Reseller Profit Margin Calculator: Margin and Markup on a Resale
Work out the profit margin, markup, and gross profit on a resale item from your buy cost and sell price — the numbers that tell a reseller whether a flip is worth the effort and how to price the next one.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Profit margin | Markup | Profit |
|---|---|---|---|
| $18 cost · $45 price (60%) | 60.00% | 150.00% | $27.00 |
| $5 cost · $20 price (75%) | 75.00% | 300.00% | $15.00 |
| $60 cost · $90 price (33%) | 33.33% | 50.00% | $30.00 |
| $120 cost · $150 price (20%) | 20.00% | 25.00% | $30.00 |
How This Calculator Works
Enter your selling price and your cost of goods. The calculator returns gross profit in dollars, the margin as a percent of the selling price, and the markup as a percent of your cost. For a true picture, fold platform and shipping fees into your cost or subtract them from the price first.
The Formula
Profit Margin and Markup
Markup = (Revenue − Cost) / Cost × 100 — the same profit measured against cost instead of revenue
Worked Example
Buy an item for $18 and sell it for $45 and you make $27 gross profit — a 60% margin and a 150% markup. That sounds great until platform fees (often 10% to 15%), shipping, and your time come out of it. Resellers commonly aim for high markups precisely because fees and the occasional dud erode the headline number — a 150% markup can shrink to a thin real margin after a marketplace's cut and the cost of items that don't sell.
Key Insight
Reselling math is deceptive because the markup looks huge but the real margin is eaten by costs that don't show up in the buy price. Three things separate profitable resellers from hobbyists: counting all costs (platform fees, payment processing, shipping, supplies, returns) before celebrating the markup, pricing on the slow-moving inventory and duds that never sell (your winners have to cover them), and valuing your time — sourcing, listing, and shipping hours are real labor. A 60% margin on a single item is meaningless if you only sell a few a month; the business works when the margin holds across volume after every fee is counted.
Frequently Asked Questions
How is reseller profit margin calculated?
Gross profit is the selling price minus your cost; margin is gross profit divided by the selling price, times 100. Buy at $18, sell at $45, and you have $27 profit — a 60% margin and a 150% markup.
What's the difference between margin and markup?
Margin is profit as a percent of the selling price; markup is profit as a percent of your cost. The same $27 on an $18 cost is a 150% markup but only a 60% margin. Resellers often quote markup (it's bigger) but profitability is driven by margin.
Do platform and shipping fees count?
They should. Marketplace fees (often 10% to 15%), payment processing, shipping, and supplies all reduce your real profit. Either subtract them from the selling price or add them to your cost before reading the margin — otherwise the figure overstates what you actually keep.
What margin should a reseller target?
High — resellers often aim for markups of 100%+ (50%+ margins) because fees, returns, and unsold inventory erode the headline number. There's no universal target, but pricing thin leaves no room for the costs that inevitably appear, so build in cushion.
Why price for unsold items?
Because not everything sells. Some inventory sits, gets marked down, or never moves — and your profitable flips have to cover those losses. Pricing each item as if it'll definitely sell at full price ignores the duds, which is how resellers end up busy but not profitable.
Related Calculators
Methodology & Review
Gross profit is the selling price minus your cost; margin is gross profit as a percent of the price; markup is gross profit as a percent of cost. Cost should include the purchase price and direct acquisition costs; selling and platform fees that come out of the sale price are not separately modeled here.
Written by Ugo Candido · Last updated May 22, 2026.