- Tennis
- Oct 26, 3:30 PM
J. Mensik to win
L. Neumayer vs J. Mensik
Open J. Mensik to win free signalFree Odds Calculator & Converter
Convert between American, decimal, and fractional odds instantly. The calculator shows implied probability and the payout on a $100 bet.
Enter odds in any format above to see instant conversions and implied probability.
Understanding Betting Odds Formats
American Odds (Moneyline)
American odds use a +/- system based on $100. Positive odds (e.g. +150) show your profit on a $100 bet. Negative odds (e.g. -110) show how much you need to bet to win $100.
Decimal Odds
Decimal odds represent your total return per unit wagered, including your stake. Odds of 2.50 mean you receive $2.50 for every $1 bet (profit of $1.50). Decimal odds are common in Europe and Australia.
Fractional Odds
Fractional odds (e.g. 3/1) show profit relative to stake. A 3/1 bet wins $3 for every $1 wagered. These are popular in UK horse racing and traditional betting markets.
Quick Conversion Reference
| American | Decimal | Fractional | Implied Prob. |
|---|---|---|---|
| -500 | 1.20 | 1/5 | 83.3% |
| -450 | 1.22 | 2/9 | 81.8% |
| -400 | 1.25 | 1/4 | 80.0% |
| -350 | 1.29 | 2/7 | 77.8% |
| -300 | 1.33 | 1/3 | 75.0% |
| -275 | 1.36 | 4/11 | 73.3% |
| -250 | 1.40 | 2/5 | 71.4% |
| -225 | 1.44 | 4/9 | 69.2% |
| -200 | 1.50 | 1/2 | 66.7% |
| -188 | 1.53 | 8/15 | 65.2% |
| -175 | 1.57 | 4/7 | 63.6% |
| -162 | 1.62 | 8/13 | 61.9% |
| -150 | 1.67 | 4/6 | 60.0% |
| -137 | 1.73 | 8/11 | 57.9% |
| -125 | 1.80 | 4/5 | 55.6% |
| -120 | 1.83 | 5/6 | 54.5% |
| -110 | 1.91 | 10/11 | 52.4% |
| +100 | 2.00 | 1/1 | 50.0% |
| +110 | 2.10 | 11/10 | 47.6% |
| +120 | 2.20 | 6/5 | 45.5% |
| +125 | 2.25 | 5/4 | 44.4% |
| +138 | 2.38 | 11/8 | 42.1% |
| +150 | 2.50 | 6/4 | 40.0% |
| +163 | 2.63 | 13/8 | 38.1% |
| +175 | 2.75 | 7/4 | 36.4% |
| +188 | 2.88 | 15/8 | 34.8% |
| +200 | 3.00 | 2/1 | 33.3% |
| +225 | 3.25 | 9/4 | 30.8% |
| +250 | 3.50 | 5/2 | 28.6% |
| +275 | 3.75 | 11/4 | 26.7% |
| +300 | 4.00 | 3/1 | 25.0% |
| +333 | 4.33 | 10/3 | 23.1% |
| +350 | 4.50 | 7/2 | 22.2% |
| +400 | 5.00 | 4/1 | 20.0% |
| +450 | 5.50 | 9/2 | 18.2% |
| +500 | 6.00 | 5/1 | 16.7% |
| +600 | 7.00 | 6/1 | 14.3% |
| +700 | 8.00 | 7/1 | 12.5% |
| +800 | 9.00 | 8/1 | 11.1% |
| +1000 | 11.00 | 10/1 | 9.1% |
| +1200 | 13.00 | 12/1 | 7.7% |
| +1600 | 17.00 | 16/1 | 5.9% |
| +2000 | 21.00 | 20/1 | 4.8% |
Odds Calculator & Converter FAQ
What are American odds?
American odds (also called moneyline odds) use positive and negative numbers. Positive odds like +200 mean you win $200 profit on a $100 bet. Negative odds like -150 mean you must bet $150 to win $100 profit. They're the standard format at US sportsbooks.
How do I convert American odds to decimal?
For positive odds: divide by 100 and add 1. Example: +200 = (200/100) + 1 = 3.00. For negative odds: divide 100 by the absolute value and add 1. Example: -150 = (100/150) + 1 = 1.667.
What is implied probability?
Implied probability is the chance of winning implied by the odds. For +200 odds: 100 / (200 + 100) = 33.3%. For -150 odds: 150 / (150 + 100) = 60%. When your estimated probability exceeds the implied probability, that's a positive expected value bet.
What's the difference between decimal and fractional odds?
Decimal odds include your stake in the return (2.50 means you get $2.50 back per $1 wagered, $1.50 profit). Fractional odds show profit only (3/2 means $1.50 profit per $1 staked). Decimal odds are easier for probability calculations.
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