Odds Converter

Question 1

What are the different odds formats and how do they work?

Answer

American odds use + and - symbols (e.g., +150, -200), decimal odds show total payout (e.g., 2.50), and fractional odds show profit ratio (e.g., 3/2). American odds are standard in the US, decimal odds are used worldwide, and fractional odds are popular in the UK. Each format represents the same probability but displays it differently.

Question 2

How do I convert American odds to decimal odds?

Answer

For positive American odds: Decimal = (American odds ÷ 100) + 1. For negative American odds: Decimal = (100 ÷ |American odds|) + 1. Example: +150 becomes (150 ÷ 100) + 1 = 2.50. -200 becomes (100 ÷ 200) + 1 = 1.50. Our calculator handles all conversions automatically.

Question 3

What is implied probability and why is it important?

Answer

Implied probability is the percentage chance of winning implied by the odds. It includes the bookmaker's margin (vig). For example, +100 odds = 50% implied probability, +200 odds = 33.33%. Comparing implied probability to your assessment of true probability helps identify value bets. Only bet when your probability is greater than implied probability.

Question 4

How do I calculate breakeven win percentage?

Answer

Breakeven percentage = 1 ÷ Decimal odds. For American odds: Positive = 100 ÷ (odds + 100), Negative = |odds| ÷ (|odds| + 100). Example: +150 odds = 100 ÷ 250 = 40% breakeven. You need to win 40% of the time to break even. Only bet when you expect to win more than the breakeven percentage.

Question 5

Which odds format should I use?

Answer

Use American odds if betting in the US, decimal odds for international betting or calculations, and fractional odds for UK/Irish markets. Decimal odds are easiest for calculations and understanding payouts. American odds are intuitive for US bettors. Choose based on your location and preference, but understand all formats.

Question 6

How do odds relate to probability and payouts?

Answer

Odds represent both probability and potential payout. Lower odds = higher probability = lower payout. Higher odds = lower probability = higher payout. For example, -200 odds mean 66.7% chance to win but only $50 profit on $100 bet. +300 odds mean 25% chance to win but $300 profit on $100 bet. Understanding this relationship is crucial for value betting.

Odds Converter

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Odds Conversion FAQ

Understanding Odds Formats