Single Bet Calculator
Use our free single bet calculator with advanced metrics to calculate bet payout, profit, ROI, implied probability, and expected value (EV) instantly. Make informed betting decisions with detailed analytics.
Free Single Bet Calculator
Expected Value (EV) Calculator (Optional)
Table of Contents
How to Use the Single Bet Calculator
Our single bet calculator provides detailed analytics for your bets. Follow these steps:
Enter Bet Amount
Start by entering the amount you want to wager on your bet. This is the amount you're risking.
Enter Odds
Input the odds for your bet in any format - American (+150, -200), Decimal (2.50), or Fractional (3/2).
View Basic Metrics
The calculator automatically displays total payout, profit, ROI, and implied probability based on the odds.
Calculate Expected Value (Optional)
Enter your assessment of the true probability to calculate expected value (EV) and determine if the bet has positive value.
What is Expected Value (EV)?
Expected value (EV) is the average amount you can expect to win or lose per bet over the long term. It's a crucial metric for identifying value bets.
The formula for calculating expected value is:
EV = (Your Probability × Profit) - ((1 - Your Probability) × Bet Amount)
- Positive EV: The bet is profitable in the long run. You should place this bet.
- Negative EV: The bet is unprofitable in the long run. You should avoid this bet.
- Zero EV: The bet is fair - neither profitable nor unprofitable over the long term.
For example, if you believe a bet has a 60% chance of winning, the bet amount is $100, and the profit would be $150, the EV is (0.60 × $150) - (0.40 × $100) = $90 - $40 = $50. This is a positive EV bet. Use our single bet calculator to calculate EV for any bet.
What is Implied Probability?
Implied probability is the probability of an outcome occurring as suggested by the betting odds. It's calculated by converting odds to a probability percentage.
The formula for calculating implied probability depends on the odds format:
- Decimal Odds: Implied Probability = 1 / Decimal Odds × 100%
- American Odds (Positive): Implied Probability = 100 / (Odds + 100) × 100%
- American Odds (Negative): Implied Probability = |Odds| / (|Odds| + 100) × 100%
For example, decimal odds of 2.00 imply a 50% probability (1 / 2.00 × 100% = 50%). If you believe the true probability is higher than 50%, the bet may have positive expected value.
Comparing your assessment of the true probability to the implied probability helps you identify value bets. If your probability is higher than the implied probability, the bet likely has positive EV. Use our single bet calculator to see both implied probability and calculate EV based on your probability assessment.
Single Bet Calculator Examples
Example #1: Basic Bet Calculation
If you bet $100 at +150 American odds (2.50 decimal):
- Total payout: $100 × 2.50 = $250
- Profit: $250 - $100 = $150
- ROI: ($150 / $100) × 100% = 150%
- Implied probability: 1 / 2.50 × 100% = 40%
The calculator shows all these metrics automatically. Use our single bet calculator to see detailed analytics for any bet.
Example #2: Expected Value Calculation
If you bet $100 at +200 American odds (3.00 decimal) and you believe the true probability is 45%:
- Profit if win: $200
- Implied probability: 1 / 3.00 × 100% = 33.33%
- Your probability: 45%
- EV = (0.45 × $200) - (0.55 × $100) = $90 - $55 = $35
Since your probability (45%) is higher than the implied probability (33.33%), and EV is positive ($35), this is a value bet. Use our single bet calculator to identify value bets quickly.
Frequently Asked Questions About Single Bet Calculator
Expected value (EV) is the average amount you can expect to win or lose per bet over the long term. It's calculated as: EV = (Your Probability × Profit) - ((1 - Your Probability) × Bet Amount). A positive EV means the bet is profitable in the long run, while a negative EV means it's unprofitable. EV helps you identify value bets where the bookmaker's odds don't reflect the true probability.
Implied probability is the probability of an outcome occurring as suggested by the betting odds. It's calculated by converting odds to a probability percentage. For decimal odds, implied probability = 1 / decimal odds × 100%. For example, decimal odds of 2.00 imply a 50% probability. If you believe the true probability is higher than the implied probability, the bet may have positive expected value.
To calculate expected value, you need your assessment of the true probability and the potential profit. The formula is: EV = (Your Probability × Profit) - ((1 - Your Probability) × Bet Amount). For example, if you believe a bet has a 60% chance of winning, the bet amount is $100, and the profit would be $150, the EV is (0.60 × $150) - (0.40 × $100) = $90 - $40 = $50. Our single bet calculator does this automatically when you enter your probability assessment.
A positive EV bet is a bet where the expected value is greater than zero, meaning it's profitable in the long run. This happens when your assessment of the true probability is higher than the implied probability suggested by the odds. Positive EV bets are value bets that should be placed, as they offer long-term profitability.
Compare the implied probability (from the odds) to your assessment of the true probability. If your probability is higher than the implied probability, the bet likely has positive expected value. For example, if the odds imply a 30% probability but you believe it's actually 40%, the bet has positive EV. Use our single bet calculator to see both implied probability and calculate EV based on your assessment.
