Coming soon
FREE TOOLS

Days of supply calculator for stock

Estimate how long current units would last at a chosen daily sales average.

All retail calculators

Enter your figures, then calculate. Results use only these inputs and are not saved.

Formula and worked example

Units on hand ÷ average units sold per day.

Illustrative example: 84 units on hand ÷ 6 units a day = 14 days.

Before you use the result

  • Count usable stock in the location scope you are planning. Incoming orders are excluded unless you deliberately model a future position.
  • A zero daily average has no finite result. It may mean no demand, missing records or unavailable stock; investigate before making a buying decision.
  • The result assumes the average continues. It is not a forecast of promotions, seasonality, delivery dates or product expiry.

Related guides

The business workspace is coming soon. Join the headoffis waitlist for launch updates.