How to use the Safety Stock Calculator
Enter the daily demand standard deviation and lead time and the result appears straight away. Everything runs in your browser, so nothing you type is uploaded.
The formula
Safety stock = 1.65 × daily demand standard deviation × √lead time in days.
Examples
- With the default values
Safety stock estimate: 19.8
- With daily demand standard deviation set to 8
Safety stock estimate: 39.6
Limitations and assumptions
Confirm assumptions, units and applicable local rules before relying on results. Detailed content, accessibility and edge-case review remains ongoing. Assumes independent daily demand and constant lead time; 1.65 is the approximate one-sided 95% service factor.
Frequently asked questions
What does the Safety Stock Calculator do?
Safety Stock Calculator for practical everyday workflows. Enter the requested values to get a clear result.
How does the Safety Stock Calculator work?
Enter the daily demand standard deviation and lead time and the result appears straight away. Everything runs in your browser, so nothing you type is uploaded.
What formula does the Safety Stock Calculator use?
Safety stock = 1.65 × daily demand standard deviation × √lead time in days.
What should I keep in mind when using the Safety Stock Calculator?
Confirm assumptions, units and applicable local rules before relying on results. Assumes independent daily demand and constant lead time; 1.65 is the approximate one-sided 95% service factor.
Can I see an example of the Safety Stock Calculator?
Daily demand standard deviation of 4 units and a 9-day lead time gives 19.8 units.
Is the Safety Stock Calculator free to use?
Yes. It is free, needs no account and runs in your browser.