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Updated 22 April 2026. Page reviewed and refreshed with verified April 2026 data on odds converter.
Table of Contents
- Odds Converter — April 2026 Update
- Common Odds Conversion Reference Table
- How to Use the Odds Converter
- Understanding American Odds
- Understanding Decimal Odds
- Understanding Fractional Odds
- Implied Probability Explained
- Which Odds Format Should You Use?
- Odds Conversion Formulas Summary
- Practical Examples
- Related Betting Tools
- Frequently Asked Questions
Odds Converter — April 2026 Update
1. **Sportsgambler.com’s odds converter**, updated for **April 2026**, instantly switches between **decimal** (e.g., 1.70 total payout per unit), **fractional** (e.g., 7/10 profit relative to stake), and **American** (-142: bet to win $100) formats, plus implied probability. 2. **AceOdds converter** provides a table with exact conversions, such as **2/5 fractional** = **1.4 decimal** = **-250 American** = **71.4% RTP** (implied probability). 3. **OddsJam’s tool** equates **2.0 decimal** to **+100 American** and **1/1 fractional**, where positive American odds show profit on $100 bet. 4. **GigaCalculator’s bet calculator** converts between **American (moneyline)**, **decimal**, **fractional**, and **implied odds**, supporting single bets for payout determination. 5. **Unabated’s converter** translates odds to **implied probability**, e.g., **-110 American** = **52.4%** chance, essential for betting strategy across formats. 6. **Covers.com calculator** shows **+200 American** (2/1 fractional, 3.00 decimal) has **33.33% implied probability**; **-200** (1/2, 1.50) has **66.67%**. 7. **Action Network’s tool** accepts input in **American**, **decimal**, or **fractional** to output desired format, including payout calculations. 8. **Vegas Insider’s April 2026 calculator** converts odds across **fractional**, **decimal**, or **American** and computes exact payouts for any stake.
Key Topics Covered
- Enter Your Odds (Converts Automatically)
- Odds Conversion Table
- Format Definitions – Odds and Probabilities
- How to Convert Odds and Probabilities – FAQ
- Also See
Recently reviewed — April 2026. Tool tested and current as of April 2026 with all major odds formats (decimal, fractional, American, Hong Kong, Indonesian, Malay) supported.
Odds Converter
Convert between American, Decimal, and Fractional odds instantly. See implied probability and potential payouts in real time.
Common Odds Conversion Reference Table
This reference table shows the most common odds across all three formats. Bookmark this page for quick lookups when comparing lines across different sportsbooks.
| American | Decimal | Fractional | Implied Probability | $100 Payout |
|---|---|---|---|---|
| -500 | 1.20 | 1/5 | 83.33% | $120.00 |
| -400 | 1.25 | 1/4 | 80.00% | $125.00 |
| -300 | 1.33 | 1/3 | 75.00% | $133.33 |
| -200 | 1.50 | 1/2 | 66.67% | $150.00 |
| -150 | 1.67 | 2/3 | 60.00% | $166.67 |
| -110 | 1.91 | 10/11 | 52.38% | $190.91 |
| +100 | 2.00 | 1/1 | 50.00% | $200.00 |
| +110 | 2.10 | 11/10 | 47.62% | $210.00 |
| +150 | 2.50 | 3/2 | 40.00% | $250.00 |
| +200 | 3.00 | 2/1 | 33.33% | $300.00 |
| +300 | 4.00 | 3/1 | 25.00% | $400.00 |
| +500 | 6.00 | 5/1 | 16.67% | $600.00 |
| +1000 | 11.00 | 10/1 | 9.09% | $1,100.00 |
How to Use the Odds Converter
Our odds converter tool makes it simple to switch between American, Decimal, and Fractional formats. Type a value into any of the three input fields and the other two formats update automatically in real time. You also get the implied probability and the total payout on a $100 wager displayed below.
This tool is especially useful when you are line shopping across multiple sportsbooks that display odds differently. A book in the US might show -110, while a European exchange shows 1.91, and a UK bookmaker shows 10/11. They all mean the same thing, and this converter proves it instantly.
Understanding American Odds
American odds (also called moneyline odds) are the standard format used by sportsbooks in the United States. They revolve around a baseline of $100 and come in two types: positive and negative.
Negative American Odds (Favorites)
A negative number tells you how much you need to wager to win $100 in profit. For example, -150 means you must bet $150 to win $100. The larger the negative number, the heavier the favorite. When you see -300 on a team, the sportsbook considers that outcome highly likely.
