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Statistics

Exponential Survival Probability Calculator

Find probability that a waiting time exceeds a given duration.

Data stays on this deviceConvention explained below

Data and assumptions

Runs on your device

STATISTICAL RESULT

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter event rate per time unit, waiting time.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

P(T > t) = exp(−rate × time).

A WORKED EXAMPLE

Using event rate per time unit = 0.5, waiting time = 2 time units, the result is 0.367879441 probability. Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

Constant-rate memoryless model. Rate and time units must correspond. A descriptive or probability calculation under the stated assumptions. Check the sample design and model before interpreting results.

Common questions

Which inputs does this calculation need?

Find probability that a waiting time exceeds a given duration. Enter event rate per time unit, waiting time in time units. The filled example is editable and is not a saved personal record.

How should I interpret the result?

Constant-rate memoryless model. Rate and time units must correspond. A descriptive or probability calculation under the stated assumptions. Check the sample design and model before interpreting results.

Methodology maintained by ClarityKit. How these tools are built and checked.