Probability Calculator

The Trencada Probability Calculator solves common probability problems in seconds. Choose single-event probability, combined A and B, either A or B, at-least-once, combinations (nCr) or binomial probability — with step-by-step results. Everything runs in your browser — free, no signup. HOW TO USE: 1. Pick a mode. 2. Enter the numbers. 3. Press Calculate. KEY FEATURES: 6 probability modes; combinations and binomial; step-by-step working; percent and odds output; mobile friendly; 100 percent private.

Frequently Asked Questions (FAQ)

What does the probability calculator do?

Choose a calculation mode and enter your values. It computes the probability of the event as a percentage, fraction and decimal.

What calculation modes are available?

Modes cover single events, multiple events, and combinations — pick the one matching the problem you are solving.

How is probability expressed?

Results show as a percentage, a simplified fraction and a decimal, so you can use whichever form your work needs.

Can it handle and/or scenarios?

Yes. Select the mode for combined events to calculate the chance of A and B, or A or B, occurring.

Is the probability calculator free?

Yes. It is free to use with no signup and no limits.