Odds Converter Calculator
Convert between decimal, fractional, and American odds formats instantly. Calculate implied probability and potential returns from your stake.
e.g., 2.50, 1.80, 3.00
Enter your stake to calculate potential returns
Decimal (2.50): Multiply stake by this number to get total return
Fractional (3/2): For every £2 staked, you win £3 profit
American (+150): Positive = profit on £100 stake | Negative = stake needed to win £100
Implied Probability: The bookmaker's estimate of the outcome's likelihood
How to Use the Odds Converter
Using the Mr Super Tips Odds Converter is simple:
- Select your odds format - Choose between Decimal, Fractional, or American tabs
- Enter the odds - Type in the odds you want to convert
- View instant conversions - See all three formats plus implied probability
- Add your stake (optional) - Enter your bet amount to calculate potential returns
- Share your calculation - Click the Share button to save or share your results
Understanding Odds Formats
Decimal Odds (European Format)
Decimal odds represent the total return (stake + profit) you'll receive for every £1 wagered. They're the most straightforward format to understand.
Example: Odds of 2.50 mean you'll receive £2.50 back for every £1 staked (£1.50 profit + £1 stake).
Common in: Europe, Australia, Canada
Fractional Odds (UK Format)
Fractional odds show the potential profit relative to your stake. The format is "profit/stake".
Example: Odds of 3/2 mean you'll win £3 profit for every £2 staked (plus your £2 stake back).
Common in: United Kingdom, Ireland
American Odds (Moneyline Format)
American odds use positive and negative numbers. Positive odds show profit on a £100 stake, while negative odds show the stake needed to win £100 profit.
Example: +150 means you win £150 profit on a £100 stake. -200 means you need to stake £200 to win £100 profit.
Common in: United States
Frequently Asked Questions
How do you convert decimal odds to fractional?
To convert decimal odds to fractional, subtract 1 from the decimal odds, then express as a fraction. For example, 2.50 - 1 = 1.50 = 3/2. Our calculator does this automatically and simplifies the fraction for you.
What are American odds and how do they work?
American odds use positive (+) numbers for underdogs and negative (-) for favorites. Positive odds show profit on a £100 stake. Negative odds show how much to stake to win £100. For example, +150 means you win £150 profit on a £100 stake, while -200 means you need to stake £200 to win £100 profit.
How do you calculate implied probability from odds?
Implied probability is calculated by dividing 1 by the decimal odds and multiplying by 100. For example, decimal odds of 2.50 = (1/2.50) × 100 = 40% implied probability. This represents the bookmaker's estimation of that outcome occurring.
What is implied probability and why does it matter?
Implied probability is the bookmaker's assessment of how likely an outcome is to occur, expressed as a percentage. It's derived from the betting odds they offer. Understanding implied probability is crucial because it helps you identify value bets - situations where you believe the true probability of an outcome is higher than what the bookmaker's odds suggest. For instance, if a team has decimal odds of 2.00 (50% implied probability), but you believe they have a 60% chance of winning, that represents a value betting opportunity.
Which odds format is best?
There's no "best" format - it's personal preference and regional custom. Decimal odds are easiest for calculating returns. Fractional odds show profit clearly. American odds are standard in the US. Use whichever format you're most comfortable with, and convert as needed.
What does +150 mean in betting odds?
+150 in American odds means you would win £150 in profit for every £100 staked. This is equivalent to decimal odds of 2.50 or fractional odds of 3/2. The "+" indicates an underdog, with a 40% implied probability of winning.