Reseller Profit Calculator (2026): Your Real Profit on Poshmark, Depop, Mercari & eBay

One calculator for all four big resale platforms. Enter your numbers once and see the platform fee, net profit, margin and ROI side by side — so you know the real money before you list.

Listing an item is easy. Knowing what you actually keep is the part most resellers guess at. Every platform skims a different cut, charges it on a different base, and structures it differently below or above a threshold. The result: the same $40 item can hand you very different take-home pay depending on where you sell it. This page gives you a free, accurate reseller profit calculator that runs the 2026 fee math for Poshmark, Depop, Mercari and eBay, then explains exactly how the numbers work so you can price every listing on purpose.

Multi-platform profit calculator

Pick a platform, type in your numbers, and the results update instantly. Switch the dropdown to compare the same item across marketplaces.

The profit formula every reseller should memorize

Underneath every platform's fee structure is the same simple equation. Once you internalize it, no marketplace can surprise you:

Net profit = (item price + shipping you charge) − platform fee − (sourcing cost + other cost)

Two ratios turn that dollar figure into a decision:

• Margin = net profit ÷ revenue. Revenue is your price plus the shipping you collect. Margin tells you how much of each sale stays in your pocket. A $10 profit on a $40 sale is a 25% margin.
• ROI = net profit ÷ (sourcing + other cost). This measures how hard your buying budget works. That same $10 profit on a $10 cost basis is a 100% ROI — you doubled your money.

"Other cost" is your catch-all: the polybag, the tissue paper, the gas to the thrift store amortized per item, the dry cleaning. Resellers who skip it consistently overstate their profit by a dollar or two per sale, which adds up fast across hundreds of listings.

How each platform's fee actually works

The differences are not cosmetic — they change which platform wins at different price points. Here is the 2026 picture:

Depop also offers an optional Boost that adds 12% to promote a listing. The calculator above models the standard, non-boosted fee.

Three things to notice. First, Poshmark's fee is based on the sale price only and includes the label, so shipping does not feed the fee — that is why the calculator hides shipping for Poshmark. Second, everyone else charges on item plus shipping, so padding your shipping charge does not escape the fee. Third, Poshmark is unusual: dirt cheap on tiny items ($2.95) but expensive once you cross $15, where a flat 20% kicks in. Want the platform-by-platform detail? See our deep dives on Poshmark fees, Depop fees and Mercari fees.

The same $40 item across all four platforms

Let's make it concrete. You sell an item for $40, you charge the buyer $0 shipping (built into the price), it cost you $8 to source, and $2 in supplies. Here is the take-home on each marketplace:

Same item, same cost, and the spread between the best and worst platform is $6.23 per sale. On Depop you keep $28.23; on Poshmark, $22.00. Across 200 sales a year, choosing the right venue for this price point is over a thousand dollars of pure profit — money you would never see in the listing flow itself, because the fee is silently deducted at payout.

Notice that Depop's percentage looks tiny but it carries a fixed $0.45, and eBay carries $0.40. Those flat fees barely matter at $40 but dominate at low prices. That is the whole game: at $8, Poshmark's $2.95 flat fee actually beats eBay's 13.35% + $0.40. There is no single "cheapest platform" — only the cheapest platform for this price. That is exactly what the calculator is for.

ROI vs margin: which one should you chase?

This is where flippers and brand-builders part ways, and both are right for their goals.

If you are a flipper — buy low, sell fast, recycle the cash — ROI is your north star. A $5 item you flip for $20 net might be "only" a $15 profit, but that is a 300% ROI on a tiny cash outlay you can repeat ten times over. Volume times ROI is how flippers compound a small bankroll into a real business.

If you are building toward steady income on bigger-ticket items, margin matters more. A 60% margin means you can absorb a return, a discount, or a slow month without going underwater. Low-margin, high-price items are fragile: one return wipes out the profit on the next two sales.

The calculator shows both lines on purpose. Glance at ROI to decide whether an item is worth sourcing at all; glance at margin to decide whether the listing price is healthy.

Price backward from your target margin

Most resellers price forward: they pick a price that "feels right," list it, and discover their real margin at payout. Reverse the process. Decide the margin you want first, then work out the price that delivers it after fees.

Say you want a 50% margin on an item that cost you $10 all-in. You need net profit to equal your costs plus half the revenue — which means revenue has to cover the costs, the fee, and the profit. Rather than solving the algebra by hand for each platform's fee structure, just nudge the price in the calculator until the margin line hits 50%. Thirty seconds, exact answer, every time.

Doing this consistently changes how you shop. Once you know the listing price that hits your target margin, you instantly know your maximum buy price at the thrift store, estate sale or wholesale lot. You stop overpaying for inventory because the math told you to walk away before you ever touched the item.

Stop recalculating — track it

The calculator is perfect for the moment before you list. But a real reselling business needs the numbers after the sale too: actual fees paid, true cost of goods, profit per item, and which platform is quietly winning your year. That is what the paid tracker is built for — drop in a sale and it logs the fee, profit, margin and ROI automatically, then rolls it up so you can see your real bottom line at a glance.

Want to keep exploring first? Head back to the tools home page for the platform-specific calculators and fee guides.