Inventory & Stock Calculator
Stock value, days of cover and reorder point.
Days of stock left33 days
Inventory value$5,400
Reorder when stock reaches378
Units to order now (30-day cover)318
Get a Free Review of These NumbersHow it works
Enter your numbers and the results update instantly. Fields marked * are required; the rest can stay at zero. Nothing you type is saved or sent anywhere.
Formula
Days of stock left = stock / daily_sales
Inventory value = stock * unit_cost
Reorder when stock reaches = ceil(daily_sales * (lead_time + safety_days))
Units to order now (30-day cover) = max(0, ceil(daily_sales * (lead_time + safety_days + 30) - stock))
Tips: what your result means
- Re-run the numbers whenever your price, courier rate, fees or offer changes.
- If your margin is under 10%, small changes in ad cost or returns can wipe out profit.
- Use the related calculators below to check break-even ROAS and pricing together.
Frequently asked questions
Is this inventory & stock calculator free?
Yes. Every tool on this site is free to use with no sign-up.
Which currency does it use?
It picks your currency from the country you visit from. You can switch between USD, BDT, EUR and GBP.
How accurate is the result?
The maths is exact for the numbers you enter. Accuracy depends on using real costs from your store and ad account.
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