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Safety stock calculator

July 6, 2026

Discover Flowlity's free interactive safety stock calculator: move the sliders and watch, in real time, how your target service level, demand variability and lead time shape the buffer you carry, and why the last points of service cost the most.

Safety stock calculator

How much buffer each extra point of service really costs, and why the last points cost the most.

Target service level95.0%

Demand variability σ (units / week)

Lead time (weeks)

Extra stock for +1 pt of service

-units

Safety stock at target

-units

Service factor Z at this setting: -

Illustrative, textbook safety stock formula on a normal demand assumption. Not a Flowlity output or a performance guarantee.

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