Complement probability

Statistics / FREE CALCULATOR

Find the probability that an event does not occur.

Enter your numbers

READY WHEN YOU ARE

Your answer starts here.

Enter your values and select Calculate to see the result and any available breakdown.

How to use this calculator

  1. Enter event probability. Use the unit shown beside the field.
  2. Select Calculate and review the result. Select Reset to restore the example inputs.

How the calculation works

1-Event probability

Worked example

Event probability = 0.3. Result: 0.7 probability.

Understand your result

Find the probability that an event does not occur. The result is expressed in probability.

Assumptions and limitations

Assumes the entered probability is valid for the event. Results are rounded for display.

Questions about this tool

What does this tool calculate?

Find the probability that an event does not occur.

What should I check before using the answer?

Assumes the entered probability is valid for the event.

Related guides

Guides will appear here when published and linked by the editor.