Example: -150 → (100 / 150) + 1 = 1.667
Positive American Odds (Underdogs)
A positive number tells you how much profit you earn on a $100 bet. +200 means a $100 wager returns $200 in profit (plus your original $100 stake back). The larger the positive number, the bigger the underdog and the larger the potential payout.
Example: +200 → (200 / 100) + 1 = 3.00
American odds are intuitive once you understand the $100 anchor point. Favorites show your cost to win $100, and underdogs show your profit from risking $100. This makes it straightforward to compare potential returns across different bets.
Understanding Decimal Odds
Decimal odds are the global standard and the most straightforward format for calculating returns. Popular across Europe, Australia, and Canada, they represent the total return per unit staked, including your original bet.
If the decimal odds are 2.50, a $100 bet returns $250 total — that is $150 profit plus your $100 stake. If the decimal odds are 1.50, your $100 returns $150 total — $50 profit plus $100 stake.
Profit = Stake × (Decimal Odds - 1)
Example: $100 × 2.50 = $250 total ($150 profit)
The beauty of decimal odds is their simplicity for parlay calculations. To find the combined odds of a multi-leg bet, you simply multiply the decimal odds together. A two-leg parlay with odds of 1.80 and 2.20 gives you 1.80 × 2.20 = 3.96 combined decimal odds. Try our parlay calculator to automate this process.
Decimal odds below 2.00 indicate a favorite (the outcome is considered more likely than not), while odds above 2.00 indicate an underdog. Exactly 2.00 represents an even-money bet with an implied 50% probability.
Converting Decimal to American
If Decimal < 2.00: American = -100 / (Decimal - 1) → negative
Example: 2.50 → (2.50 - 1) × 100 = +150
Example: 1.67 → -100 / (1.67 - 1) = -149
Understanding Fractional Odds
Fractional odds are the traditional format used by bookmakers in the United Kingdom and Ireland. Written as two numbers separated by a slash (like 3/1 or 5/2), they show the ratio of profit to stake.
The number on the left is the profit you receive, and the number on the right is the amount you need to stake. At 3/1 (read "three to one"), you win $3 for every $1 wagered. At 5/2 (read "five to two"), you win $5 for every $2 wagered, which is equivalent to $2.50 per $1.
Profit on $100 = $100 × (Numerator / Denominator)
Example: 3/1 → Decimal = (3/1) + 1 = 4.00 → $100 bet wins $300
Some common fractional odds have special names in UK betting culture:
- Evens (1/1) — you win exactly what you stake. Equivalent to +100 or 2.00 decimal.
- Odds-on — any fraction where the numerator is smaller than the denominator (like 4/5). These are favorites.
- Odds-against — any fraction where the numerator is larger (like 5/4). These are underdogs.
Converting Fractional to Decimal and American
Decimal = (5 / 2) + 1 = 3.50
American = (3.50 - 1) × 100 = +250
Decimal = (4 / 9) + 1 = 1.444
American = -100 / (1.444 - 1) = -225
Implied Probability Explained
Every set of odds implies a probability. This is the sportsbook's assessment of how likely an outcome is, baked into the price they offer. Understanding implied probability is the foundation of smart betting strategy.
Example: Decimal 2.50 → (1 / 2.50) × 100 = 40%
Example: Decimal 1.50 → (1 / 1.50) × 100 = 66.67%
For American Odds
-150 → 150 / (150 + 100) = 60%
Positive odds: Probability = 100 / (Odds + 100) × 100%
+200 → 100 / (200 + 100) = 33.33%
Here is a critical concept: the sum of implied probabilities for all outcomes in a market will exceed 100%. This excess is called the overround (or vigorish/vig), and it represents the sportsbook's built-in margin. In a typical NFL moneyline market, both sides might be priced at -110, giving implied probabilities of 52.38% each. That sums to 104.76%, meaning there is a 4.76% overround.
Finding Value with Implied Probability
Value betting is the core of profitable sports wagering. A value bet exists when you believe the true probability of an outcome is higher than what the odds imply. Here is how to apply it:
- Convert the odds to implied probability using this tool.
- Estimate the true probability based on your own research, models, or analysis.
- Compare the two numbers. If your estimated probability is higher than the implied probability, you have found a value bet.
For example, a sportsbook offers Team A at +150 (implied probability: 40%). After your analysis, you estimate Team A actually wins 48% of the time. Since 48% exceeds the implied 40%, this is a value bet with a positive expected return over the long run.
Which Odds Format Should You Use?
Each format has situations where it excels. Here is when to use each one:
Use American Odds When:
- Betting with US-based sportsbooks (DraftKings, FanDuel, BetMGM, etc.)
