The biggest fear in running a coffee shop is selling a cup that does not make money. The bulk of the cost of espresso actually lies not in the milk, but in the consumption of coffee beans. Once you work out the cost per gram clearly, both bean selection and pricing become grounded in data.

Start with the most basic calculation. The dose for a standard double espresso usually falls between sixteen and twenty grams, so take a common eighteen grams. A kilogram of coffee beans is about 1000 g, and at eighteen grams per shot, the theoretical yield is around 55 cups; once you factor in residue left in the grinder burrs and the purge loss when switching beans, the actual usable amount drops by roughly ten percent, landing at around 50 cups, which is a normal level. In other words, the price of a kilogram of beans divided by the actual number of cups yields the bean cost per cup. Put that figure together with the selling price and the milk cost, and the gross margin on a milk coffee becomes immediately clear.

Dose is the key variable affecting cost. With the same beans, dropping the dose from eighteen grams to sixteen grams can raise the yield per kilogram from around 50 cups to around 60 cups, clearly lowering the cost per cup. But you cannot lower the dose just because you want to; too small a dose leads to under-extraction, thin flavor and sparse crema, so the customer tastes something watery, which instead damages your reputation. So the smarter approach is not to push the dose down, but to choose a bean with enough flavor concentration. A 100% Arabica espresso blend like Black Cocoa Blend has abundant crema and a full-bodied mouthfeel, and its flavor can fill a whole latte at a standard dose, with no need to increase the dose to make up for taste, so the cost stays naturally controllable.

Losses must also be counted. Dialing in, steaming milk and cleaning the group head all consume some beans and coffee liquid every day. If you settle these hidden losses daily and total them once a week, you will find that actual bean consumption is often higher than the theoretical value. The way to control loss is straightforward: grind small amounts more often, empty the hopper before closing, and calibrate the grinder regularly, so that every gram of beans goes into a cup.

When choosing beans, you can prepare both a cost-first blend and a flavor-first blend, and use them in combination according to your menu positioning. Write down the three data points of cost per gram, cup yield and loss, and look back a month later: which beans make money and which drink should be repriced will all be perfectly clear.