Convenience store margin math: markup, case cost and shelf price

Convenience store margin math starts with one distinction

Markup and margin are both profit divided by something, and the something is different. Markup divides profit by what you paid; margin divides it by what the customer paid. Because the selling price is the larger denominator, margin is always the smaller percentage, and a supplier or spreadsheet quoting one when you assumed the other has quietly moved your numbers.

Take an illustrative item costing $1.00 that you sell for $1.50. The profit is $0.50. Markup is $0.50 divided by $1.00, which is 50 percent. Margin is $0.50 divided by $1.50, which is 33.3 percent. Same item, same fifty cents, two very different-sounding percentages. A store that believes it is running 50 percent margins on that item is running 33.

Two formulas are worth taping inside a cupboard door. To go from cost to price at a target margin, divide the cost by one minus the margin: $1.00 at a 35 percent target is 1.00 divided by 0.65, or $1.54. To find the margin you are getting, subtract cost from price and divide by price.

From case cost to unit cost without fooling yourself

A case price is not a cost of goods until you divide it by the number of units you will actually sell out of that case. Three things break that division in practice, and all three make the real unit cost higher than the arithmetic suggests.

First, confirm the count rather than assume it: pack configurations change between suppliers and sometimes between runs, so divide by the count on the invoice, not the one you remember. Second, decide what your selling unit is, singles out of a 24-count case means a unit of one, and comparing a single price against a four-pack price compares two different products.

Third, allow for what you will not sell. Damage, short-dated stock, the flavor in the variety case nobody buys and theft all reduce the units a case produces revenue from. Count what you write off in a month, divide it by what you bought, and carry that as a percentage.

Worked illustratively: a case at $24.00 containing 24 units is $1.00 a unit on paper. If you consistently lose about one unit in twenty to damage, date and shrink, you are really getting 22.8 saleable units, and the unit cost is $24.00 divided by 22.8, which is $1.05. At a $1.50 shelf price that is the difference between a 33.3 percent margin and a 30.0 percent one.

Landed cost: delivery, pickup and the cost of going to get it

Landed cost is the case price plus everything you spend to have it sitting in your back room: delivery charges, and the cost of your own time and vehicle if you collect.

Gokul offers free warehouse pickup in Itasca and same-week delivery across Chicagoland, so for most stores the comparison is your own two hours against a delivery slot.

Tobacco is the one category where the landed-cost calculation has an extra rule, and getting it wrong is expensive in both directions. Tobacco pricing from Gokul is tax-inclusive, which means the applicable tobacco tax is already inside the quoted price, treat that number as your landed cost. For cigarettes the mechanism is the stamp: a licensed distributor prepays the Illinois cigarette tax by buying stamps and collects it from the retailer at or before sale. For tobacco products other than cigarettes it is the Tobacco Products Tax, for which the distributor is liable and which Illinois law permits the distributor to pass on in the price. In neither case do you add the excise again when setting the shelf price.

Your own retail sales tax at the register is separate and does not change landed cost, though it does change the shelf price customers see: soft drinks and candy are taxed at the Illinois high rate rather than the grocery rate, so a drink and a bottle of plain water carry different tax at your checkout.

Pricing a 20 oz drink and a pack of cigarettes

These two items behave completely differently and it is worth seeing why side by side. The table uses illustrative round figures; it is not a quote and not a claim about what any product costs.

The drink is the flexible one: you set the shelf price, the competitive range is wide, and the cost base is the case divided by the count. The pack is constrained, most of its landed cost is tax settled before you saw the case, the price is highly visible, and the room to move is small. That is why margin percentage is a poor way to judge tobacco and gross profit dollars per week is the number to watch.

So manage the two with different questions, and settle them with your own numbers rather than with received wisdom. For the drink, ask what the shelf will bear and whether the margin justifies the cooler door. For the pack, run four weeks of units, gross profit dollars and basket attach rate before you decide what the category is really doing for you.

Turns, and why a good margin can still be a bad item

Margin percentage says nothing about time. An item at 55 percent margin that sells twice a month earns less than one at 25 percent that sells forty times, and the second converts your money back into cash you can spend again.

The measure worth keeping is simple enough for paper: gross profit dollars per facing per week. Take gross profit per unit, multiply by weekly units, divide by facings. Run it for every item competing for the same cooler door and the ranking is usually obvious and frequently surprising.

Turns also decide how much cash the shelf holds. A slow item at a high margin ties up money that does nothing until it sells, and on a short-dated product that money risks becoming a write-off. You do not need a system for this: pick the ten items you have least confidence in, count them for four weeks, and calculate gross profit per facing per week for each.

When a deal case loses money on space

A deal that lowers your unit cost is only a deal if you sell the units. The usual failure runs in three stages: a bigger case buys a lower unit cost, the extra units sit, and the shelf space stops earning what it used to. On a short-dated product a fourth stage follows, writing the remainder off.

Before you take a deal case, do the arithmetic in the other direction, and do it on your post-order position rather than on the case alone. Add sellable on-hand units to the inbound units, divide by weekly unit sales, and you have the weeks of supply you will actually be carrying. If that number is longer than the remaining date life on the stock, the deal is a write-off with a discount attached. If it is longer than the season, it is next year problem sitting in your back room today.

Then price the space. If a deal case needs two facings for six weeks in a spot that earns a known gross profit per facing per week, the deal has to beat that figure, not merely the regular case price. That is why a store can chase every promotion and still lose ground: each deal looked good against its own list price and bad against the alternative use of the shelf.

The cases worth taking are where the item is already a proven mover at your store, the weeks of supply sit comfortably inside the shelf life, and the back room can hold the overflow without giving up selling space. Those three checks filter out most of the offers that become write-offs.