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Spare Parts Stock Cover Calculator

Estimate days of on-hand spare-parts coverage from a current stock quantity and positive average daily use. Formula: cover days = on-hand units / average daily use. This estimates depletion time and is not a reorder point or service-level calculation.

Example values are prefilled to demonstrate the calculation. Replace them with values for your product, package, equipment, and operating conditions.

Inputs

Stock and usage

Range: at least 0 whole units

Enter the non-negative whole count of available parts in the same inventory unit used for consumption. Exclude reserved or quarantined stock if it is not available to this asset.

Range: at least 0

Enter positive average consumption using either calendar days or operating days, consistent with the coverage interpretation. If measured per operating day, the result is operating days, not elapsed calendar days. Match the stock unit; zero use has no finite coverage estimate.

Result

Valid
Estimated stock cover (days on usage basis)
30.0 days
Coverage basis and exclusions
Coverage is a depletion estimate using the entered stock and average-use basis. If usage is measured per operating day, the result is operating days rather than calendar days. Reserved, quarantined, in-transit, substituted, or allocated parts and supplier lead time are excluded; this is not a reorder point or service-level calculation.

Calculation

Estimated stock cover (days on usage basis)
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