 2.00: American = −100 ÷ (decimal − 1)
Fractional to Decimal
Decimal odds = 1 + (numerator ÷ denominator)
Example: 5/2 becomes 1 + 5 ÷ 2 = 3.50.
Decimal to Implied Probability
Implied probability = 1 ÷ decimal odds × 100
Example: 2.50 becomes 1 ÷ 2.50 × 100 = 40%.
Profit, Total Return and Target Profit
Profit is the amount won above the original stake. Total return is the profit plus the returned stake.
Profit = stake × (decimal odds − 1)
Total return = stake × decimal odds
At 2.50 decimal with a $100 stake:
- profit = $100 × 1.50 = $150;
- total return = $100 × 2.50 = $250.
To calculate the stake required for a target profit:
Required stake = target profit ÷ (decimal odds − 1)
Implied Probability and Break-Even Chance
The implied probability of one offered price is its break-even win rate. If 2.50 decimal implies 40%, a bettor's true probability estimate must exceed 40% for positive expected value at that price.
This does not mean the bookmaker's no-vig estimate is exactly 40%. The offered market normally contains margin, but the break-even threshold of the individual bet remains determined by its price.
Why One Implied Probability Does Not Remove Vig
Bookmaker margin is measured across a complete market. In a two-way market, the raw implied probabilities of both sides usually sum to more than 100%. In a three-way soccer market, the home, draw and away probabilities may also exceed 100% when added together.
To estimate margin-free probabilities, enter all sides into the No-Vig Calculator. To measure the raw overround, use the Bookmaker Margin Calculator.
Which Odds Format Is Best?
No display format pays more by itself. The best available price is the one with the highest underlying decimal value after confirming that the markets, settlement rules and limits are equivalent.
For example, +150, 2.50 and 3/2 are the same price. A sportsbook offering 2.55 is better than one offering 2.50, regardless of whether the interface displays American, decimal or fractional notation.
Choose Another Odds Tool
The main converter handles all common formats. Use a dedicated tool when the task requires a full-market or one-direction calculation.
One-direction converters
Focused pages for a specific input and output format.
Probability and market margin
Convert probabilities or analyze every side of a market.
Charts and guides
Lookup tables, exports and worked payout explanations.
Frequently Asked Questions
What is an odds converter?
How do I convert American odds to decimal odds?
How do I convert decimal odds to American odds?
Why does the calculator show a nearest fractional price?
What does +200 mean in betting?
What does −150 mean in betting?
What are even-money odds?
Does implied probability remove bookmaker margin?
What is the difference between profit and total return?
Responsible gambling notice: Odds conversion does not establish that a bet has positive value. Your probability estimate can be wrong, and bookmaker rules, limits and settlement terms can differ. Never wager more than you can afford to lose. If gambling stops being entertainment, visit BeGambleAware in the UK or call 1-800-GAMBLER in the US.