Odds Explained
How to read betting odds — decimal, fractional, and American
Betting odds tell you two things: how likely a sportsbook thinks an outcome is, and how much you’ll win if it happens. Three formats dominate, and converting between them is easy once you know the math.
Decimal odds (Europe, the global default)
Decimal odds tell you your total return per $1 staked, including your stake.
Example: Brazil to win at 2.10.
Stake $100 → return $210 ($100 stake + $110 profit).
To calculate implied probability: 1 / odds × 100. So 2.10 implies 1/2.10 = 47.6 %.
Fractional odds (UK)
Fractional odds show your profit per stake. Brazil 11/10 means: bet $10, win $11 profit ($21 total).
To convert to decimal: (numerator / denominator) + 1. So 11/10 = 1.10 + 1 = 2.10.
American odds (US)
American odds use a baseline of $100. Positive numbers show profit on a $100 stake; negative numbers show how much you must stake to win $100.
+550 means: stake $100 → win $550 profit.
-150 means: stake $150 → win $100 profit.
To convert +550 to decimal: (550/100) + 1 = 6.50.
To convert -150 to decimal: (100/150) + 1 = 1.67.
What is implied probability?
Every odds quote includes a built-in margin (the bookmaker’s vig). If a 50/50 coin flip were priced fairly, both sides would be 2.00 (50 % implied). Bookmakers price each side at, say, 1.91 — implying 52.4 % each, totaling 104.8 %. The 4.8 % is the book’s edge.
Finding value
A bet has “value” when your estimate of the true probability is higher than the implied probability. If you think Brazil is genuinely 50 % to win and the book offers 2.10 (implying 47.6 %), there’s value. Long-term, betting only on positive-expectation outcomes is the only way to win.
Quick conversion table
| Decimal | Fractional | American | Implied % |
|---|---|---|---|
| 1.50 | 1/2 | -200 | 66.7% |
| 1.91 | 10/11 | -110 | 52.4% |
| 2.00 | 1/1 (Evens) | +100 | 50.0% |
| 2.50 | 3/2 | +150 | 40.0% |
| 3.00 | 2/1 | +200 | 33.3% |
| 5.00 | 4/1 | +400 | 20.0% |
| 6.50 | 11/2 | +550 | 15.4% |
| 10.00 | 9/1 | +900 | 10.0% |
Who this guide is for
This guide is written for English-speaking bettors who are betting on the FIFA World Cup 2026 from a regulated jurisdiction (USA where legal, Canada, UK, Mexico, Australia, EU). It assumes no prior knowledge but moves quickly into intermediate territory. Beginners should also read How to Bet on the World Cup as a primer.
How long this takes
Approximately 8–12 minutes to read in full. We recommend skimming the headings first, deciding which sections apply to your bettor profile, then deep-reading those sections. The information is densest where it matters most — bonus math, market structure, line-shopping. Don't skip the tables.
What this guide doesn't cover
This is not financial advice or a guarantee of profit. Sports betting is a high-variance activity and even disciplined bettors lose 45–50% of placed bets. The strategies covered here are about reducing your loss-rate margin and improving expected value over time. They do not promise short-term profit.
We do not cover: betting on tennis or any other sport (separate guides exist for those); detailed legal advice (always check your local jurisdiction's rules); arbitrage betting (a niche professional pursuit); matched betting (which is no longer effective at most operators in 2026 due to limit changes).
Last updated & correction policy
This guide is reviewed by our editorial team every two weeks during the run-up to the World Cup, then weekly during the tournament itself. The "Last updated" date appears at the top of the page. If you spot a factual error or out-of-date claim, please email editor@fifaworldcupbetting.com and we will correct it within 24 hours.
Responsible gambling
Set a bankroll before you bet. Stake no more than 5% of your bankroll on a single match-result bet, 10% on a parlay or accumulator. If you find betting is no longer fun, pause. Help is free and confidential at BeGambleAware.org or 1-800-GAMBLER (USA).