Enter arrivals, staff and service times. This free queue simulator runs every customer through your day, so you see the wait and the line hour by hour, and how many staff it takes to keep them short. No sign-up.
The simulator answers one line at a time. These go deeper on the ideas, try other kinds of systems, or put the engine inside your AI chat.
Utilization, Little's Law and M/M/c in plain English, each tied to a staffing call you have to make.
Read the queueing guideBarbershops, inventory, dispatch, machine breakdowns and more. Each one runs on the same simulation engine.
Browse the simulation modelsAdd QueueSim to Claude, Cursor or any MCP app. Ask a staffing question and the answer comes from a real simulation run. Free, no API key.
Add QueueSim to ClaudeOccasional product updates, new models and case studies.
Customers give up and leave. Some get served first. Staff take breaks, calls get transferred, and work moves through several stations. ChiAha builds custom simulation models for operations like that, on the same engine that runs QueueSim.
Staffing a clinic? QSimHealth is built for that, with labor cost included.