American Odds Explained: How +150 and -200 Actually Work (Beginner Guide for 2026)
- Adam Gregory
- Mar 12
- 4 min read
If you’ve ever looked at a sportsbook and seen odds like +150 or -200, you’ve already encountered American odds.
For beginners, this format can be confusing. Unlike decimal odds, American odds use positive and negative numbers, and each one requires a different way of calculating profit.
Once you understand the logic behind them, though, American odds are actually very simple.
In this guide you'll learn:
• what American odds are
• what positive and negative odds mean
• how to calculate profit instantly
• how sportsbooks use them to price favorites and underdogs
• why matched bettors often convert them to decimal odds
What Are American Odds?
American odds show how much you win relative to $100.
But the calculation changes depending on whether the number is positive or negative.
Positive odds show how much profit you make from a $100 bet.
Negative odds show how much you must bet to win $100.
This difference is what makes American odds confusing at first.
Once you understand the two types, the system becomes much easier.
Positive American Odds (+150, +200, +300)
Positive odds represent underdogs.
They tell you how much profit you make if you bet $100.
Example:
+150
This means:
Bet $100 → profit $150.
Your total payout would be:
$250($150 profit + $100 stake)
Example table:
Odds | Stake | Profit | Total Return |
+150 | $100 | $150 | $250 |
+200 | $100 | $200 | $300 |
+300 | $100 | $300 | $400 |
Positive odds mean the team is less likely to win, so the sportsbook offers a larger payout.
Negative American Odds (-150, -200, -300)
Negative odds represent favorites.
They show how much you must bet to win $100 profit.
Example:
-200
This means:
You must bet $200 to win $100.
Your total payout would be:
$300($100 profit + $200 stake)
Example table:
Odds | Stake Needed | Profit | Total Return |
-150 | $150 | $100 | $250 |
-200 | $200 | $100 | $300 |
-300 | $300 | $100 | $400 |
The stronger the favorite, the larger the negative number becomes.
Why Sportsbooks Use Positive and Negative Odds
American odds are designed to quickly show which team is favored.
Favorites have negative odds.
Underdogs have positive odds.
Example market:
Team | Odds |
Chiefs | -180 |
Raiders | +150 |
The Chiefs are the favorite.
The Raiders are the underdog.
The sportsbook is telling bettors the Chiefs are more likely to win.
Converting American Odds to Decimal Odds
Many experienced bettors convert American odds to decimal odds because they are easier to calculate with.
Example conversions:
American | Decimal |
+150 | 2.50 |
+200 | 3.00 |
-200 | 1.50 |
-150 | 1.67 |
Decimal odds show the total payout per $1 wagered, which makes comparing bets much easier.
If you want to understand that format, read:
Matched bettors almost always convert odds to decimal format before calculating bets.
What American Odds Reveal About Probability
Odds don’t just show payouts.
They also reveal the implied probability of an outcome.
Example:
+100 odds represent a 50% probability.
+200 odds represent about 33% probability.
-200 odds represent about 67% probability.
Sportsbooks build a margin into these probabilities to ensure long-term profit.
Understanding implied probability helps bettors determine whether odds offer real value.
We'll cover this in detail in:
Why Matched Bettors Often Avoid American Odds
While American odds are common in the U.S., they aren’t ideal for matched betting calculations.
Matched bettors typically convert them into decimal odds before placing bets because decimal odds make it easier to:
• calculate returns
• determine lay stakes
• estimate free bet conversion values
Matched betting relies on precise calculations, so simplifying the odds format saves time and reduces mistakes.
If you're new to the strategy, read:
A Real Example Using American Odds
Let’s walk through a real sportsbook example.
Odds:
Team A +180
You place a $100 bet.
If the team wins:
Profit = $180Total return = $280
Now imagine you hedge that bet using a lay bet on a betting exchange.
When both bets are balanced correctly, the outcome of the game no longer matters.
This is the core idea behind matched betting.
If you're unfamiliar with lay bets, read:
Common Beginner Mistakes With American Odds
Most beginners struggle with American odds because they make a few common mistakes.
Forgetting the negative odds rule
Negative odds show the amount required to win $100 — not the profit.
Mixing odds formats
Comparing American odds to decimal odds without converting them leads to mistakes.
Misunderstanding sportsbook margins
Sportsbooks adjust odds slightly to guarantee profit over time.
Understanding these details helps bettors make better decisions.
Why Understanding Odds Changes How You Bet
Most casual bettors never learn how odds actually work.
They simply place bets and hope for the best.
But once you understand odds formats and probabilities, you begin to see how sportsbooks price events and where promotions create profitable opportunities.
That knowledge is exactly what matched bettors use to turn sportsbook bonuses into predictable profits.
Turn Sportsbook Promotions Into Guaranteed Profit
Instead of relying on luck, matched bettors use sportsbook bonuses and betting exchanges to create risk-free opportunities.
The hardest part for beginners is finding the best promotions and calculating the correct bets.
That’s exactly what OddsMatched was designed to solve.
Our platform helps bettors:
• find the most profitable sportsbook bonuses
• calculate perfect back and lay bets instantly
• track every matched betting opportunity
• convert free bets into real cash
If you're serious about learning matched betting, the best way to start is with the right tools.
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