Betting odds can be shown in several formats. US sportsbooks usually use American odds, European and Canadian books often use decimal odds, and UK or Irish racing markets still commonly use fractional odds.
This Odds Converter converts between American, decimal, fractional, and implied probability formats. It also calculates profit, total return, and the break-even probability for any stake.
Quick examples: -110 equals 1.91 decimal, 10/11 fractional, and about 52.38% implied probability. +150 equals 2.50 decimal, 3/2 fractional, and 40% implied probability.
Odds Converter
Convert American, decimal, fractional odds and implied probability.
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Choose the Right Odds Tool
Use the main converter above for quick odds format conversion. If you need a more specific calculation, choose one of the dedicated tools below.
Convert Odds Formats
Switch between American, decimal and fractional formats.
Probability and Fair Price
Turn odds into break-even chance, or convert your own probability estimate into a fair price.
Payout Charts and References
Use quick lookup tables, CSV exports and formula guides.
What This Odds Converter Does
- American to decimal odds: convert moneyline odds like +150 or -200.
- Decimal to American odds: convert prices like 2.50 or 1.67 into US format.
- Fractional to decimal odds: convert UK odds like 5/2, 10/11, or evens.
- Odds to implied probability: see the break-even chance behind any price.
- Stake and payout: calculate profit and total return from your bet size.
Common Odds Conversion Table
| American | Decimal | Fractional | Implied Probability | Profit on $100 |
|---|---|---|---|---|
| -500 | 1.20 | 1/5 | 83.33% | $20 |
| -200 | 1.50 | 1/2 | 66.67% | $50 |
| -150 | 1.67 | 2/3 | 60.00% | $66.67 |
| -110 | 1.91 | 10/11 | 52.38% | $90.91 |
| +100 | 2.00 | 1/1 | 50.00% | $100 |
| +150 | 2.50 | 3/2 | 40.00% | $150 |
| +200 | 3.00 | 2/1 | 33.33% | $200 |
| +400 | 5.00 | 4/1 | 20.00% | $400 |
| +1000 | 11.00 | 10/1 | 9.09% | $1,000 |
American Odds Explained
American odds, also called moneyline odds, are built around $100.
- Positive American odds, such as +150, show how much profit you win from a $100 bet.
- Negative American odds, such as -200, show how much you must risk to win $100 profit.
For example, +150 means a $100 bet profits $150. -200 means you must risk $200 to profit $100.
Decimal Odds Explained
Decimal odds show the total return multiplier, including your returned stake.
For example, odds of 2.50 mean a $100 bet returns $250 total: $150 profit plus the original $100 stake.
Fractional Odds Explained
Fractional odds show profit relative to stake. Odds of 5/2 mean you win 5 units of profit for every 2 units staked.
For example, a $100 bet at 5/2 profits $250 and returns $350 total.
Odds Conversion Formulas
American to Decimal
For positive American odds:
Decimal Odds = 1 + (American Odds ÷ 100)
Example: +150 becomes 1 + 150 ÷ 100 = 2.50.
For negative American odds:
Decimal Odds = 1 + (100 ÷ Absolute American Odds)
Example: -200 becomes 1 + 100 ÷ 200 = 1.50.
Decimal to American
For decimal odds of 2.00 or higher:
American Odds = (Decimal Odds – 1) × 100
For decimal odds below 2.00:
American Odds = -100 ÷ (Decimal Odds – 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 = 40%.
Implied Probability and Value Betting
Implied probability is the break-even probability created by the odds. If odds imply 40%, you need the outcome to win more than 40% of the time to have positive expected value before accounting for market margin and model error.
This does not mean the bookmaker believes the outcome has exactly that true probability. Sportsbook odds usually include vig, also called juice or bookmaker margin.
For removing margin from a full market, use the No-Vig Calculator or Bookmaker Margin Calculator.
Which Odds Format Is Best?
No format pays better by itself. American, decimal, and fractional odds are only different ways to show the same price. The better bet is the sportsbook offering the better underlying odds, not the sportsbook using your preferred format.
For example, +150, 2.50, and 3/2 all represent the same payout.
Frequently Asked Questions
What is an odds converter?
An odds converter changes betting odds from one format to another, such as American to decimal, decimal to fractional, or odds to implied probability.
How do I convert American odds to decimal odds?
For positive American odds, divide by 100 and add 1. For negative American odds, divide 100 by the absolute odds and add 1.
How do I convert decimal odds to American odds?
If decimal odds are 2.00 or higher, subtract 1 and multiply by 100. If decimal odds are below 2.00, divide -100 by decimal odds minus 1.
How do I convert fractional odds to decimal odds?
Divide the numerator by the denominator, then add 1. For example, 5/2 becomes 3.50 decimal odds.
What does +200 mean in betting?
+200 means a $100 bet profits $200. It equals 3.00 decimal odds, 2/1 fractional odds, and 33.33% implied probability.
What does -150 mean in betting?
-150 means you must risk $150 to profit $100. It equals about 1.67 decimal odds, 2/3 fractional odds, and 60% implied probability.
What are even money odds?
Even money means the profit equals the stake. It is 2.00 in decimal odds, +100 in American odds, and 1/1 or evens in fractional odds.
Does implied probability remove the bookmaker margin?
No. Implied probability from a single price does not remove vig. To remove margin, you need all sides of the market and a no-vig calculation.