1. What is Failure Rate?

Failure Rate (λ) is a measure of reliability that represents the frequency at which a component or system fails over time. It is expressed as the number of failures per unit time and is a key parameter in reliability engineering and maintenance planning.

2. How Does the Calculator Work?

The calculator uses the failure rate formula:

Where:

• \( \lambda \) — Failure rate (failures per unit time)
• Number of Failures — Total count of failures observed
• Total Time — Observation period in hours

Explanation: The formula calculates how frequently failures occur within a given time period, providing insight into system reliability and performance.

3. Importance of Failure Rate Calculation

Details: Failure rate calculation is essential for reliability analysis, maintenance scheduling, warranty planning, and quality control. It helps organizations predict equipment performance and plan preventive maintenance strategies.

4. Using the Calculator

Tips: Enter the total number of failures observed and the total observation time in hours. Both values must be positive numbers, with time greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What units are used for failure rate?
A: Failure rate is typically expressed in failures per hour, but can also be per day, month, or year depending on the application context.

Q2: How is failure rate different from MTBF?
A: Failure rate (λ) is the reciprocal of Mean Time Between Failures (MTBF). MTBF = 1/λ.

Q3: What is considered a good failure rate?
A: This depends on the industry and application. Critical systems require very low failure rates, while consumer products may tolerate higher rates.

Q4: Can failure rate change over time?
A: Yes, failure rates often follow a "bathtub curve" - high initially (infant mortality), then stable, then increasing as components age.

Q5: How can failure rate data be used?
A: For reliability predictions, maintenance planning, spare parts inventory, warranty analysis, and design improvements.