ValueBet is a method for finding betting opportunities where the odds offered by a sportsbook are higher than the fair value of that outcome.

The goal is not simply to predict who will win. The goal is to identify situations where the sportsbook is offering a price that is too high compared to the real probability of the event.

A normal bettor thinks:

“Which outcome will happen?”

A ValueBet user thinks:

“Are these odds better than they should be?”

That is the main idea. With ValueBet, you do not cover every possible outcome like in SureBet and Matched Betting. You place one bet because the odds are considered profitable in the long term.

This means that a ValueBet can lose. That is normal. What matters is not the result of one single bet, but the result of many ValueBets placed over time.

Sportsbooks do not always price events perfectly.

Setting odds for a sports event is complex. Sportsbooks need to consider many factors, such as team strength, player form, injuries, market activity, news, timing, and betting volume.

Because of this complexity, sometimes a sportsbook may offer odds that are more generous than the real probability of an outcome.

This can happen because:

• the sportsbook updates its odds more slowly than other sources;
• the sportsbook has a different opinion on the event;
• prices have moved, but the sportsbook price has not changed yet;
• the sportsbook has made a pricing error;
• the event or market is less efficient.

In simple terms, ValueBet opportunities exist because betting odds are not always perfectly aligned with the true probability of an event.

NinjaBet helps you identify these situations faster by analyzing betting prices and highlighting opportunities where the odds appear to be better than they should be.

Every bet has two important elements:

• the probability that the outcome will happen;
• the odds offered by the sportsbook.

A ValueBet exists when the odds offered by the sportsbook are more generous than the odds that should correspond to the real probability of that outcome.

For example, imagine an outcome has a real probability of 50%.

A 50% probability corresponds to fair odds of:

+100 (even money)

If a sportsbook offers -110, the price is not good. The sportsbook has the edge.

If a sportsbook offers +110, the price is valuable. The bettor has the edge.

The outcome may still lose, but the bet is profitable in expectation because the price is more generous than it should be.

Every odds price represents an implied probability — the probability the price is built around.

For American odds, the conversion depends on whether the odds are positive or negative:

Positive odds (e.g. +100): Implied Probability = 100 / (Odds + 100)
Negative odds (e.g. -200): Implied Probability = Odds / (Odds + 100), using the number without the minus sign

For example, odds of +100 represent an implied probability of 50%:

100 / (100 + 100) = 50%

Odds of -200 represent an implied probability of 66.67%:

200 / (200 + 100) = 66.67%

Odds of +200 represent an implied probability of 33.33%:

200 / (200 + 100) = 33.33%

The fair odds are the odds that correctly represent the real probability of an outcome, without the sportsbook margin (the vig).

If the sportsbook odds imply a higher probability than the real one, the sportsbook has an advantage.

If the sportsbook odds imply a lower probability than the real one, the bettor has an advantage.

That advantage is the value.

ValueBet is based on expected value.

Expected value tells you whether a bet should be profitable or unprofitable over a large number of similar bets.

American odds do not multiply directly with a probability, so to calculate expected value we first convert the odds to their decimal equivalent, then apply the formula:

Expected Value = (Decimal Odds × Estimated Probability) - 1

For example, if the real probability of an outcome is 50% and the sportsbook offers +110:

Step 1 — convert the odds (intermediate step): +110 becomes 2.10 in decimal.
Step 2 — apply the formula:
Expected Value = (2.10 × 50%) - 1
Expected Value = 1.05 - 1
Expected Value = 0.05
Expected Value = 5%

This means the bet has an expected value of 5%.

It does not mean that the bet will win. It means that if you could repeat this type of bet many times under similar conditions, the expected profit would be around 5% of the total amount staked.

Imagine a coin toss. There are two possible outcomes:

• Heads
• Tails

If the coin is fair, each outcome has a 50% probability.

The fair odds for Heads are:

+100 (even money)

Now imagine a sportsbook offers +110 on Heads. If you place a $10 bet at +110:

• if Heads wins, you receive $21 total, including your $10 stake;
• if Heads loses, you lose your $10 stake.

Since Heads has a 50% chance of winning, the expected value is (converting +110 to its decimal equivalent of 2.10 for the math):

(2.10 × 50%) - 1 = 5%

So the expected profit is:

$10 × 5% = $0.50

This does not mean you will earn $0.50 on that specific bet. You will either win or lose the bet. But over many similar bets, the average result moves closer to the expected value.

That is how ValueBet works.

The difficult part of ValueBet is understanding whether the odds offered by a sportsbook are higher than the fair value of an outcome.

NinjaBet simplifies this process by analyzing betting prices and highlighting situations where the odds appear to be more generous than they should be.

When the difference between the sportsbook price and the estimated fair value is large enough, the bet may have positive expected value.

This does not mean the bet is guaranteed to win. A ValueBet can still lose. It only means that, over many similar bets, the price may offer an advantage.

The purpose of the ValueBet tool is to help you find these opportunities faster, so you can focus on checking the event, the market, the odds, and the stake before placing the bet.

NinjaBet shows an EV percentage, which stands for Expected Value.

For example, if a ValueBet has an EV of 5%, it means that the bet is expected to return around 5% profit over many similar bets.

It does not mean that the bet will win.

It also does not mean that you will earn 5% on every single bet.

Some bets will win and some bets will lose. The EV percentage only becomes meaningful when repeated over a large number of bets.

This is why ValueBet should always be judged over the long term, not from one single result.

Variance and long-term results are explained in more detail in the next guide.

A ValueBet is not guaranteed to win.

Even if the odds are good, the bet can still lose. This is normal because each individual result is affected by chance.

The advantage of ValueBet appears over many bets, not necessarily over one bet, one day, or one small sample.

This is why ValueBet requires patience, discipline, and a proper bankroll.

The next guide explains variance, losing streaks, bankroll, and long-term results in more detail.

ValueBet is a strategy based on finding sportsbook odds that are more generous than the fair value of an outcome.

The goal is not to predict every result correctly. The goal is to place bets where the odds are profitable in the long term.

A ValueBet can lose. That is normal.

What matters is whether the odds were good compared to the real probability of the outcome.

ValueBet is not about guaranteed profit on each single bet. It is about gaining an edge and repeating that edge over many bets.