Free tools
Odds Converter
Convert a price between American, decimal and fractional odds, and see the win probability it implies.
Free, no account needed. Informational, not betting advice. 21+.
Results
- Implied probability
- 52.38%
- American
- -110
- Decimal
- 1.91
- Fractional
- 10/11
Implied probability is the break-even win rate for this price. It still includes the book’s margin.
How it works
Every format describes the same thing: how much you get back for what you risk. Decimal odds are the total return per $1 staked. American odds show the profit on $100 for a plus price, or the stake needed to win $100 for a minus price. Fractional odds show profit over stake. Implied probability is 1 divided by the decimal price: the win rate you would need just to break even.
Worked example
−110 means risk $110 to win $100. That is 1.91 in decimal, 10/11 in fractional, and 52.38% implied.
When to use it
A check reads the price from your slip in whatever format the book used. Convert when a book, a friend or a model quotes a price in a different format and you want to compare like with like before you place the bet.
Questions
Why do the implied probabilities across a market add to more than 100%?
Because the book builds its fee into both sides. −110 on each side of a spread implies 52.38% twice, or 104.76% in total. The extra is the vig. The No-Vig and Vig tools remove it.
Does +100 equal −100?
Yes. Both are even money: decimal 2.00, fractional 1/1, 50% implied. Books quote it either way. This tool shows the plus form.
Why does a fractional price look unusual?
The tool shows the simplest fraction with a small denominator that matches the price. 1.91 becomes 10/11. An odd decimal such as 2.37 becomes a close fraction like 37/27.
Can I type a price with a comma or a dollar sign?
Type plain numbers: −110, 1.91 or 10/11. Spaces are ignored. For a probability, type the percentage, like 52.4.
Is this betting advice?
No. The tool is arithmetic on the numbers you type. EdgeFast is informational price discovery, not a sportsbook, and you decide whether to bet. 21+ only.
Related tools
Now check a real price.
Screenshot a betslip and EdgeFast compares your price with the listed sportsbooks and a fair market price.
Informational, not betting advice. 21+.