Turning inventory counts into a margin lesson

Count day has a reputation: clipboard, dust, and the strong suspicion that the number won’t match. Good. The mismatch is the lesson.

Here’s how to run a count that’s fast enough to happen monthly, and how to teach the gap it finds.

The count itself: small, regular, owned

Skip the heroic all-day annual count; it teaches dread. Count small and often instead:

• Cycle count weekly: one category per week (drinks this week, tees next), 15 minutes during a slow stretch.
• Full count monthly: everything, once a month, 45 minutes with the whole crew and music on.
• The inventory lead owns the schedule and the count sheet. Counters work in pairs: one counts, one writes, same discipline as the drawer.

Record three numbers per item: what the system says you have, what you counted, and the difference. The difference is called shrink, and it’s about to earn its keep.

The math that wakes a class up

Say the count finds 8 missing candy bars, a dented case you tossed, and 2 hoodies nobody can explain. Total cost of the missing goods: $40.

The reflex is “we lost $40.” The lesson is that it’s worse than that. Your store keeps maybe 40 cents of each sales dollar as gross profit (that’s the 40% margin from the pricing playbook). To earn back $40 of lost cost, the store has to sell:

$40 ÷ 0.40 = $100 of new sales

Put that on the board and watch it land: the two hoodies that walked off require a hundred dollars of hoodie-selling just to break even on the loss. Shrink turns into everyone’s problem, arithmetically, without a lecture.

Then close the loop in the ledger: shrink raises your real cost of goods sold, which lowers your real margin. A store that prices at 40% but shrinks 3% of inventory is actually running thinner than it thinks. Your CFO should present the “margin after shrink” number at the next huddle; it’s the most grown-up line in the whole deck.

Run your own count through it:

Investigate like operators, and grade the system

Where did the gap come from? Walk the usual suspects with the crew, most innocent first: counting errors (last count was wrong, this one’s right), receiving errors (the vendor shipped 46, the PO said 48, nobody counted the box), damage and expiry that never got logged, sales rung on the wrong item (the $2 chip bar keyed as the $1), and, last on the list on purpose, theft.

Notice that four of the five causes are process problems, and the fix is a tighter routine: count the box on receiving day, log damage the moment it happens, fix the lookalike-item confusion at the register. This is the blameless-but-accountable culture from the drawer count, applied to stuff instead of cash.

If a real theft pattern shows up, that’s an advisor conversation handled privately and seriously. The count’s job is to make the pattern visible early, when it’s small.

Make count day a monthly unit

One good monthly rhythm: count on the last Friday, CFO presents the shrink math at the following huddle (found $23 of shrink, that’s $57 of sales to cover; margin after shrink is 37.2%), crew picks ONE process fix for the month ahead, and next count grades the fix. That’s a full plan-do-check-act loop, run by teenagers, on real goods, every month.

By spring, your inventory lead can explain shrink, COGS, and margin erosion out loud, with their own store as the case study.

The one-page version

• Weekly cycle count (one category), monthly full count (everyone).
• Record expected, counted, difference. Pairs count; the lead owns the sheet.
• Teach the recovery math: shrink ÷ margin = sales needed to break even.
• Report “margin after shrink” at the huddle.
• Hunt process causes first; pick one fix per month; let the next count grade it.

The gap between the sheet and the shelf was always there. The count makes it visible, and visible means teachable.