01
Use one coverage formula
Divide saleable on-hand units by average or forecast weekly unit sales for the same SKU.
InventoryFREE · NO SIGNUP
Weeks of Supply Calculator
Turn saleable stock and weekly unit sales into a clear coverage horizon without turning the estimate into a reorder promise.
FREE TO USEA LOOK ATLAS TOOL
01 USE IT NOW02 NO ACCOUNT03 FIELD NOTES BELOW
WORKING INPUTS
Match stock with one weekly demand rate.
LIVE RESULT
Weeks of supply
5.0 weeksConstant-rate coverage estimate before receipts, transfers, returns, cancellations, or stock adjustments.DAYS OF SUPPLY35.0 days
SALEABLE STOCK250 units
WEEKLY SALES RATE50 units / week
RATE ASSUMPTIONConstant
14
ONE CLEAR OPERATING SIGNAL
Use one coverage formula
Divide saleable on-hand units by the average or forecast weekly unit sales for the same SKU and scope.
WORKING VIEW
5.0 WEEKS250 UNITS · 50 PER WEEK
METHODsaleable units on hand ÷ average weekly unit sales
WORKING NOTE35.0 days of modeled supply
INPUTS → CLEAR OUTPUT
THE FIELD NOTES
Quick answer above. Better decisions below.
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
250 UNITS · 50 PER WEEK5.0 WEEKS
35.0 days of modeled supply
02
Choose the demand rate deliberately
Trailing sales can understate demand after stockouts or overstate it after a promotion.
03
Treat coverage as a scenario
The horizon assumes the entered weekly rate remains constant and inventory changes only through those sales.
04
Do not turn coverage into a reorder promise
Weeks of supply does not include lead time, safety stock, minimum order quantities, or supplier reliability.
THE PRODUCT IS NEXT
Turn the product into the campaign.
Use Look Atlas to transform one straightforward product photo into premium on-model ecommerce imagery for your store, ads, and social channels.TRY YOUR FIRST SHOOT FREENO CREDIT CARD REQUIRED
Use one coverage formula
Divide saleable on-hand units by average or forecast weekly unit sales for the same SKU.
Multiply weeks by seven for the equivalent days-of-supply view.
Choose the demand rate deliberately
Trailing sales can understate demand after stockouts or overstate it after a promotion.
Use a forecast when seasonality or planned activity makes the recent average unrepresentative.
Treat coverage as a scenario
The horizon assumes the entered weekly rate remains constant and inventory changes only through those sales.
Receipts, transfers, cancellations, returns, and stock adjustments can change the actual runway.
Do not turn coverage into a reorder promise
Weeks of supply does not include lead time, safety stock, minimum order quantities, or supplier reliability.
Use it alongside reorder-point and safety-stock analysis rather than as a replacement.
Questions, answered.
How do I calculate weeks of supply?
Divide saleable units on hand by average or forecast weekly unit sales for the same SKU and measurement scope.
What happens when weekly sales are zero?
The tool shows that no finite coverage rate can be calculated instead of displaying infinity or inventing a stockout date.
Is the coverage horizon guaranteed?
No. It assumes a constant weekly sales rate and no receipts, transfers, returns, cancellations, or stock adjustments.
BUILT BY LOOK ATLAS
Your product deserves more than a marketplace thumbnail.
Turn a simple product photo into polished, campaign-ready creative for your store, ads, and social channels. No studio. No reshoots.
Create your first shoot free, then keep going when you’re ready.
01 PRODUCT PHOTO → CAMPAIGN