Work out concurrent session capacity instantly with clear inputs, formula shown and shareable results.
Session demand is users multiplied by concurrent sessions each, and per-user counts are far higher than intuition suggests: a modern browser opens dozens of parallel connections per page and background apps hold persistent sockets. Sixty per user is a realistic planning figure, and exceeding the device limit produces intermittent connection failures rather than a clean error.
Session demand
demand = users x sessions per user; required = demand x (1 + growth allowance)
Browsers open six or more connections per origin and a page loads assets from many origins. Add messaging, email sync, cloud storage and telemetry and 50 to 100 is normal.
Usually sessions, for user-facing traffic. Many small sessions exhaust state long before they saturate bandwidth, which is why both figures must be checked.