Value Betting & Expected Value (EV) Explained for Canadians | Odds Scout

What Is Expected Value?

Expected value (EV) is the average amount you can expect to win or lose per bet if you placed the same wager thousands of times. It is the single most important concept in profitable sports betting — more important than win rate, more important than which sport you bet on, and more important than any system or tipster.

Every bet you place has an expected value. If it is positive (+EV), the bet is profitable in the long run. If it is negative (-EV), you are expected to lose money over time. The goal of value betting is simple: consistently find and place +EV bets.

Here is the fundamental truth: you can win 60% of your bets and still lose money if you are taking bad odds. Conversely, you can win only 40% of your bets and still be profitable if the odds more than compensate for the lower hit rate. Expected value captures this relationship between probability and payout.

The Expected Value Formula

The EV formula is straightforward:

EV = (Probability of Winning × Amount Won per Bet) − (Probability of Losing × Amount Lost per Bet)

Let us walk through an example:

Scenario: You bet $100 on the Montreal Canadiens at +200 (decimal 3.00). You believe Montreal has a 40% chance of winning.

Probability of winning: 0.40
Amount won if you win: $200 (your profit at +200 odds)
Probability of losing: 0.60
Amount lost if you lose: $100 (your stake)

EV = (0.40 × $200) − (0.60 × $100) = $80 − $60 = +$20

This bet has an expected value of +$20 per $100 wagered. Over time, if your 40% probability estimate is accurate, you will profit an average of $20 every time you make this bet. That is a 20% ROI.

A Negative EV Example

Now consider betting $100 on the Leafs at -150 (decimal 1.667) when you believe they have a 58% chance of winning:

Probability of winning: 0.58
Amount won if you win: $66.67
Probability of losing: 0.42
Amount lost if you lose: $100

EV = (0.58 × $66.67) − (0.42 × $100) = $38.67 − $42.00 = −$3.33

This bet is -EV. Even though the Leafs are likely to win, the odds do not offer enough payout to compensate. You would lose $3.33 on average per $100 bet over time.

Calculate EV quickly for any bet with our Expected Value Calculator.

Implied Probability vs True Probability

Every set of odds carries an implied probability — the win percentage the odds suggest. Understanding implied probability is essential for finding value.

To convert American odds to implied probability:

Negative odds (favourites): Implied Probability = Odds / (Odds + 100). Example: -150 → 150 / (150 + 100) = 60%
Positive odds (underdogs): Implied Probability = 100 / (Odds + 100). Example: +200 → 100 / (200 + 100) = 33.3%

Use our Odds Converter to quickly switch between American, decimal, and fractional odds with implied probability.

True probability is your best estimate of the actual chance an outcome occurs. This is where skill and research come in — your true probability estimate incorporates everything you know about the matchup that the market might not have fully priced in.

Value exists when your estimated true probability is higher than the implied probability.

If a sportsbook has the Oilers at +150 (implied probability 40%), but you believe the Oilers have a 48% chance of winning, that is a +EV bet. The market is undervaluing Edmonton, and you are getting paid at odds that are better than they should be.

Finding +EV Spots

Here are practical ways Canadian bettors can identify positive expected value opportunities:

1. Line Shopping

The simplest +EV strategy is line shopping — comparing odds across multiple sportsbooks and always taking the best available number. If the market consensus on a moneyline is -140 but one book has -125, that -125 line is inherently more +EV.

2. Closing Line Value

If you place a bet early and the line moves in the direction of your bet before game time, you captured +EV. For example, if you bet the Raptors at +5.5 and the line closes at +4.5, you got a full point of extra value.

3. Promotional Offers

Odds boosts, profit boosts, and insurance promotions from sportsbooks can turn -EV or break-even bets into +EV plays. A 20% profit boost on a bet that is already close to fair value is genuinely +EV.

4. Steam Chasing

When sharp bettors hit a line hard and it moves rapidly at some books but not others, you can sometimes grab the pre-move number at a slower book. This is a time-sensitive strategy but can be highly effective.

5. Market-Specific Inefficiencies

Lower-volume markets like CFL betting, player props, and game props tend to have softer lines because sportsbooks invest less in pricing them accurately. If you have expertise in a niche area, you are more likely to find mispriced lines.

6. Public Bias Fading

The betting public tends to overvalue favourites, overs, and popular teams. When public money pushes a line beyond fair value, there can be +EV on the other side. This is not a universal rule, but it is a real tendency worth understanding.

Closing Line Value as a Performance Measure

Closing line value (CLV) is the gold standard for measuring betting skill. Professional sportsbooks use it to identify sharp bettors, and you should use it to evaluate your own performance.

The concept is simple: if you consistently beat the closing line — if the odds you got are better than the final odds before the game starts — you are almost certainly a winning bettor in the long run.

Here is why CLV is more reliable than short-term results:

Variance masks skill in the short term. You can be a losing bettor who gets lucky for 3 months, or a winning bettor who runs badly for the same period. CLV cuts through the noise.
The closing line is the most efficient price. By the time a game starts, the market has absorbed all available information. Beating this line consistently means you are finding value before the market does.
It is a leading indicator. Profits are a lagging indicator — they tell you how you did. CLV is a leading indicator — it tells you how you are likely to do going forward.

To track your CLV, record the odds you got on each bet and the closing odds. If you are getting better numbers than the close more often than not, your process is working even if short-term results are mixed.

A Practical Approach for Recreational Bettors

You do not need to be a math wizard or build complex models to apply EV thinking. Here is a practical approach:

Always line shop. This is the easiest +EV action you can take. It requires no skill beyond comparing numbers.
Use odds boosts wisely. Evaluate boosted odds against your probability estimate. Many boosts, especially on underdogs, offer genuine +EV.
Specialize. You are more likely to have an edge in one or two sports than in all of them. Deep knowledge of the NHL or CFL is more valuable than surface-level knowledge of everything.
Avoid heavy favourites at bad prices. Laying -200 or worse is rarely +EV unless you have a very strong reason to believe the favourite wins more than 67% of the time.
Think in probabilities, not picks. Before betting, ask "What is the probability this hits?" not "Do I think this will win?" The shift in framing makes you a more disciplined bettor.
Keep records and review them. You cannot calculate your historical EV or CLV without data. Track everything and review monthly.

Common +EV Situations to Watch For

Grand Salami mispricing: NHL and MLB Grand Salami totals (total goals/runs across all games) can lag behind individual game total moves.
Live betting overreactions: After a quick goal or run, live odds can overcorrect. If a team goes down 1-0 in hockey, the live moneyline often drops more than it should.
Backup goalie announcements: When an NHL backup goalie is confirmed late, some sportsbooks are slow to adjust the moneyline and total.
Correlated parlays via SGP: Sometimes SGP builders misprice correlated outcomes, giving you better-than-fair odds on logically connected legs.
Early week NFL lines: NFL lines posted on Sunday night for the following week are often less sharp than lines later in the week.
Promoted odds boosts: Always check — many boosted odds are genuinely +EV, especially for underdogs and props.

The Long-Term Mindset

Value betting requires patience. You will not see guaranteed profits in a week or even a month. The law of large numbers means that +EV bets only reliably produce profits over hundreds of wagers.

Think of it like a casino. The house edge on roulette is 2.7%. The casino does not win every spin — but they always win over time because every spin is +EV for them. When you place +EV bets, you are the casino.

Trust the process, keep your bet sizes disciplined, and let the math work in your favour over time. That is value betting in a nutshell.