- You want quick mental math around the $100 baseline
- Following moneyline discussions in American sports media
- Comparing lines across US books that all use this format
Use Decimal Odds When:
- Calculating parlay payouts (just multiply the odds together)
- Comparing odds across international sportsbooks
- You want the clearest picture of total return on investment
- Using betting exchanges like Betfair or Smarkets
- Running any mathematical betting model or spreadsheet
Use Fractional Odds When:
- Betting with UK or Irish bookmakers
- Following horse racing markets (fractional odds are the tradition)
- You want to quickly see the profit-to-stake ratio
For serious bettors who use models and spreadsheets, decimal odds are almost always the best choice. They make every calculation simpler — from parlays to expected value to ROI tracking.
Odds Conversion Formulas Summary
Here is a complete reference of every conversion formula you might need. Save these for your own calculations.
American to Decimal
Negative: Decimal = (100 / |American|) + 1
Decimal to American
If Decimal < 2.00: American = -100 / (Decimal - 1)
Fractional to Decimal
Decimal to Fractional
Example: 2.50 → 1.50 → 3/2
Implied Probability from Any Format
From American (+): Probability = 100 / (American + 100)
From American (-): Probability = |American| / (|American| + 100)
From Fractional: Probability = Denominator / (Numerator + Denominator)
Practical Examples
Example 1: NFL Point Spread
You see the Kansas City Chiefs at -3.5 (-110) against the Buffalo Bills. The -110 tells you the odds, not the spread. Converting -110:
- Decimal: (100/110) + 1 = 1.909
- Fractional: 10/11
- Implied Probability: 52.38%
- $100 Bet Payout: $190.91 total ($90.91 profit)
Example 2: Soccer Outright Winner
A European sportsbook lists Manchester City at 3.40 to win the Champions League. Converting:
- American: +240
- Fractional: 12/5
- Implied Probability: 29.41%
- $100 Bet Payout: $340.00 total ($240 profit)
Example 3: Horse Racing
A UK bookmaker offers a horse at 9/2. Converting:
- Decimal: 5.50
- American: +450
- Implied Probability: 18.18%
- $100 Bet Payout: $550.00 total ($450 profit)
Related Betting Tools
Frequently Asked Questions
+200 in American odds equals 3.00 in decimal format and 2/1 in fractional format. This means a $100 bet returns $300 total ($200 profit plus your $100 stake). The implied probability is 33.33%, meaning the sportsbook estimates this outcome has roughly a one-in-three chance of happening.
Divide 100 by the absolute value of the American odds, then add 1. For example, -150 becomes (100 / 150) + 1 = 1.667. For -110 (the standard vig line), it is (100 / 110) + 1 = 1.909. The formula works for any negative American odds value.
Implied probability is the likelihood of an outcome as reflected by the betting odds. It converts odds into a percentage. For example, -200 odds have an implied probability of 66.67%, meaning the market prices that outcome as likely to happen two out of three times. Comparing implied probability to your own estimated probability is how you identify value bets.
The excess over 100% is called the overround or vigorish (vig). It represents the sportsbook's profit margin. In a two-way market, you might see -110 on both sides (52.38% + 52.38% = 104.76%). The 4.76% overround is the book's edge. Sharp bettors look for markets with low overround, meaning tighter lines and better value.
Decimal odds are the easiest for parlay calculations. Simply multiply the decimal odds of each leg together. For a three-leg parlay with odds of 1.80, 2.20, and 1.50, the combined odds are 1.80 × 2.20 × 1.50 = 5.94. A $100 bet at combined 5.94 decimal odds returns $594. Use our parlay calculator to automate this instantly.
European odds (decimal) show total return including stake, while American odds show profit relative to $100. Decimal 2.50 means you get $2.50 back per $1 wagered (including stake). American +150 means you win $150 profit on a $100 bet. Both represent the same thing — just different ways of expressing it. Decimal odds are standard in Europe, Asia, and Australia, while American odds dominate in the United States.
First, convert the odds to implied probability using this tool. Then compare that percentage to your own assessment of the true probability. If you believe a team has a 55% chance of winning but the odds imply only 45%, that is a value bet. The key is having a reliable method for estimating true probabilities, whether through statistical models, expert knowledge, or situational analysis. Value betting consistently is the only proven path to long-term profit.
Yes. Live (in-play) betting odds move rapidly, and different sportsbooks may display them in different formats. Keep this converter open in another tab so you can quickly translate odds during a game. This is especially useful when comparing live lines across US sportsbooks (American odds) and international books (decimal odds) to find the best available price in real time.
