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Converts implied probability, decimal, fractional, and American odds in any direction, with the payout and profit on a 100-unit stake.

📘 How to Use

  1. Enter a value in any one field — probability, decimal, fractional, or American odds
  2. Watch the other three formats and the implied probability sync
  3. Read the payout and profit on a 100-unit stake

Odds Probability Converter

Implied probability
50.00 %
Decimal
2.00
Fractional
1/1
American
+100
Payout on a 100-unit stake
200.00 units

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※ Implied probability (%) = 100 / decimal odds. Bookmaker margin (vig) is not modeled

※ Real bookmakers add vig, so quoted implied probabilities sum above 100%

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Odds Probability Converter | Convert Probability and Three Odds Formats

Convert implied probability, decimal (European), fractional (UK), and American odds in any direction. Type one value and the other three sync, with the payout and profit on a 100-unit stake shown alongside.

💡 About this tool

If you bet on sports across different books, you have hit the wall where one site shows "5/2", another shows "3.50", and a third shows "+150" for what is essentially the same line. Switching mental gears between three notations every time you compare a price is slow and error-prone, especially when you are line-shopping between a UK book and a US one.

This tool puts all four formats on a single screen. Enter any one of them and the other three resolve as you type, plus the implied probability each price represents. That last number is the one sharp bettors actually care about: it tells you the break-even win rate a price is offering, so you can compare it against your own estimate of the outcome. The payout and profit figures on a 100-unit stake let you sanity-check the return without reaching for a calculator.

One thing to keep in mind: real sportsbooks bake their margin (the vig) into the posted odds, so the implied probabilities of all outcomes in a market add up to more than 100%. This tool works on the raw conversion math and does not strip out the vig.

🧐 Frequently Asked Questions

What does +150 mean in decimal odds? American +150 equals decimal 2.50. A plus price tells you the profit on a 100 stake, so +150 returns 150 profit (250 total) on 100 risked.

How do I read minus odds like -200? A minus price is the favorite. -200 means you risk 200 to win 100 profit, which converts to decimal 1.50 and an implied probability of about 66.7%.

Why do the implied probabilities add up to over 100%? That overround is the book's margin. Two even-looking sides priced at 1.90 each imply 52.6% + 52.6% = 105.2%; the extra 5.2% is the house edge built into the line.

What is the difference between payout and profit? Payout is your total return including the stake; profit is what is left after subtracting the stake. At decimal 2.00, a 100 stake returns 200 payout and 100 profit.

How precise is the fractional conversion? Fractional odds are rounded to the nearest clean fraction with a denominator up to 100, then reduced. Some decimal prices have no exact fraction, so the displayed fraction is the closest standard one rather than an infinite repeating value.

📚 Why three formats exist at all

The three notations are essentially regional accents for the same math. Fractional odds are the old language of British racecourses, where prices were chalked onto boards as "9/4". Decimal odds caught on across continental Europe and Australia because the single number already includes your stake, making the total return obvious. American odds anchor everything to a 100-unit bet and use the plus/minus sign as visual shorthand for underdog versus favorite. Once you can read all three, you stop being locked into a single market and can shop the same outcome wherever the price is best.