Odds Converter Calculator
Effortlessly switch between decimal, fractional, and American odds formats. Understand the implied probability of any bet instantly.
Decimal Odds
-
Fractional Odds
-
American Odds
-
Implied Probability
-
Understanding Betting Odds
Betting odds can seem confusing, but they are simply a way to represent the probability of an outcome and the potential return on a wager. This calculator helps you translate between the three most common formats, making it easier to compare odds from different bookmakers and understand the value of a bet.
The Three Formats Explained
- Decimal Odds: The simplest format. Your total return is your stake multiplied by the decimal odds. A £10 bet at 2.50 odds returns £25 (£15 profit + £10 stake).
- Fractional Odds: Traditional in the UK. The fraction shows the profit relative to your stake. Odds of 3/2 mean you win £3 profit for every £2 you bet.
- American (Moneyline) Odds: Centred around 100. Positive odds (+150) show the profit on a £100 stake. Negative odds (-200) show the stake needed to win £100 profit.
Implied Probability: The Hidden Percentage
Every set of odds has an 'implied probability' – the chance the bookmaker believes an outcome has of happening. For example, decimal odds of 2.00 (or 1/1 fractional) have a 50% implied probability. Understanding this helps you spot value. If you believe a team has a higher chance of winning than the odds suggest, that's a value bet. For more advanced bankroll management based on value, you might find our Kelly Criterion calculator useful.
Quick Reference Table
| Fractional | Decimal | American | Implied Probability |
|---|---|---|---|
| 1/10 | 1.10 | -1000 | 90.9% |
| 1/5 | 1.20 | -500 | 83.3% |
| 1/2 | 1.50 | -200 | 66.7% |
| 1/1 | 2.00 | +100 | 50.0% |
| 2/1 | 3.00 | +200 | 33.3% |
| 5/1 | 6.00 | +500 | 16.7% |
| 10/1 | 11.00 | +1000 | 9.1% |
Frequently Asked Questions
Related Calculators
Accumulator Bet Calculator
Calculate potential returns from accumulator (acca) bets with multiple selection...
Trixie Bet Calculator
Calculate returns for a Trixie bet with 3 selections, 4 bets (3 doubles + 1 treb...
Yankee Bet Calculator
Calculate returns for a Yankee bet with 4 selections and 11 bets.
Heinz Bet Calculator
Calculate returns for a Heinz bet with 6 selections and 57 bets.
Heinz Each-Way Bet Calculator
Calculate returns for an each-way Heinz bet with 6 selections and 114 bets.
Super Heinz Bet Calculator
Calculate returns for a Super Heinz bet with 7 selections and 120 bets.