Free Odds Converter
Convert between probability, decimal odds and fractional odds.
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Inputs
Result
Decimal odds
4.000
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Short answer
Convert between probability, decimal odds and fractional odds.
What is the Odds Converter?
Convert between probability, decimal odds and fractional odds.
How does the Odds Converter work?
Enter the inputs above and read the result.
Formula
Variables
pProbability of the event happening
Explanation
Decimal, fractional and American odds are three common ways bookmakers express the same underlying probability.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Odds Converter sits inside the Unit Conversion Tools hub, in the data & numeric systems cluster. Digital storage and number representation. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Odds
Convert between probability, decimal odds and fractional odds. Within unit conversion tools, odds belongs to the data & numeric systems cluster, where it shares terminology and assumptions with closely related tools.
Learning how odds is calculated
Decimal, fractional and American odds are three common ways bookmakers express the same underlying probability. Working through the variables one at a time — p — makes the result reproducible by hand and easier to sanity-check.
Using odds to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How odds compares with related measures
byte, binary prefix, radix, notation all describe adjacent aspects of data & numeric systems. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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