basic

Safety Stock from Demand Variability and Lead Time Calculator

Buffer stock to prevent stockouts during demand spikes.

Calculates safety stock = z × σ_demand × √LT, where z is the service-level z-score (e.g., 1.65 for 95%), σ_demand is the daily demand standard deviation, and LT is lead time in days.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

units
days

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

SS = z · σ_d · √LT

In depth

Calculates safety stock = z × σ_demand × √LT, where z is the service-level z-score (e.g., 1.65 for 95%), σ_demand is the daily demand standard deviation, and LT is lead time in days.