Betting Odds Calculator
Whether you’re betting on football, horse racing, basketball, or any other sport, understanding your potential returns is crucial. This Betting Odds Calculator instantly converts between decimal, fractional, and American (moneyline) odds formats, calculates your potential payout and profit, and shows the implied probability of your bet winning.
Betting Odds Calculator & Converter
Enter your stake and odds in any format to calculate returns and convert between formats
| Stake Amount | Currency |
| Odds Format | Enter Odds |
Understanding Betting Odds Formats
Different regions and bookmakers use different odds formats. Understanding how to convert between them is essential for comparing value across different betting platforms.
1. Decimal Odds (European Format)
The most common format in Europe, Australia, and Canada. Decimal odds represent the total payout (stake + profit) for every 1 unit staked.
• Stake: K 100
• Total Payout: K 100 × 2.50 = K 250
• Profit: K 250 – K 100 = K 150
2. Fractional Odds (UK Format)
Traditional British format showing the profit relative to stake. Expressed as a fraction (e.g., 3/2, 5/1, 1/2).
• Stake: K 100
• Profit: K 100 × (3/2) = K 150
• Total Payout: K 100 + K 150 = K 250
3. American Odds (Moneyline)
Used primarily in the United States. Can be positive (+) or negative (-):
- Positive (+): Shows profit on a K 100 stake (e.g., +150 means K 150 profit on K 100)
- Negative (-): Shows stake needed to win K 100 (e.g., -200 means stake K 200 to win K 100)
Example -200: Stake K 200 → Profit K 100 → Total K 300
Odds Conversion Formulas
Decimal – 1 = Numerator/Denominator
Example: 2.50 – 1 = 1.50 = 3/2
Decimal to American:
If Decimal ≥ 2.00: (Decimal – 1) × 100
If Decimal < 2.00: -100 ÷ (Decimal - 1)
Example: 2.50 → (2.50 – 1) × 100 = +150
Implied Probability:
Probability (%) = (1 ÷ Decimal Odds) × 100
Example: 1 ÷ 2.50 × 100 = 40%
Common Odds Conversion Table
| Decimal | Fractional | American | Implied Probability | Profit on K 100 |
|---|---|---|---|---|
| 1.50 | 1/2 | -200 | 66.67% | K 50 |
| 1.80 | 4/5 | -125 | 55.56% | K 80 |
| 2.00 | 1/1 (Evens) | ±0 | 50.00% | K 100 |
| 2.50 | 3/2 | +150 | 40.00% | K 150 |
| 3.00 | 2/1 | +200 | 33.33% | K 200 |
| 5.00 | 4/1 | +400 | 20.00% | K 400 |
| 10.00 | 9/1 | +900 | 10.00% | K 900 |
How to Calculate Implied Probability
Implied probability is the conversion of betting odds into a percentage, showing what the bookmaker believes are the chances of an outcome occurring. This helps you identify if a bet offers value.
Formula for Decimal Odds:
Example: Odds of 2.50
(1 ÷ 2.50) × 100 = 40%
Formula for Fractional Odds:
Example: Odds of 3/2
[2 ÷ (3 + 2)] × 100 = 40%
Formula for American Odds:
For Negative Odds (-): [Odds ÷ (Odds + 100)] × 100 (use absolute value)
Example +150: [100 ÷ (150 + 100)] × 100 = 40%
Example -200: [200 ÷ (200 + 100)] × 100 = 66.67%
Multiple Bet Types Explained
Beyond single bets, here are common multiple bet types you can calculate:
| Bet Type | Description | Example |
|---|---|---|
| Single | One selection. Must win to get a return. | 1 bet on Team A to win |
| Double | Two selections. Both must win. | Team A AND Team B to win |
| Treble | Three selections. All must win. | Team A AND B AND C to win |
| Accumulator (4+) | Four or more selections. All must win. | 4+ teams to win |
| Trixie | 3 selections, 4 bets (3 doubles + 1 treble) | Requires 2+ wins for a return |
| Patent | 3 selections, 7 bets (3 singles + 3 doubles + 1 treble) | Requires 1+ wins for a return |
| Lucky 15 | 4 selections, 15 bets (4 singles + 6 doubles + 4 trebles + 1 fourfold) | Requires 1+ wins for a return |
Calculating Accumulator Returns
For multiple bets (accumulators/parlays), multiply all decimal odds together, then multiply by your stake:
Selection 1: 1.80
Selection 2: 2.00
Selection 3: 1.50
Selection 4: 2.50
Stake: K 100
Combined Odds: 1.80 × 2.00 × 1.50 × 2.50 = 13.50
Total Payout: K 100 × 13.50 = K 1,350
Profit: K 1,350 – K 100 = K 1,250
Frequently Asked Questions
Which odds format is best for beginners?
Decimal odds are the easiest for beginners because they show the total return directly. Simply multiply your stake by the decimal odds to get your total payout. For example, K 100 × 2.50 = K 250 total return.
How do I know if I’m getting good value?
Compare the bookmaker’s implied probability with your own assessment. If you believe a team has a 60% chance of winning, but the odds imply only 50% (odds of 2.00), this represents value. Consistently finding and betting on value is the only way to beat bookmakers long-term.
What does “odds-on” and “odds-against” mean?
Odds-on means the event is more likely to happen than not (decimal odds < 2.00, e.g., 1.50). Odds-against means the event is less likely to happen (decimal odds > 2.00, e.g., 3.00). “Evens” or “even money” is exactly 2.00 (50/50 chance).
Why do different bookmakers offer different odds?
Bookmakers set odds based on their risk management, market demand, and profit margins. Shopping around for the best odds (known as “line shopping”) can significantly increase your long-term profits. A difference between 1.90 and 2.00 might seem small, but over 100 bets, it makes a huge difference.
What is the “vig” or “juice” in betting?
The vig (vigorish) or juice is the bookmaker’s commission built into the odds. It’s why the implied probabilities of all outcomes in a market add up to more than 100%. Typical vig ranges from 5-10% depending on the sport and market. Lower vig means better value for bettors.
Can I make a living from betting?
While theoretically possible, making a consistent living from betting requires exceptional discipline, deep statistical knowledge, strict bankroll management, and the ability to find value consistently. Less than 3% of bettors are profitable long-term. Most should treat betting as entertainment, not income.
This Betting Odds Calculator is provided for educational and entertainment purposes. All calculations are estimates based on the odds provided. Actual payouts may vary depending on bookmaker rules, dead heats, voided bets, and other factors. Always check your bookmaker’s specific terms and conditions. Please gamble responsibly.