Betting Odds Explained — Decimal, American & Fractional (2026 Guide)

What Are Betting Odds?

Betting odds are the foundation of sports wagering. They serve two essential purposes: they tell you the implied probability of a particular outcome and they determine your potential payout if your bet wins. Understanding how to read odds is the single most important skill for any sports bettor, and yet it's something many beginners struggle with.

In this guide, we'll break down all three major odds formats — decimal, American, and fractional — with real-world examples using Canadian sports. By the end, you'll be able to read any odds format, convert between them, and calculate exactly how much you stand to win.

Decimal Odds: The Canadian Standard

Decimal odds are the default format at most Canadian sportsbooks and are the most straightforward to understand. They're also the standard in Europe, Australia, and most international markets.

How to Read Decimal Odds

Decimal odds represent the total return per $1 wagered, including your original stake. The formula is simple:

Total Payout = Stake × Decimal Odds

For example, if the Toronto Maple Leafs are listed at 1.75 to beat the Ottawa Senators:

A $10 bet returns: $10 × 1.75 = $17.50 total
Your profit: $17.50 − $10.00 = $7.50

And if the Ottawa Senators are listed at 2.25:

A $10 bet returns: $10 × 2.25 = $22.50 total
Your profit: $22.50 − $10.00 = $12.50

Key Rules for Decimal Odds

Odds of 2.00 represent an even-money bet — you double your stake if you win.
Odds below 2.00 indicate the favourite — you profit less than your stake.
Odds above 2.00 indicate the underdog — you profit more than your stake.
The lower the decimal odds, the more likely the sportsbook considers that outcome.

Decimal Odds Examples: NHL Game Night

Let's say you're looking at an NHL slate with the following moneyline odds:

Edmonton Oilers: 1.55 vs. Calgary Flames: 2.60
Vancouver Canucks: 1.90 vs. Winnipeg Jets: 1.95
Montreal Canadiens: 3.40 vs. Toronto Maple Leafs: 1.33

From these odds, you can immediately tell that the Oilers are solid favourites against the Flames, the Canucks-Jets game is essentially a coin flip, and the Leafs are heavy favourites over the Canadiens.

American Odds: Plus and Minus

American odds (also called moneyline odds) are the standard in the United States and are commonly displayed on North American sportsbooks. They use positive (+) and negative (−) numbers, which can be confusing at first but become intuitive with practice.

Negative American Odds (Favourites)

A negative number tells you how much you need to bet to win $100.

Example: Toronto Raptors at −150

You must bet $150 to win $100 in profit.
If you bet $10: Profit = $10 × (100 / 150) = $6.67
Total return: $16.67

Positive American Odds (Underdogs)

A positive number tells you how much you win on a $100 bet.

Example: Charlotte Hornets at +130

A $100 bet wins $130 in profit.
If you bet $10: Profit = $10 × (130 / 100) = $13.00
Total return: $23.00

American Odds at a Glance

−100 = even money (same as decimal 2.00)
The larger the negative number (e.g., −300), the heavier the favourite
The larger the positive number (e.g., +500), the bigger the underdog

Fractional Odds: The Traditional Format

Fractional odds are traditional in the United Kingdom and Ireland. You'll see them at some Canadian sportsbooks, especially for horse racing and soccer. They're expressed as a fraction like 5/2 or 3/1.

How to Read Fractional Odds

The fraction tells you your profit relative to your stake:

Profit = Stake × (Numerator / Denominator)

Example: A horse listed at 5/2:

For every $2 you bet, you win $5 in profit.
A $10 bet wins: $10 × (5 / 2) = $25 profit
Total return: $10 + $25 = $35

Example: A team listed at 1/4 (a heavy favourite):

For every $4 you bet, you win $1 in profit.
A $20 bet wins: $20 × (1 / 4) = $5 profit
Total return: $20 + $5 = $25

Common Fractional Odds

Evens (1/1) — you double your money, same as decimal 2.00 or American +100
2/1 — triple your money (decimal 3.00, American +200)
1/2 — profit half your stake (decimal 1.50, American −200)

Implied Probability: The Hidden Insight

Every set of odds can be converted into an implied probability — the percentage chance the sportsbook assigns to that outcome. This is one of the most powerful concepts in sports betting because it lets you compare the sportsbook's assessment against your own.

Implied Probability Formulas

From Decimal Odds:

Implied Probability = (1 / Decimal Odds) × 100

Example: Odds of 1.80 → (1 / 1.80) × 100 = 55.6%

From Positive American Odds:

Implied Probability = 100 / (American Odds + 100) × 100

Example: +200 → 100 / (200 + 100) × 100 = 33.3%

From Negative American Odds:

Implied Probability = |American Odds| / (|American Odds| + 100) × 100

Example: −150 → 150 / (150 + 100) × 100 = 60.0%

The Overround (Vig / Juice)

If you add up the implied probabilities for all outcomes in a market, they'll total more than 100%. This excess is called the overround, vig, or juice — it's the sportsbook's built-in margin.

For example, in a two-outcome market:

Team A: 1.87 → implied probability = 53.5%
Team B: 2.00 → implied probability = 50.0%
Total: 103.5%
Overround: 3.5%

The lower the overround, the better the value for bettors. Shopping for odds across multiple sportsbooks helps you find lines with lower juice.

Converting Between Odds Formats

Here are the conversion formulas you'll need:

Decimal to American

If decimal ≥ 2.00: American = (Decimal − 1) × 100 → positive
If decimal < 2.00: American = −100 / (Decimal − 1) → negative

American to Decimal

If positive: Decimal = (American / 100) + 1
If negative: Decimal = (100 / |American|) + 1

Decimal to Fractional

Subtract 1 from the decimal odds and express as a fraction. For example: 2.50 → 1.50 → 3/2.

Don't want to do the math by hand? Use our odds converter tool to instantly convert between all three formats.

Which Odds Format Is Best for Beginners?

We recommend decimal odds for Canadian beginners for several reasons:

Simplest payout calculation: Just multiply your stake by the odds. No positive/negative confusion.
Easy comparison: Higher number = higher payout. That's it.
Canadian default: Most Canadian sportsbooks display decimal by default, so it's what you'll see first.
No ambiguity: Unlike American odds, there's no split between + and − to remember.

That said, if you follow American sports media or use US-based content, you'll encounter American odds frequently. Learning both formats makes you a more versatile bettor.

Practical Examples: Reading a Betting Board

Here's how a typical CFL game might look across all three formats:

Winnipeg Blue Bombers: Decimal 1.65 | American −154 | Fractional 13/20
BC Lions: Decimal 2.30 | American +130 | Fractional 13/10

All three rows say the same thing: the Blue Bombers are favoured. A $100 bet on the Blue Bombers wins $65 profit, while a $100 bet on the Lions wins $130 profit.

Next Steps

Now that you understand how odds work, you're ready to make informed bets. Here are your next moves:

Use our odds converter to practise converting between formats.
Learn about the different types of bets available.
Browse our betting glossary for any terms you don't recognize.

Understanding odds is the foundation of smart betting. Every concept you learn from here — value betting, bankroll management, line shopping — builds on what you've learned in this guide.