Implied Probability Calculator 2026
Convert betting odds to probability and calculate bookmaker margins instantly
Enter Your Odds
Probability Result
The bookmaker estimates a 50.0% chance of this outcome winning
2.00
2.00
The Mathematics
Understanding probability calculations
Odds to Probability
2.00 → (1 ÷ 2.00) × 100 = 50%
Probability to Odds
50% → 100 ÷ 50 = 2.00
Margin Calculation
Sum all probabilities, subtract 100%
Fair Odds Formula
Divide implied prob by total prob, then calculate odds
Understanding Implied Probability
What is Implied Probability?
Implied probability converts betting odds into a percentage chance. It shows what the bookmaker believes is the likelihood of an outcome.
What is Bookmaker Margin?
The margin (vig/juice) is the bookmaker's built-in profit. If probabilities add up to more than 100%, the excess is their edge.
What are Fair Odds?
Fair odds are what the odds would be without any bookmaker margin. They represent the true implied probability.
How to Use This
Compare implied probability to your own estimate. If you think an outcome is more likely than the odds suggest, you may have found value.
Odds to Probability Reference
Common decimal odds and their implied probabilities
| Decimal Odds | Implied Probability | Type |
|---|---|---|
| 1.25 | 80.0% | favorite |
| 1.50 | 66.7% | favorite |
| 2.00 | 50.0% | even |
| 2.50 | 40.0% | underdog |
| 3.00 | 33.3% | underdog |
| 5.00 | 20.0% | longshot |
| 10.00 | 10.0% | longshot |
Pro Tips
Compare Multiple Bookmakers
Different bookmakers offer different odds. The same event can have 52% implied probability at one bookie and 48% at another.
Look for Low Margin Markets
Asian bookmakers and betting exchanges typically offer 2-3% margins compared to 5-6% at traditional bookies.
Track Your Edge
Keep records of your probability estimates vs implied probability. Consistent accuracy means profitable long-term betting.
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Frequently Asked Questions
About Our Implied Probability Calculator
Our professional implied probability calculator instantly converts betting odds into percentage probabilities. Understanding implied probability is essential for finding value bets - it tells you what chance the bookmaker assigns to each outcome.
The Pro mode includes a comprehensive margin calculator. Enter odds for all outcomes in a market to see the total implied probability, bookmaker edge, and fair odds without margin. Compare multiple bookmakers to find the best value.
This calculator is 100% free, works instantly as you type, and requires no registration. Updated for 2026 with real-time calculations used by professional bettors worldwide.
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Evgeny Volkov
Verified ExpertOver 10 years developing software for the gaming industry. Advanced degree in Mathematics. Specializing in probability analysis, RNG algorithms, and mathematical gambling models.