How to Read Esports Odds

Every betting decision you make revolves around odds. They determine your potential payout, reflect the bookmaker's estimate of probability, and reveal where value exists. If you cannot read odds fluently, you are flying blind. This guide will make you completely comfortable with all three major odds formats and teach you to convert between them instantly.

Esports bookmakers predominantly use decimal odds (also called European odds), which is the format most bettors encounter first. However, you will also see American odds at US-facing sportsbooks and fractional odds at UK-focused bookmakers. Every licensed bookmaker lets you switch between formats in your account settings, but understanding all three empowers you to use any platform and any resource worldwide.

Decimal odds are the standard in esports betting and the most intuitive format to work with. The number shown represents the total return per unit staked, including your original stake.

How to Calculate Your Payout

The formula is simple: Payout = Stake x Odds

Example: NAVI are listed at 1.75 to beat FaZe Clan in a CS2 match. You stake $20.

• Total return: $20 x 1.75 = $35.00
• Profit: $35.00 - $20.00 = $15.00

Reading the Numbers

Decimal odds always include your stake in the return. Key reference points:

• Odds of 2.00 = even money. You double your stake if you win.
• Odds below 2.00 = the team is the favorite. Lower odds mean a higher implied probability.
• Odds above 2.00 = the team is the underdog. Higher odds mean a lower implied probability but a larger potential payout.
• Odds of 1.10 = a heavy favorite. Very high implied probability but tiny profit margin.
• Odds of 5.00 = a significant underdog. Only 20% implied chance but 4x profit if correct.

Real Esports Examples

Consider a League of Legends LCK match: T1 at 1.40 vs Gen.G at 2.90. These odds tell you the bookmaker considers T1 roughly a 71% favorite and Gen.G roughly a 34% chance (before removing the margin). A $50 bet on Gen.G would return $145 if they win (a $95 profit), while the same stake on T1 returns just $70 ($20 profit).

Fractional odds are expressed as a fraction (e.g., 3/1, 5/2, 4/7) and are traditional in the UK. They show the profit relative to your stake, not the total return.

How to Calculate Your Payout

Formula: Profit = Stake x (Numerator / Denominator)

Example: Team Spirit at 5/2 in a Dota 2 match. You stake $10.

• Profit: $10 x (5/2) = $25.00
• Total return: $25.00 + $10.00 = $35.00

Reading the Numbers

• 3/1 ("three to one") = for every $1 you stake, you profit $3. The team is an underdog.
• 1/1 ("evens") = you profit $1 for every $1 staked. Equivalent to decimal 2.00.
• 1/3 ("one to three") = you profit $1 for every $3 staked. Heavy favorite.
• 5/2 ("five to two") = you profit $5 for every $2 staked. Moderate underdog.

Fractional odds are less common in esports betting, but you will encounter them at some UK bookmakers. Most bettors find decimal odds more convenient for quick calculations.

American odds use positive and negative numbers and are standard at US sportsbooks. They work differently for favorites (negative) and underdogs (positive).

Negative Odds (Favorites)

Negative odds show how much you need to stake to win $100.

Example: Sentinels at -175 in a Valorant match. You need to stake $175 to profit $100. A $50 stake would profit $28.57 ($50 / 175 x 100).

Positive Odds (Underdogs)

Positive odds show how much profit you make on a $100 stake.

Example: Paper Rex at +250. A $100 stake profits $250 if they win. A $40 stake profits $100 ($40 x 250 / 100).

American Odds Reference Points

• -100 / +100 = even money (equivalent to decimal 2.00)
• -200 = strong favorite (equivalent to decimal 1.50)
• +300 = significant underdog (equivalent to decimal 4.00)
• -500 = very heavy favorite (equivalent to decimal 1.20)

Being able to convert between formats is essential when comparing odds across different bookmakers or reading analysis from different regions. Here are the key formulas:

Decimal to Fractional

Subtract 1 from the decimal odds and express as a fraction. Decimal 2.50 becomes 1.50/1, simplified to 3/2.

Decimal to American

If decimal odds are 2.00 or above: American = (Decimal - 1) x 100. Decimal 3.00 = +200.

