Software Testing Tools
Performance Test Load Calculator
Enter target RPS, response time, and think time to compute required virtual user count and select appropriate test type.
No data is transmitted — everything runs locallyTool
Example — Representative default scenario — target RPS 750 · duration min 20 · avg payload KB 12.
Virtual users needed
150
Little's Law: RPS × (response + think)
Target RPS
750
requests per second
Achieved throughput
750 RPS
at 150 VUs
k6 config
vus: 150, rate: 750
constant-arrival-rate scenario
About this tool
Performance Test Load Calculator
The Performance Test Load Calculator computes virtual user count, request rate, and test duration from RPS, response time, and think time parameters.
• Calculate virtual user count for a k6 or Locust load test configuration
• Convert from RPS target to virtual user count for a VU-based load testing tool
• Determine test duration for a soak test scenario
• Size a load test to reproduce a production traffic spike
Affiliate disclosure
Uptime, incident, and on-call management. Better Stack provides status pages, incident management, and on-call scheduling for engineering teams.
View performance tests with Better Stack
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FAQ
What does this tool tell you?
The Performance Test Load Calculator computes virtual user count, request rate, and test duration from RPS, response time, and think time parameters.
What affects the result most?
Load test: simulates expected traffic — verifies system handles normal load. Stress test: beyond expected load until failure — finds breaking point. Soak test: sustained load over hours/days — finds memory leaks and slow degradation.
How should I use the result?
The calculation is deterministic — the same inputs always produce the same output — so the most useful workflow is to vary one input at a time and see which factor moves the result most. That tells you where to focus your attention before committing to a decision.