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At Least One Success Probability

P(at least one) = 1−(1−p)^n.

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At least one event probability calculator online

P(at least one) = 1−(1−p)^n. Use this to check the stated relationship with your own numbers. The labels define the expected input order and units; the example provides a reproducible calculation.

How to use it

Enter exactly 2 comma-separated numbers in this order: single-trial probability, independent trials. Choose Calculate and review the result. Copy or download the output when it matches your requirements.

Calculation method

P(at least one) = 1−(1−p)^n.

Worked examples

Use this to check the stated relationship with your own numbers. The labels define the expected input order and units; the example provides a reproducible calculation.

Reproducible sample

Settings: No additional settings.

Input:

0.1, 10

With the settings above, the output is:

Output:

0.6513215599

Limitations and common mistakes

Use consistent units. This is a mathematical estimate; rounding and real-world conditions can change practical results.
Use the stated input order and consistent units. Decimal notation uses a dot; commas separate values. Results use floating-point arithmetic unless the tool explicitly says exact integer.

Frequently asked questions

How can I check the result?

Run the fixed worked example with the documented settings, compare its output, then check your own input format and units before copying a result.

Does this require an account?

No. This bundled tool runs in your browser without a conversion account.

How can I compute the probability of at least one success online?

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.