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Odds Converter
For readers comparing how the same price is expressed. Implied probability is a price conversion, not an independent probability estimate.
Examples are hypothetical. CU = currency units. Use one consistent currency wherever CU appears. No live prices or provider data are fetched.
How to read the result
The four formats describe the same entered price, subject to display rounding. This converter does not remove bookmaker margin or show the true chance of an outcome.
Formula
- Convert to decimal d: decimal x; fractional a/b → 1+a/b; American A>0 → 1+A/100, A<0 → 1+100/|A|; probability p% → 100/p.
- Implied probability = 100/d. Fractional odds = d−1, approximated as a rational with denominator up to 10,000.
- American odds = 100(d−1) if d≥2; otherwise −100/(d−1). Display rounding does not change internal values.
Worked example
2.50 decimal → 1.50 = 3/2 fractional → +150 American → 100/2.50 = 40.00% implied probability.
Worked examples
Read the detailed guide: Odds conversion: two prices, four formats
Input specification and SEO alternatives
| Input | Type | Units | Default | Limits / choices |
|---|---|---|---|---|
| Input format | Choice | None | decimal | Decimal; Fractional; American; Implied probability (%) |
| Odds or probability | text | Decimal >1; fraction a/b with a,b >0; American ≤−100 or ≥100; probability >0 and <100% | 2.50 | 1–5000 characters; Decimal >1; fraction a/b with a,b >0; American ≤−100 or ≥100; probability >0 and <100% |
Meta description
Convert decimal, fractional and American odds or implied probability. See equivalent formats without treating odds as a forecast.
SEO title alternatives
- Odds Converter: Decimal, Fractional, American
- Betting Odds and Implied Probability Converter
- Convert Odds Between Four Formats
Outputs use English number formatting. Monetary amounts use two decimals; asset quantities use up to eight. Calculations retain unrounded intermediate values except the cent allocation stated for arbitrage.