American (Moneyline) Odds

What American odds are and how to read them

American odds (also called moneyline odds) use positive and negative numbers, both anchored to a £100/€100/$100 unit. The sign tells you immediately which side of even money you are on:

• Positive numbers (e.g. +250): The profit you make on a $100 stake. +250 means: stake $100, profit $250, total return $350. You are on the underdog side of even money.
• Negative numbers (e.g. −150): The stake required to profit $100. −150 means: stake $150 to profit $100, total return $250. You are on the favourite side of even money.

The dividing line is −100/+100, which both equal decimal 2.00 — the exact coin-flip price. Any positive number is longer than evens; any negative number shorter than evens.

Converting to decimal: the two formulas

Always convert to decimal for clear comparison:

• Positive moneyline to decimal: (Moneyline ÷ 100) + 1
  Example: +250 → (250 ÷ 100) + 1 = 3.50
• Negative moneyline to decimal: (100 ÷ |Moneyline|) + 1
  Example: −150 → (100 ÷ 150) + 1 = 1.667

Quick reference table for common moneyline prices:

• +100 = 2.00 (evens, 50.0%)
• +150 = 2.50 (40.0%)
• +200 = 3.00 (33.3%)
• +300 = 4.00 (25.0%)
• −110 = 1.909 (52.4%) — the standard spread price
• −150 = 1.667 (60.0%)
• −200 = 1.500 (66.7%)

The vig in American odds: how it differs from the decimal presentation

In American sports betting, two-outcome markets (spread, total) are almost universally priced at −110 on both sides. At decimal this is 1.909, implying 52.4% probability for each side.

The sum: 52.4% + 52.4% = 104.8%. The overround is 4.8% — exactly the same margin structure as a European book pricing both sides of a two-way market at 1.91. The format is different; the economic structure is identical.

Understanding this equivalence means you can evaluate American markets using the same overround logic you apply to decimal markets. The −110/−110 standard means bettors need to win approximately 52.4% of spread/totals bets just to break even — before shopping for better prices.

Point spreads and totals: where moneyline format dominates

The US sports betting market is structured primarily around two market types that use moneyline odds:

• Moneyline (winner): Straight win/loss. In a mismatched game, the favourite might be −400 (1.25 decimal) and the underdog +320 (4.20 decimal).
• Point spread: A handicap market designed to create a near-50/50 proposition. Both sides typically price around −110. If the spread is Patriots −6.5, they must win by 7 or more for a Patriots spread bet to win.
• Total (over/under): The combined score must finish over or under a set number. Also typically priced around −110 on both sides.

When you will encounter American odds outside the US

American odds appear in several contexts beyond US sportsbooks:

• International operators who serve US customers (DraftKings, FanDuel display them by default)
• Some European exchanges and comparison sites allow users to toggle between formats
• Pinnacle offers American format as an option alongside decimal
• Betting journalism and podcasts based in North America quote prices in this format

Even if you never use a US sportsbook, the ability to read moneyline odds quickly is essential for following international betting literature and understanding how the world's largest legal sports betting market operates.

Key Takeaway

American odds are the same pricing information in a different wrapper. Convert to decimal first, apply the implied probability formula as usual, and evaluate value on exactly the same basis. The format changes; the underlying maths does not.