Odds Converter
Convert between decimal, fractional, American & probability
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How to Convert Between Odds Formats
Decimal → Fractional
Formula: Subtract 1, express as fraction. Example: 2.50 → 1.50 → 3/2
Decimal → American
≥ 2.00: (Decimal - 1) × 100 →
positive
< 2.00: -100 / (Decimal - 1)
→ negative Example: 2.50 → +150
Fractional → Decimal
Formula: Divide fraction + add 1. Example: 5/2 → 2.5 + 1 = 3.50
Any Format → Implied Probability
Formula: (1 / Decimal) × 100 Example: 2.00 → 50%
When to Use Each Odds Format
Decimal odds are the global standard. Most Indian betting sites use decimal format by default.
Fractional odds remain popular in the UK, especially for horse racing.
American odds dominate US sportsbooks. Essential for NBA, NFL, or US platforms.
Implied probability reveals the bookmaker's estimated chance. Compare with your assessment to find value bets.
Frequently Asked Questions
What are decimal odds?
Decimal odds show your total return including stake. Example: ₹100 at 2.50 odds returns ₹250.
How do fractional odds work?
Fractional odds show profit relative to stake. 5/2 means win 5 units for every 2 staked = 3.50 decimal.
What are American odds?
Positive (+150) = profit on ₹100 stake. Negative (-200) = stake needed to win ₹100.
What is implied probability?
Converts odds to percentage chance. Odds of 2.00 = 50% probability.
Which odds format is best?
Decimal odds are easiest for calculating returns. This converter helps you work across all formats.