EVERYDAY CLARITY
Equally Likely Outcomes Probability Calculator
Calculate event probability from a count of favorable and total equally likely outcomes.
Your result
Probability
Probability
%
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Favorable outcomes | Enter favorable outcomes using the definition in the method and example. |
| Equally likely outcomes | Enter equally likely outcomes using the definition in the method and example. |
Understanding your result
These outputs describe the probability model and event definitions you entered. A probability is a number from 0 to 1; a probability density is not itself the probability of one exact continuous value.
Common mistakes
- Entering 25 instead of 0.25 for a probability, or assuming events are independent when the model requires that assumption.
- Confusing an exact-count probability with a cumulative probability, or replacement with sampling without replacement.
Check your calculation
- Check a zero/certain-event boundary and the stated support of the distribution against the worked example.
Calculation checks, sources and review limits
What is the chance of a favorable result among equally likely outcomes?
Calculate event probability from a count of favorable and total equally likely outcomes.
Common uses
- What is the chance of a favorable result among equally likely outcomes
How it works
probability = favorable / total; percent = probability * 100
Worked example
Enter Favorable outcomes: 2 ; Equally likely outcomes: 8 . Results: Probability: 0.25 ; Probability: 25 %.