Erlang Calculator

The Erlang Calculator computes staffing and SLA-related metrics using classical queueing models. It supports Erlang-B for blocking probability and Erlang-C for waiting probability and service level implications. The tool converts arrival rate and handling time into offered traffic A in Erlangs, then applies the appropriate formula to estimate required agents and performance indicators. By encapsulating the math in a single calculation engine, analysts can rapidly compare scenarios, determine minimum headcount, and assess SLA feasibility. The core value lies in translating abstract traffic into actionable staffing recommendations while maintaining mathematical rigor and numerical stability. Users benefit from a transparent, model-based approach that supports what-if analyses, governance-ready outputs, and quick reporting for capacity-planning cycles.
The tool's unique value is its clear separation of models (B vs C) and its explicit handling of edge conditions (unstable queues or excessive blocking). Core features include input validation, automatic A computation from λ and HT, and outputs such as required_agents, occupancy, Pw (or P_block), ASA and service-level status. Use cases span contact-center hiring, telecom support centers, and any operation that relies on proven Erlang planning methods for staffing and SLA compliance.
Conceptually, users provide demand and performance targets, select the model, and receive a recommended workforce plus performance forecasts under the chosen scenario. This enables fast comparisons, cost-aware staffing decisions, and consistent reporting across teams and projects.