Odds Converter
Convert between American, Decimal, Fractional odds and implied probability.
e.g. +150, -110, +300
e.g. 2.50, 1.91, 4.00
e.g. 3/2, 10/11, 3/1
e.g. 40.00, 52.38, 25.00
Quick Reference
| American | Decimal | Fractional | Implied Prob. |
|---|---|---|---|
| -200 | 1.50 | 1/2 | 66.67% |
| -150 | 1.67 | 2/3 | 60.00% |
| -110 | 1.91 | 10/11 | 52.38% |
| EVEN | 2.00 | 1/1 | 50.00% |
| +110 | 2.10 | 11/10 | 47.62% |
| +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% |
How to Convert Betting Odds
Betting odds can be displayed in three main formats: American (moneyline), Decimal, and Fractional. Each format represents the same underlying probability differently. American odds use plus/minus notation relative to $100, Decimal odds show total return per $1 wagered, and Fractional odds show profit relative to stake. Understanding implied probability — the breakeven percentage a bet needs to win — is key to finding value in sports betting markets.
American to Decimal
For positive American odds: Decimal = (American / 100) + 1. For negative: Decimal = (100 / |American|) + 1. Example: +150 = (150/100) + 1 = 2.50. -200 = (100/200) + 1 = 1.50.
Decimal to Implied Probability
Implied Probability = (1 / Decimal Odds) × 100. Example: 2.50 decimal odds = (1/2.50) × 100 = 40% implied probability. This means the market prices this outcome at a 40% chance of occurring.
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