The Short Answer
You can’t improve what you don’t measure. UX metrics turn subjective opinions into objective data.
Here are the 10 metrics every UX designer should track, why they matter, and how to measure them.
1. Task Success Rate
What it measures: Percentage of users who complete a task successfully.
How to measure: Usability testing — watch users try specific tasks.
Benchmark: 80%+ for well-designed products. Below 60% = major issues.
2. Time on Task
What it measures: How long it takes users to complete a task.
How to measure: Track in usability testing or analytics.
Benchmark: Compare against your own baselines. Focus on trends, not absolutes.
3. Error Rate
What it measures: How often users make mistakes.
How to measure: Track form errors, wrong clicks, backtracking in analytics.
Benchmark: Below 5% for simple tasks. Below 10% for complex flows.
4. System Usability Scale (SUS)
What it measures: Overall usability (10-question survey, 0-100 score).
How to measure: SUS survey after completing key tasks.
Benchmark: 68+ is above average. 80+ is excellent.
5. Net Promoter Score (NPS)
What it measures: How likely users are to recommend your product.
How to measure: “How likely are you to recommend us? (0-10)”
Benchmark: 50+ is excellent. 0-30 is poor.
6. Customer Satisfaction (CSAT)
What it measures: How satisfied users are with a specific experience.
How to measure: “How satisfied were you? (1-5 stars)”
Benchmark: 4.0+ is good. Track trends over time.
7. First Click Success
What it measures: Whether users click the right thing first.
How to measure: Usability testing — record first clicks on task start.
Benchmark: 85%+ is strong. Below 50% = navigation issues.
8. Bounce Rate
What it measures: Percentage of users who leave after one page.
How to measure: Google Analytics.
Benchmark: Varies by page type. Blog: 40-60%. Landing page: 30-50%.
9. Conversion Rate
What it measures: Percentage of users completing a goal.
How to measure: Analytics — track goal completions.
Benchmark: Varies by industry. E-commerce: 2-3%. SaaS: 5-10%.
10. Retention Rate
What it measures: Percentage of users who come back.
How to measure: Analytics — track return visitors.
Benchmark: SaaS: 40%+ monthly. E-commerce: 30%+ repeat buyers.
How to Track These Metrics
Free Tools
- Google Analytics — Bounce rate, conversion rate, retention
- Maze — Task success, time on task, first click
- Hotjar — Heatmaps, user recordings
- Typeform — SUS, NPS, CSAT surveys
- WebAIM — Accessibility scores
What to Track First
Start with 3-5 metrics. Don’t track everything at once.
- Task Success Rate — Do users complete tasks?
- SUS Score — Is the product usable overall?
- Error Rate — Where do users struggle?
Add more as you establish baselines.
The Bottom Line
UX metrics aren’t about numbers. They’re about evidence. Let data tell you what works, what doesn’t, and where to focus. Track 3-5 metrics to start. Measure consistently. Improve continuously.