Every business has a line. What's yours costing you?

A free, hands-on tool for understanding queues.
See why averages are misleading — and what to do about it.

Model
Coffee Shop
Open 6am-6pm. Morning rush peaks at 120/hr, slows in the afternoon. 6 baristas 8am-1pm, 4 rest of day.
Inputs
Arrivals
Service
Inter-arrival time
Service time
Distribution
Outputs
Wait (min)
Queue Length
Utilization
Avg
--
--
--
Peak
--
--
--
Max
--
--
--
Calculating...
Schedule & Simulation Settings

We build bespoke discrete event simulations for hospitals, clinics, manufacturers, and service operations, and contribute to tools. QueueSim is a free, hands-on simulator built on an ultra-fast Odin-based discrete event simulation engine — the same engine ChiAha uses on paid customer engagements.

Working on a healthcare problem? See QSimHealth. Want to talk through your own queueing challenge? Schedule a conversation.

Why lines form, why averages lie.

A plain-English guide to M/M/c, Little's Law, queue disciplines, and why simulation beats formulas. No PhD required.

Learn the theory →

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