A cycle count is an inventory check where you count a small part of your stock on a regular schedule, instead of counting everything at once. Each day or week you count a few SKUs or shelf locations, compare the result with what your system shows, and fix any difference. Over a set period every item gets counted, so records stay accurate without closing the warehouse for a full physical inventory.
This guide explains how cycle counting works, the main methods, how to run a count step by step, how to measure accuracy, and what changes when part of your stock sits in Amazon FBA or Walmart WFS.
Cycle count vs full physical inventory
| Cycle count | Full physical inventory | |
|---|---|---|
| What is counted | A small sample each time | Everything |
| How often | Daily or weekly, all year | Once or twice a year |
| Operations | Keep running | Usually paused |
| Errors found | Soon after they happen | Months later |
| Labor | Small and steady | Large, all at once |
Cycle counting methods
| Method | How it works | Best for |
|---|---|---|
| ABC analysis | Rank SKUs by value or sales. Count A items most often, B items less, C items least. | Most sellers |
| Control group | Count the same small group of SKUs repeatedly to find faults in your process. | Starting a counting program |
| Random sample | Pick SKUs or locations at random for each count. | Catalogs of similar items |
| By location | Work through the warehouse zone by zone or shelf by shelf. | Finding misplaced stock |
| Opportunity based | Count when something happens: a reorder, a stock level near zero, a picking error. | Adding to any other method |
ABC example
| Class | Typical share of SKUs | Typical share of sales value | Example count frequency |
|---|---|---|---|
| A | About 20% | About 80% | Monthly |
| B | About 30% | About 15% | Quarterly |
| C | About 50% | About 5% | Twice a year |
These splits are a common rule of thumb, not fixed numbers. Use your own sales data to set the classes.
How to do a cycle count, step by step
- Choose what to count today from your schedule: a list of SKUs or a set of locations.
- Finish open movements first. Put away received stock and complete open picks for those items, so the count is not taken mid-transaction.
- Count blind. The counter should not see the system quantity, so the count is not influenced by it.
- Record the count by SKU and location, ideally with a barcode scanner.
- Compare the count with the system quantity.
- Recount any difference before changing anything, preferably by a second person.
- Find the cause: a receiving error, a mis-pick, damage, theft, a return not put back, or units in the wrong location.
- Adjust the system and note the reason.
- Fix the process that caused the error, so it doesn’t repeat.
How to measure inventory accuracy
Inventory record accuracy = counts that matched ÷ total counts × 100
Example: you count 200 SKU locations in a month and 188 match the system. Accuracy is 188 ÷ 200 = 94%.
You can also measure the size of the errors:
Unit variance = (counted units − system units) ÷ system units × 100
Example: the system shows 150 units and you count 144. The variance is −4%.
How often should you cycle count?
- Often enough that every SKU is counted at least once in the period you choose, commonly a year, with best sellers counted far more often.
- More often for high-value items, fast movers, small items that are easy to lose, and any SKU with a recent error.
- A simple start: count a fixed number of locations every working day, for example 10 to 20, and adjust once you see your accuracy.
Common cycle counting mistakes
- Counting while stock is moving, with open picks or unprocessed receipts.
- Adjusting without a recount or without finding the cause.
- Counting only what is easy and skipping high shelves and overflow areas.
- Counting by product but not by location, which hides misplaced units.
- Stopping when things get busy, which is when most errors happen.
Cycle counting when you sell on marketplaces
- Your own warehouse or 3PL: you or your 3PL count the stock. Ask a 3PL how often it counts and how it reports differences.
- Amazon FBA and Walmart WFS: you cannot count the units yourself. Reconcile instead: compare what you shipped in, what sold, what was returned and what the marketplace says is on hand. Missing or damaged units can be claimed. See our Amazon FBA reimbursement guide and Walmart WFS reimbursement claim guide.
- Several channels on one stock pool: after a count, update the quantity once and push it to every channel, otherwise you oversell or create backorders.
Keep counts and listings in sync
A count only helps if the corrected number reaches every place you sell. Crazy Vendor’s warehouse management and inventory management hold stock per SKU and per location, and update Amazon, Walmart, eBay, Etsy and Shopify when a quantity changes. Reimbursements recovery flags lost and damaged FBA and WFS units, with no commission on recovered funds. Plans start at $29/month with a 21-day free trial. See pricing.
Related: warehouse stock control, how to calculate inventory turnover and what is a SKU.
Frequently asked questions
What is a cycle count?
It is counting a small part of your inventory on a regular schedule and correcting the records, so that all stock is checked over time without a full shutdown count.
What is the difference between a cycle count and a physical inventory?
A physical inventory counts everything at once, usually once or twice a year with operations paused. Cycle counting spreads the work across the year in small counts.
What is ABC cycle counting?
It is a method that ranks products by value or sales and counts the most important ones (A items) more often than the rest (B and C items).
What is a good inventory accuracy rate?
The closer to 100% the better. Many warehouses aim for the high nineties. Track your own number each month and work on the causes of the misses.
Do I still need a year-end inventory count if I cycle count?
That depends on your accountant and your reporting requirements. A reliable cycle counting program can reduce or replace the annual count in some businesses. Ask your accountant what applies to you.
Updated November 12, 2026.