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Term

Cycle counting

Cycle counting is counting a portion of a warehouse's inventory every day, week or month until every item has been counted over a period, instead of shutting down for one wall-to-wall count. Fast or valuable items are counted more often. The US GAO says inventory record accuracy goals should be 95 percent or higher.

Also called cycle count, ABC cycle counting, perpetual inventory count, rolling stock count, inventory record accuracyUpdated 13 October 2026

Cycle count or wall-to-wall

Cycle countingWall-to-wall count
What is countedA portion of stock, daily, weekly or monthlyAll stock at one point in time
OperationsKeep runningUsually stop
Errors foundItem by item, through the yearAll at once, at the count
GAO-02-447G, Best practices in achieving consistent, accurate physical counts of inventory, March 2002

Inventory records drift. In 1999 the GAO reported that on-hand quantities in Defense Department inventories differed by 23 percent from the records; the Defense Logistics Agency's annual programme now counts 100 percent of the items in its custody every year. US tax rules require a physical inventory at reasonable intervals, and medicine distributors in the EU and Saudi Arabia must check stock against records regularly. The GAO guide sets cycle counting against wall-to-wall counting, in which the entire inventory is counted at a point in time.

Worked example: an ABC plan for 2,000 SKUs

ClassSKUsCounts a yearCounts
A — top 10%2004800
B — next 20%40031,200
C — next 30%60021,200
D — last 40%8001800
Total2,0004,000 — about 16 a day over 250 working days
Count frequencies from a GAO case study, applied to 2,000 SKUs

The mistake people make

Letting counters see the book quantity. GAO's review of Defense Department depots said counters should not have access to inventory records during the counts — a counter who knows the expected number tends to find it. Count blind, then reconcile, and let someone other than the counter post the adjustment.

FAQ

Cycle counting: common questions

What is the difference between cycle counting and a physical inventory?
A physical, wall-to-wall inventory counts everything at one point in time, usually with operations stopped. Cycle counting counts a portion at a time, daily, weekly or monthly, until the whole inventory has been covered.
What inventory accuracy should a warehouse aim for?
The US GAO says record accuracy goals should be 95 percent or higher. Many warehouses measure it by location as well as by item.
How often should A items be counted?
More often than the rest — four times a year in the GAO case study, against three for B items, two for C and one for D. The rule is to count what is fast or valuable most.

Sources

  1. Best practices in achieving consistent, accurate physical counts of inventory, GAO-02-447G — US Government Accountability Office, March 2002
  2. Major management challenges and program risks: Department of Defense, OCG-99-4 — US Government Accountability Office, January 1999
  3. DOD depot inventory records, AIMD-99-132 — US Government Accountability Office, June 1999
  4. Annual inventory program: refined focus on metrics — Defense Logistics Agency, 5 April 2019
  5. Publication 538, accounting periods and methods — IRS, January 2022
  6. Guidelines on Good Distribution Practice of medicinal products for human use, 2013/C 343/01 — EUR-Lex
  7. Good storage and distribution practices for drugs, version 1.2 — Saudi Food and Drug Authority

Related terms

On Traqo: Warehouse management system — where the book quantity a count checks against is kept.