The 80/20 Rule in Food Business Inventory
Counting everything weekly is why stocktakes get abandoned. The 80/20 rule — properly, ABC analysis — says most of your stock value sits in a small number of lines. Count those often and the rest rarely, and the whole thing becomes sustainable.
What the rule says
Roughly 80% of your inventory value sits in roughly 20% of your lines. In a bakery that is usually butter, chocolate, nuts, vanilla and specialist flours — while the other 80% of lines, the salt and baking powder and food colouring, hold very little value between them.
The practical consequence: counting everything at the same frequency spends most of your effort on the stock that matters least.
Doing the analysis
- List every ingredient with its unit cost and typical monthly usage.
- Multiply them: annual value = unit cost × annual usage. This is the number that matters, not price per kilo.
- Sort descending and take a running cumulative total.
- Class A is the top 70–80% of cumulative value, class B the next 15–20%, class C the remainder.
Note the second step carefully. Vanilla extract is expensive per litre but you use very little; strong flour is cheap per kilo but you use tonnes. Annual value, not unit price, decides the class.
What to do with each class
- Class A: count weekly, investigate any variance above a few percent, negotiate on price, watch supplier price history closely.
- Class B: count monthly, set par levels, review quarterly.
- Class C: do not count routinely. Set a generous par and reorder on sight. The cost of counting exceeds the value at risk.
This is also where supplier price tracking earns its keep: a 10% rise on a class A ingredient is a real margin event, and on a class C one it is noise. See spotting supplier price increases.
The trap
Classes are not permanent. Seasonal products move ingredients between classes — marzipan and dried fruit are class C in June and class A in November. Re-run the analysis at least twice a year, and before a known seasonal peak. Our guide to managing Christmas orders covers the seasonal version.
Frequently asked questions
What is the 80/20 rule in inventory? That most stock value concentrates in few lines, so counting effort should concentrate there too. Formally it is ABC analysis.
How often should a small kitchen do a full stocktake? A full count quarterly, with class A weekly, is sustainable for most small operations. Monthly full counts tend to get skipped by month three.