Odds Calculator
Convert between American, Decimal and Fractional odds instantly, and see the implied probability behind any price. Type into any field — the other two update automatically.
How to read betting odds
American odds
Shown as a positive or negative number relative to a $100 stake. +150 means a $100 bet returns $150 profit. -110 means you must stake $110 to win $100 profit.
Decimal odds
The most common format outside the US. It shows your total payout (stake plus profit) per $1 staked. Odds of 2.50 return $2.50 for every $1 bet, including your original stake.
Fractional odds
Common in the UK, written as profit/stake. Odds of 10/11 mean an $11 stake profits $10 if it wins, on top of getting your stake back.
Implied probability & the vig
Implied probability is how likely the odds say an outcome is to happen. Books add a margin (the "vig" or "juice"), so the probabilities on both sides of a bet usually add up to slightly more than 100% — that overround is the sportsbook's built-in edge.
How to use the odds calculator
Pick any field — American, Decimal or Fractional — and type in the number you have. The other two formats and the implied probability update the moment you stop typing, so you can instantly see what a price like -150 or 7/2 actually means, or compare how the same odds are quoted across different CS2 and esports betting sites.
This is especially useful when comparing bonuses and lines across the best CS2 match betting sites — some display American odds, others decimal, and the calculator lets you line them up side by side before placing a bet. Once you've found a price you like, the bet slip calculator works out the exact payout for a single bet or a multi-leg parlay.
Common odds converted
A quick reference for the odds you'll see most often, already converted across all three formats.
| American | Decimal | Fractional | Implied probability |
|---|---|---|---|
| +500 | 6.00 | 5/1 | 16.67% |
| +300 | 4.00 | 3/1 | 25.00% |
| +200 | 3.00 | 2/1 | 33.33% |
| +150 | 2.50 | 3/2 | 40.00% |
| +100 (Even) | 2.00 | 1/1 | 50.00% |
| -110 | 1.91 | 10/11 | 52.38% |
| -150 | 1.67 | 2/3 | 60.00% |
| -200 | 1.50 | 1/2 | 66.67% |
| -300 | 1.33 | 1/3 | 75.00% |
| -500 | 1.20 | 1/5 | 83.33% |
Frequently asked questions
What's the difference between American, Decimal, and Fractional odds?
They're three ways of showing the same price. American odds are relative to a $100 stake (+150 / -110), Decimal odds show your total payout per $1 staked (2.50), and Fractional odds show profit relative to stake as a fraction (3/2). All three convert into each other exactly — none of them is "better," they're just regional conventions.
How do you convert American odds to Decimal odds?
For positive American odds: decimal = (American ÷ 100) + 1. For negative American odds: decimal = (100 ÷ absolute value of American) + 1. For example, +150 becomes (150 ÷ 100) + 1 = 2.50, and -110 becomes (100 ÷ 110) + 1 ≈ 1.91.
What does -110 mean in betting?
-110 means you need to stake $110 to profit $100 if the bet wins (you'd get $210 back in total). It's the most common "standard" price for a roughly 50/50 line, and the reason it isn't exactly even money is the sportsbook's built-in margin.
Why do implied probabilities add up to more than 100%?
Because sportsbooks price in a margin, often called the "vig" or "juice." If both sides of a two-way market are priced at -110, each side implies 52.38% — a combined 104.76%. That extra 4.76% is the book's theoretical edge over bettors on that market.
What are "Evens" odds?
Evens (also written as "Even") means a straight double-your-money bet with no margin baked in: +100 American, 2.00 Decimal, or 1/1 Fractional. A $100 stake profits exactly $100, implying a 50% probability.
Which odds format should I use?
Whichever your sportsbook or gambling site displays by default — most CS2 and esports betting platforms let you switch formats in settings. Decimal is generally the easiest to do quick payout math with (payout = stake × decimal odds), which is why it's the default on most crypto and skin betting sites.
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