Mean Time To Failure Calculator

Mean Time To Failure (MTTF) Calculator can be used to estimate the average time between failures of a system or component based on failure rate data.

Input Parameters

Enter the average number of failures per hour

Average hours the system operates per day

Average days the system operates per month

Calculation Results

Calculation Formula

MTTF = 1 / λ (hours)

Where:
λ (lambda) = Failure Rate per hour
MTTF = Mean Time To Failure

-- hours
-- hours
-- hours

Mean Time To Failure Calculator Usage Guide

Learn how to use the Mean Time To Failure Calculator and understand MTTF calculation principles

What is Mean Time To Failure (MTTF)?

MTTF is a statistical measure that represents the average time a system is expected to operate before failing. It's commonly used in reliability engineering to predict system lifespan based on failure rate data.

How to Use This Calculator

  1. Enter the Failure Rate (λ) in failures per hour. This is typically provided by equipment manufacturers or obtained through historical data.
  2. Set the Average Operating Hours per Day based on how many hours your system typically runs daily.
  3. Set the Average Operating Days per Month based on your operating schedule.
  4. Click the Calculate button to compute the MTTF values.

Understanding the Results

The calculator provides three results:

  • MTTF (hours): The average time between failures in hours
  • MTTF (Monthly): The expected time between failures in a month
  • MTTF (Daily): The expected time between failures in a day

Example

If a system has a failure rate of 0.0002 failures per hour:

MTTF = 1 / 0.0002 = 5000 hours

With operating hours of 24 per day and 30 days per month:

Monthly MTTF = 5000 × 24 × 30 = 3,600,000 hours

Applications

MTTF calculations are useful for:

  • Reliability engineering and design
  • Preventive maintenance planning
  • System lifecycle cost analysis
  • Comparing reliability between different systems