Quick Conversion
Implied Win Probability
52.38%
Quick Reference
Fair coin flip (50%)
+100 / 2.00
Standard vig line
-110 / 1.91 (52.4%)
Heavy favorite (75%)
-300 / 1.33
Big underdog (25%)
+300 / 4.00
Compare Multiple Odds
Convert multiple odds at once to compare implied probabilities
Market Analysis
True Prob A (no-vig)
58.00%
True Prob B (no-vig)
42.00%
Find Your Edge
Your Edge
+5.00%
Book implies 40.00%, you estimate 45.00%
Implied Probability Reference
| American |
Decimal |
Fractional |
Implied Prob |
| -500 |
1.20 |
1/5 |
83.33% |
| -300 |
1.33 |
1/3 |
75.00% |
| -200 |
1.50 |
1/2 |
66.67% |
| -150 |
1.67 |
2/3 |
60.00% |
| -110 |
1.91 |
10/11 |
52.38% |
| +100 |
2.00 |
1/1 |
50.00% |
| +150 |
2.50 |
3/2 |
40.00% |
| +200 |
3.00 |
2/1 |
33.33% |
| +300 |
4.00 |
3/1 |
25.00% |
| +500 |
6.00 |
5/1 |
16.67% |
The Formula
Implied Probability = 1 / Decimal Odds × 100
For American odds: Negative odds → |Odds| / (|Odds| + 100)
Positive odds → 100 / (Odds + 100)