What if favorable exceeds total?
The calculator flags the result as invalid because favorable outcomes cannot exceed the total outcomes.
Step-by-step walkthrough
Probability Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- probability
- odds
- likelihood
Detailed procedure
Step 1
Enter the number of favorable outcomes.
Step 2
Enter the total possible outcomes in the sample space.
Step 3
See probability as a decimal, percentage, and odds in one glance.
Teaching & troubleshooting tips
Can I express probability as 1 in N?
Yes—the odds output presents the ratio so you can restate it as 1 in N or keep the colon notation.