The absolute biggest barrier to entry for any new sports bettor is looking at a massive, flashing sportsbook screen for the very first time. It looks less like a sports game and more like a highly complex Wall Street trading terminal. There are numbers everywhere. If you don’t understand the math, you are essentially walking into a massive casino completely blind. You won’t know who is supposed to win, you won’t know exactly how much money you have to risk, and you won’t know your profit. Although it looks like complex math, they are just three ways to say the same thing. This article will translate the board for you, teaching you exactly how to instantly read and calculate American Odds, Decimal Odds, and Fractional Odds.
In the USA, you will almost exclusively see American Odds (often called the Moneyline). This system is entirely built around the absolute baseline number of $100. It uses symbols to show the favorite and the underdog.
If you bet in Europe or Asia, the +/- system does not exist. They use Decimals. Decimal odds are widely considered the absolute easiest, most logical system in the entire world, because you do not have to worry about the base-$100 math.

| The Math | How to Calculate It |
|---|---|
| The Multiplier | Decimal odds represent the total, massive payout you will receive for every $1 you bet. This number already completely includes your original stake. You simply take your bet amount and multiply it by the decimal. It is that simple. |
| The Math in Action | 100 x 2.50 = 250. The math is incredibly fast. |
If you are betting in the United Kingdom, or if you bet on horse racing, you will use the old system: Fractional Odds (e.g., 5/1 or 1/2). While they look like complex middle-school math, the math is basic.
In conclusion, no matter which system you prefer, a decimal in Europe, or a fraction at the track, the absolute, underlying mathematical probability is exactly the same. Most online casinos will allow you to simply go into your account settings and switch the display format to whichever system your brain naturally processes the fastest. The key to success is knowing the price. Once you know the math, and know your payout, you are officially a sports bettor.
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