FeaturesDemand forecastingPurchase ordersFBA restockMulti-warehouseReorder alertsAI assistantAll features
IntegrationsAmazonShopifyeBayWooCommerceTikTok Shop (Coming soon)MintsoftLinnworksShipBobSlack & TeamsCSV importAll integrations
Who it's forMultichannel sellersAmazon sellersShopify brandsAgencies & 3PLsCompare
ResourcesGuidesGlossaryBlogFree calculatorsHelp centreDevelopersFree stockout report
Pricing
Log inStart free →

Home / Glossary / Days of cover

Replenishment

Days of cover

How many days current (or planned) stock will last at expected demand.

Definition

Days of cover (days of stock / days of inventory on hand) estimates how long sellable units will last at a chosen sales rate. Target days of cover after a PO arrives is a common buying rule.

Formula

Days of cover = sellable units ÷ average daily demand

Worked example

On hand 900 units, selling 30/day → 30 days of cover. If target after arrival is 60 and lead time is 20, you buy toward 60 days beyond arrival, not just “fill to MOQ”.

Why it matters for replenishment

Cover translates stock into time — the language buyers and finance share when debating cash vs service level.

How OmniRestock uses this

OmniRestock sizes replenishment suggestions toward a target days of cover after arrival (default 60), subject to MOQ and case pack.

Guides & calculators

Related terms

Common questions

Is days of cover the same as DOI?

Often used interchangeably for on-hand cover. Finance “days of inventory” can also mean a COGS-based turnover view.

What target cover should I use?

Long enough to cover lead time plus a buffer, short enough that cash and storage stay sane. Many teams use 45–90 days by category.

Does on-order stock count?

For planning cover through a horizon, yes — otherwise you double-buy.

Is days of cover the same everywhere?

The idea is shared, but formulas and marketplace rules differ. Use the definition on this page for ecommerce replenishment.

Do I need software to track days of cover?

A spreadsheet works for a few SKUs. Once you have many suppliers or channels, a replenishment tool keeps the numbers current.

Does OmniRestock change my live stock?

Not unless you switch Stock write or Purchase orders on for a connection. Drafts stay drafts until you confirm.

Explore more