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Common UX Metrics You Should Track

Metric	What It Measures	Why It Matters
Task Success Rate	How many users complete an intended action	Measures usability effectiveness
Time on Task	How long users take to complete a task	Identifies inefficiency or confusion
System Usability Scale (SUS)	User perception of ease of use	Standardized UX benchmarking
Net Promoter Score (NPS)	User loyalty and satisfaction	Predicts long-term retention
Error Rate	Number of failed attempts or mistakes	Highlights friction in design flow
Retention Rate	Percentage of users returning over time	Indicates product value and stickiness