Equal Error Rate Calculator


Calculating the Equal Error Rate (EER) is crucial in the field of biometrics and information security. EER represents the point where false acceptance rate (FAR) and false rejection rate (FRR) are equal, providing a comprehensive measure of a system’s accuracy. Building a simple calculator for EER allows users to quickly assess the performance of biometric authentication systems.

How to Use

To use the Equal Error Rate calculator, input the values for False Acceptance Rate (FAR) and False Rejection Rate (FRR) in the provided fields. Click the “Calculate” button, and the result will be displayed instantly.


The EER is calculated using the following formula:


  • FAR is the False Acceptance Rate.
  • FRR is the False Rejection Rate.

Example Solve

Suppose FAR=0.02 and FRR=0.15. Plugging these values into the formula:

The Equal Error Rate in this example is 8.5%.

Frequently Asked Questions

Q: What is the significance of EER in biometrics?

A: EER provides a balanced evaluation of biometric system performance, offering a compromise between FAR and FRR.

Q: Can EER be zero?

A: No, an EER of zero is theoretically impossible, as there will always be a trade-off between FAR and FRR.

Q: How can EER be used for system improvement?

A: Monitoring changes in EER over time helps identify improvements or deterioration in the accuracy of a biometric system.

Q: Is a lower EER always better?

A: Yes, a lower EER indicates a more accurate biometric system with reduced errors.


Creating an Equal Error Rate calculator facilitates quick assessments of biometric systems. By understanding the significance of EER and utilizing this tool, one can make informed decisions to enhance system accuracy.

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