If decimal odds are below 2.00: American = -100 / (Decimal - 1). Decimal 1.50 = -200.

American to Decimal

Positive American: Decimal = (American / 100) + 1. +250 = 3.50.

Negative American: Decimal = (100 / |American|) + 1. -150 = 1.667.

Conversion Table

Implied probability is the cornerstone of intelligent betting. It converts odds into a percentage, telling you what the bookmaker believes about the likelihood of each outcome.

The Formula

For decimal odds: Implied Probability = (1 / Decimal Odds) x 100

Example: G2 are priced at 1.65 to beat Heroic in a CS2 match. Implied probability = (1 / 1.65) x 100 = 60.6%. The bookmaker believes G2 has roughly a 61% chance of winning.

The Overround (Bookmaker's Margin)

If you add up the implied probabilities of all outcomes in a market, they will total more than 100%. The excess is the bookmaker's margin. For example:

• G2 at 1.65 = 60.6%
• Heroic at 2.30 = 43.5%
• Total: 104.1% (4.1% overround)

Lower overround means better value for bettors. Pinnacle typically runs 2-3% margins on tier-1 esports, while some bookmakers run 6-8%.

Finding Value

A value bet exists when you believe the true probability of an outcome is higher than the implied probability suggested by the odds. If the bookmaker prices Heroic at 2.30 (43.5% implied), but your analysis suggests Heroic actually has a 50% chance, that is a value bet. Over time, consistently finding and betting on value is the only way to profit. Our value betting guide covers this in full detail.

Odds are not static. They change from the moment a market opens until the match begins (and during the match for live betting). Understanding why odds move is a valuable skill.

What Causes Odds to Move?

• Money flow: When a large volume of bets is placed on one outcome, bookmakers shorten those odds to manage their liability and lengthen the other side. This is the most common cause of odds movement.
• Sharp action: Professional bettors (sharps) tend to bet early. When sharps back one side, bookmakers respect their judgment and move the line quickly. If you see a significant odds shift shortly after a market opens, it is often driven by sharp money.
• News and information: Roster changes, player illness, travel issues, or leaked scrimmage results can all trigger odds movement. This is why following team news closely gives you an edge.
• Bookmaker adjustment: Sometimes the original odds are simply wrong, and the bookmaker corrects them based on their own further analysis.

Steam and Reverse Steam

A "steam move" is a sharp, sudden odds shift across multiple bookmakers simultaneously, usually triggered by a major sharp bettor or syndicate. A "reverse steam" is when the line moves despite public money going the opposite direction, suggesting sharp money is on the other side.

Practical Application

If you form your opinion before the market opens and the odds move in your favor (meaning the price on your preferred side goes up), that is a positive signal. If the odds move against you (the price on your side drops), consider whether you may have missed something. The market is not always right, but it is right more often than not. Tracking whether you consistently beat the closing line is the best measure of betting skill. See our line shopping guide for practical tools.

Test your understanding with these scenarios:

Exercise 1: Calculate the Payout

Team Vitality are priced at 2.10 to beat MOUZ. You stake $30. What is your total return if Vitality win? What is your profit?

Answer: Total return = $30 x 2.10 = $63.00. Profit = $63.00 - $30.00 = $33.00.

Exercise 2: Convert Odds

A US sportsbook has LOUD at +180 to win a Valorant match. What is this in decimal odds?

Answer: Decimal = (180 / 100) + 1 = 2.80.

Exercise 3: Calculate Implied Probability

BLG are at 1.55 to beat JDG in an LPL match. What implied probability do these odds suggest?

Answer: (1 / 1.55) x 100 = 64.5%.

Exercise 4: Spot the Overround

Bookmaker offers: Team Spirit at 1.90, Tundra at 1.95 in a Dota 2 match. What is the overround?

Answer: (1/1.90 + 1/1.95) x 100 = 52.6% + 51.3% = 103.9%. The overround is 3.9%.

Exercise 5: Is This a Value Bet?

Your analysis gives Fnatic a 45% chance to beat Sentinels. The bookmaker offers Fnatic at 2.40 (implied 41.7%). Is this a value bet?

Answer: Yes. Your estimated probability (45%) is higher than the implied probability (41.7%). The expected value is positive.