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The price isn't what you keep: first subtract what it costs to deliver it

By the end, you'll know how to calculate, service by service, what you actually clear before overhead, and you'll have the real margin for at least three of your own.

By Yodai · Published September 6, 2026 · Updated October 12, 2026

Imagine you charge $40 for a haircut and $90 for a color. Which one should you push harder? If you answer by looking at the price, you're looking at the wrong number. The color brings in more, but it also costs more: product, mixing time, gloves. The haircut costs almost nothing. The question isn't how much you charge, it's how much you keep after paying for what it cost to do the job.

What you sell the most isn't always what earns you the most. This is the step that turns it into a number: the gross margin. Here's how you calculate it: selling price minus direct cost. Direct cost is only what you spend to deliver that specific service, not a dollar more. We're not factoring in rent, electricity, or your own time yet, that's coming in the next lesson. Today we're only subtracting what comes out of your pocket every time you sell it.

What counts as a direct cost and what doesn't

Direct cost is what disappears if you stop selling that specific service. At a hair salon: the color, the bleach, the gloves. At an online store: what the manufacturer charges you for the item, plus shipping if you're the one paying for it. At any business that takes card payments: the payment processor's fee, which takes a cut of every charge. How much depends on your provider, the card, and whether you're charging in person or online. Under Stripe's pricing for Spain, for example, an in-person charge with a Stripe reader costs 1.4% plus $0.10 if the card is from the European Economic Area, and 2.9% plus $0.10 if it's from outside it. Online, with a standard card from that region you pay 1.5% plus $0.25, and with a premium card, 2.8% plus $0.25. With cards from outside, the rate is different: 2.5% for UK cards and 3.15% for cards from the rest of the world, also plus $0.25, plus an extra 2% if the currency needs to be converted. That comes out of every sale, so it counts.

What doesn't count yet is your rent, your electric bill, the software you pay for every month, or the hours you put in yourself. Those costs exist whether or not you sell anything that day, or they're the same no matter which service you sell: they don't belong to that service, they belong to the whole business. Splitting them up comes later. The OpenStax managerial accounting textbook, from Rice University, calls a very similar calculation to the one in this lesson the contribution margin: the amount by which the selling price exceeds the variable cost per unit, which is what each sale contributes toward covering fixed costs, the ones that exist no matter the sales level. Each service has its own, and it's also expressed as a percentage of the price. With one difference: in businesses that run mostly on labor, that textbook counts labor as a variable cost. Here we leave it out on purpose, and your time gets counted separately. If you fold in the business's overhead now, you're mixing two different questions, and the number stops being useful for deciding anything.

Look at what this sample list shows: the haircut, which brings in less than the massage package, is the one with the highest margin percentage. Run it with your own numbers, and it's the real snapshot of your business. One service can fill up your calendar and leave you with little, while another can go almost unnoticed and still be the one you should push hardest. Without this calculation, you wouldn't know: you'd be deciding on a hunch.