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Little’s Law Capacity

Relate stable throughput, time in system and work in progress.

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Local calculations. Results are estimates, not professional advice.

Average concurrent work

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Requires stable long-run averages and consistent system boundaries. This is not a maximum concurrency or queueing-tail guarantee.

Formula

L=λW

Relate stable throughput, time in system and work in progress.

Worked example

Average arrivals per second
100
Average time in system (seconds)
0.2
Average concurrent work
20

Scope and limitations

Requires stable long-run averages and consistent system boundaries. This is not a maximum concurrency or queueing-tail guarantee.

Inputs are checked for missing values and allowed ranges. A result outside the finite numeric range is not displayed. Rounding affects display, while the calculation uses the model’s numeric precision.

Check your units and assumptions before relying on a result. Changing a label does not convert a currency or physical unit.

Formula version: 8d0c6ed7f2d8 · Example checked:

Methodology

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