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Load Testing Capacity Calculator

Concurrent users and average response time to required req/sec capacity - a quick napkin-math estimate for planning load tests.

ms

Required capacity

2,000.0 req/sec

Little's Law: concurrent users / average response time (sec)

Required requests/sec capacity2,000.0 req/sec
Total requests per session batch5,000 requests
Rough server count (@ ~100 req/sec/instance)~20 instances

The total-session figure (5,000 requests) is informational - it's the sum of all requests every concurrent user's session would generate, not a rate. The server-count line assumes a generic app server handles roughly 100 req/sec for a typical CRUD workload - this varies hugely by stack, payload size, and downstream calls, so treat it as a starting point for how many instances to put behind a load balancer, not a guarantee.

Rough estimate for planning only - always run actual load tests.

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