Reselling Profit Margins: How to Calculate What You Actually Earn
Plenty of resellers are busy but not as profitable as they think. The reason is almost always the same: they look at the money coming in and mistake it for profit. Understanding your true profit margin, what's left after every cost, is what separates a real business from an expensive hobby. This guide breaks down how to calculate what you actually earn.
Revenue is not profit
The most important distinction in reselling is between revenue and profit.
- Revenue is the total amount buyers pay you. It's the number that feels good.
- Profit is what remains after you subtract everything it cost you to make those sales.
Selling for a high total means little if your costs are almost as high. A reseller with modest revenue and tight costs can easily out-earn one with impressive revenue and sloppy costs. Profit, not revenue, is the number that pays you.
The costs you must account for
To find real profit, subtract every cost tied to a sale. It's easy to forget some of these, and each one you miss makes you look more profitable than you are:
- Cost of the item, what you paid to source it.
- Platform fees, selling fees, and any payment-processing charges the platform takes.
- Postage and packaging, the delivery cost you cover, plus mailers, boxes, tape and labels.
- Other costs, anything else that goes into the sale, such as cleaning or minor repairs, and travel to source stock.
Once all of these come out, what's left is your true profit on that item. Do this consistently and you'll quickly see which items genuinely earn and which just keep you busy.
Margin versus markup
These two terms get mixed up constantly, and confusing them leads to bad decisions.
- Markup is your profit expressed as a percentage of your cost. If an item cost you a certain amount and you add profit on top, the markup compares that profit to the cost.
- Margin is your profit expressed as a percentage of the selling price. It answers: of the money the buyer paid, what share did you keep?
The key point is that a big-sounding markup can hide a thin margin once fees and postage are included. Margin, calculated against the final selling price and after all costs, is the more honest measure of profitability. Focus on margin, not markup, when you judge whether a category is worth your time.
A simple worked approach
You don't need accounting software to get this right, you need a consistent method:
- Start with the sale price the buyer paid.
- Subtract platform fees.
- Subtract postage and packaging you covered.
- Subtract the cost you paid for the item.
- What's left is your profit. Divide it by the sale price for your margin percentage.
Applying this to every item turns vague optimism into real knowledge. It also feeds back into better sourcing and pricing, because you learn exactly what you need to pay and charge to hit a healthy margin.
Why tracking margin matters
Calculating one item's margin is easy. Doing it across dozens or hundreds of items, and spotting patterns, is where the real value lies:
- It reveals which brands and categories are actually worth sourcing.
- It shows whether your average margin is healthy or being eroded by fees and postage.
- It stops you from scaling a loss, because more sales at a poor margin just lose money faster.
Trying to hold all of this in your head, or in a sprawling spreadsheet, gets painful fast. A dedicated tool like Dancarly can Forecast an item's likely resale value before you buy and then track your real margin per item and overall, so you always know what you're genuinely earning. Master your margins, and every other reselling skill, sourcing, pricing, scaling, has a solid foundation to build on.