Probability is a measure of the likelihood that an event will occur, expressed as a fraction, decimal, or percentage.

How do I calculate probability?

Probability is calculated by dividing the number of favorable outcomes by the total number of possible outcomes.

Can I calculate probability as a percentage?

Yes, the Probability Calculator shows probability both as a decimal and as a percentage.

Is this calculator free?

Yes, CalHub's Probability Calculator is completely free to use.

Does CalHub store my data?

No, all calculations happen locally in your browser and no data is stored.

Probability Calculator

Calculate probability easily by entering favorable outcomes and total outcomes.

Favorable Outcomes

Total Outcomes

Probability

0.00

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What is Probability?

Probability is the measure of how likely an event is to occur. It ranges from 0 (impossible) to 1 (certain) and can also be expressed as a percentage.

How to Use CalHub Probability Calculator

Enter the number of favorable outcomes.
Enter the total number of possible outcomes.
Click “Calculate Probability” to see the result.

Frequently Asked Questions

A favorable outcome is the specific result you are trying to achieve.

No, probability is always between 0 and 1.

Yes, the result is shown both as a decimal and as a percentage.

Yes, CalHub's Probability Calculator is free to use.

No, all calculations happen locally in your browser.