Odds Converter - American, Decimal & Fractional

Free odds converter for sports betting. Instantly convert between American, Decimal, and Fractional odds formats. See implied probability for any betting odds.

American Odds (e.g., -110, +150)

Decimal Odds (e.g., 1.91, 2.50)

Fractional Odds (e.g., 10/11, 3/2)

Implied Probability:—

This calculator is for informational and educational purposes only. Results should be verified with your sportsbook before placing any wagers. All betting carries risk. Full Disclaimer

How to Use This Calculator

1
Enter Your Odds: Input odds in any format - American (-110), Decimal (1.91), or Fractional (10/11)
2
View Conversions: All other formats update automatically as you type
3
Check Probability: See the implied probability percentage for your odds

Frequently Asked Questions

How do I convert American odds to decimal?

For positive American odds: Decimal = (American/100) + 1. For negative: Decimal = (100/|American|) + 1. Example: +150 = 2.50 decimal, -150 = 1.67 decimal.

What is the difference between American and decimal odds?

American odds show profit relative to $100 (e.g., -110 means bet $110 to win $100). Decimal odds show total return per $1 bet (e.g., 1.91 returns $1.91 total). Decimal odds are simpler for calculating payouts.

How do fractional odds work?

Fractional odds show profit relative to stake. 5/1 means you win $5 for every $1 bet. 1/5 means you win $1 for every $5 bet. Common in UK horse racing and traditional sportsbooks.

What does implied probability mean in betting?

Implied probability is the win percentage suggested by the odds. It represents the break-even point. At -110 odds (52.4% implied), you need to win more than 52.4% of bets to profit long-term.