Size the system.
Then measure it.
A lightweight starting estimate for your hosting conversation. Real capacity depends on the application, not traffic alone.
01 / Your traffic
Start with a number.
Adjust the visitor count to explore the estimate. This calculation runs in your browser.
Enter a non-negative monthly visitor estimate, up to 1 billion.All developer tools02 / Starting estimate
Use this as a starting estimate, then measure actual PHP, database and cache usage under production load.
Measure the real workload.
This simple rule is not a load test or a hosting guarantee. Concurrent requests, plugins, uncached pages, checkout activity and background jobs can change the actual requirement substantially. Validate with your own production metrics.