Performance and capacity planning tools for QA, SRE and backend teams
Estimate RPS, concurrent users, throughput, load test volume, infrastructure sizing and observability conversions.
All tools
RPS calculator
Convert concurrent users into estimated RPS and back using response and think time.
Open toolAPI throughput calculator
Estimate safe and theoretical API throughput from latency and concurrency setup.
Open toolLoad test simulator
Simulate expected RPS, total requests and data volume for a test window.
Open toolInfrastructure sizing calculator
Estimate instance count with safety margin and optional redundancy.
Open toolObservability metrics converter
Convert ms, seconds, minutes, RPS, RPM and requests per hour.
Open toolLoad scenario generator
Generate starter scenario blocks for JMeter and k6.
Open toolWho this is for
QA engineers, SREs, backend developers and architects who need quick calculations for load, throughput, concurrency and capacity planning without setup overhead.
What you can calculate here
- Concurrent users to RPS and RPS to users conversion.
- Safe and theoretical API throughput from latency and workers.
- Load test request volume and approximate traffic data size.
- Instance count needed for expected production traffic.
- Observability time and throughput unit conversions.
- Initial scenario templates for JMeter and k6.
FAQ
What is RPS?
RPS means requests per second. It is a throughput unit often used to estimate API and service load.
How do concurrent users relate to throughput?
Each user creates requests over a cycle that includes response time and think time. Throughput grows with users and requests per flow.
How do I estimate API capacity?
Start with latency and effective concurrent execution slots. Divide total concurrency by latency in seconds for a rough upper bound.
How do I size instances for expected traffic?
Divide expected RPS by per-instance capacity, then add safety margin and optional redundancy to get recommended instance count.
Can I use these tools for JMeter or k6 planning?
Yes. The simulator and scenario generator were designed to bootstrap JMeter and k6 test plans quickly.