Probability Calculator
Calculate the probability of an event as a percentage and odds.
Result
Results are estimates for general information only and are not professional advice.
Probability
Probability measures how likely an event is, from 0 (impossible) to 1 (certain). It equals favorable outcomes divided by total outcomes. This calculator shows the result as a fraction, decimal, percentage and odds.
Frequently Asked Questions
What is the Probability Calculator?
Calculate the probability of an event as a percentage and odds. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the Probability Calculator?
The Probability Calculator asks for the following values (2): Favorable outcomes, Total outcomes. Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Probability Calculator?
The Probability Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Probability Calculator free, and do I need an account?
Yes. The Probability Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.