Most Used User Experience KPIs - Capicua

User Experience KPIs

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UX/UI

Updated: 2/18/25 •
Posted: 2/4/25

As Steve Jobs says, "Design isn't just how it looks like and feels like. Design is how it works."

Design is much more than art— it aims to solve user problems and provide value!

In this context, User Experience (UX) Key Performance Indicators (KPIs) allow businesses to measure UX efforts while identifying improvement opportunities.

Let's explore what UX KPIs are and how a business should measure them to ensure products that offer world-class UX!

What are User Experience KPIs?

According to the Interaction Design Foundation (IxDF), UX KPIs are quantifiable metrics that show how UX efforts perform.

These KPIs provide actionable insights for informed design decisions by removing personal biases and ensuring user-centered products.

Measuring and tracking UX KPIs is critical to meeting UX strategic business goals!

Types of User Experience KPIs

Behavioral KPIs

In UX Design, Behavioral KPIs are quantitative metrics used to understand user actions when interacting with a digital product.

Behavioral metrics help understand user behavior and uncover issues and areas for improvement.

1. Task Success Rate

Task Success Rate is the percentage of users who complete a task and the number of attempts they take.

This KPI is excellent for spotting usability issues and addressing them promptly. In average, an average completion rate below 75% could mean there are usability issues.

You can calculate Task Success Rate with this formula:

Task Success Rate = (Number of correctly completed tasks / Total number of attempts) * 100

2. Time on Task

Time On Task, or Task Time, represents the time it takes users to complete a specific task.

Low times reflect easy-to-use and intuitive interfaces, whereas long times show it's hard for users to understand how to use the product.

This is the formula to calculate Time On Task:

Average Time On Task = (Average Time Taken To Complete The Task / Total Number Of Users To Complete The Task)

3. User Error Rate

User Error Rate (UER) tracks the amount of mistakes users make when attempting to complete a task.

A high Error Rate is an indicator of usability issues.

You can calculate the User Error Rate KPI with the following formula:

User Error Rate = (Total Number of Errors / Total Number of Attempts) * 100

4. Error Occurrence Rate

The Error Occurrence Rate measures the frequency of a specific error among several possible ones.

This is the formula to calculate this rate:

Error Occurrence Rate = (Total Number of Errors for All Users / Total Number of Possible Errors for all Users) * 100

5. Navigation vs Search

The Navigation vs Search KPI shows the number of users who needed to use the search function to locate specific information.

A high amount of users relying on the search bars or other search methods may indicate that the product's navigation needs revision.

To calculate and present Navigation vs Search, use the following equation:

Navigation vs Search = (Number of Uses / Number of Total Interactions) * 100

Attitudinal KPIs

Attitudinal KPIs track user feedback on what they think and feel when interacting with a digital product.

These UX metrics focus on understanding how users perceive your product by analyzing their personal opinions.

1. System Usability Scale (SUS)

System Usability Scale is a standard method for measuring a product's usability through a 5-point Likert scale questionnaire.

The questionnaire includes a list of statements such as:

"I believe I will be able to use this product without the support of a technical person."
"I found the features and functions unnecessarily complex."

The formula to calculate SUS:

SUS = Total amount of points * 2.5

2. Net Promoter Score (NPS)

Net Promoter Score determines if users are likely to recommend your product on a scale of one to ten.

To measure, present and report NPS, you can follow this formula:

NPS = % promoters - % detractors

3. Customer Satisfaction Score (CSAT)

Customer Satisfaction Score measures how satisfied users are with your product.

By getting customer feedback through a scale of 1 to 5 you can understand their level of satisfaction with their product.

CSAT = (Number of Satisfied Users / Number of Participants) * 100

Conclusion

UX KPIs help teams gather actionable insights to align digital products with user needs, preferences and expectations.