// multi-utility computation suite · offline · instant · precise
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fin.reorder-point-lead-time Calculator
Calculates the reorder point (ROP = average demand during lead time + safety stock) and safety stock from demand variability. Setting the reorder point too low causes stockouts; too high causes excess inventory — safety stock is calibrated to the desired service level (e.g., 95%).
Inputs
Avg Daily Demand
Age in completed years. Many health and fitness formulas adjust for age.
Lead Time Days
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Demand Std Daily
Reference formula or conversion factor shown for context.
Service Level Pct
Reference formula or conversion factor shown for context.
Results
reorder point (units)
Sample size or count used in the calculation.
safety stock (units)
Sample size or count used in the calculation.
average demand during LT
The arithmetic mean -- sum divided by count.
z-score at
Number of standard deviations a value is from the mean. |z| below 2: within normal range. |z| above 2: in the outer 5% of the distribution. |z| above 3: in the outer 0.3%.
ROP = d×LT + z×σ×√LT
Reference formula or conversion factor shown for context.
service level
The measured or computed level on the applicable scale.