Selling on a marketplace like eBay, Etsy, or a similar platform looks straightforward until the money actually lands in your account. You listed an item for $100, the buyer paid $100, and yet the deposit is $86.45. That gap is the seller fee stack, and guessing at it is the fastest way to underprice inventory and wonder why your "profitable" sales are losing money. This seller fee calculator breaks the charge into its two parts — the percentage final value fee and the flat per-order fee — then goes a step further and subtracts your item cost and real shipping cost so you see the net profit you actually keep.
Adjust the inputs and every figure updates instantly. Start with a sale price, add any shipping you charged the buyer, and tune the fee rate and per-order flat fee to match your platform's current schedule.
How to Use
- Enter the Sale Price — what the buyer pays for the item itself, before shipping. This is the headline number on your listing.
- Set Shipping Charged to Buyer. If you offer free shipping, leave this at $0. If the buyer pays you $5.00 for shipping, enter $5.00. Most marketplaces charge their percentage fee on this combined total, not just the item price.
- Set the Final Value Fee Rate. eBay's standard rate is roughly 13.25% of the total sale; Etsy, Poshmark, and other platforms publish their own percentages. Use the rate that matches your category and store tier.
- Set the Fixed Per-Order Fee. This is the flat charge added to every sale, such as $0.30 per order. It is small, but it eats meaningfully into low-priced items.
- Expand the optional costs: enter your Item Cost (COGS) — what you paid to source the item — and your Actual Shipping Cost — what the carrier charges you. Leave these at $0 if you only want the platform-fee math.
- Read the result card. It shows the final value fee, the per-order flat fee, the Total Seller Fees (highlighted), the Net Proceeds After Fees, and the Net Profit after your own costs. The Effective Fee Rate line tells you what percentage of your sale price disappeared to the platform.
The key mental model: the platform takes a cut of everything the buyer paid you, including shipping, and then you still have to cover what you paid for the goods and the post office.
The Fee Formula
Most consumer marketplaces use the same two-part fee structure. The final value fee is a percentage of the total amount of the sale — item price plus what the buyer paid for shipping, taxes, and handling — and there is usually a small flat fee attached to each order.
Total Seller Fee = (Sale Price + Shipping Charged) × Fee Rate (%) + Fixed Per-Order Fee
Net Profit = (Sale Price + Shipping Charged) − Total Seller Fee − Item Cost − Actual Shipping Cost
Worked example: you sell an item for $100 with free shipping (shipping charged = $0). At a 13.25% final value fee and a $0.30 per-order fee, the percentage part is $100 × 0.1325 = $13.25, plus the $0.30 flat fee gives a Total Seller Fee of $13.55. Your net proceeds after fees are $100 − $13.55 = $86.45. If the item cost you $40 and shipping cost you $10, your true net profit drops to $86.45 − $40 − $10 = $36.45.
The flat fee is why cheap items are deceptive. On a $100 sale, $0.30 is noise. On a $10 sale, the $0.30 flat fee alone is 3% of the price before the percentage fee even applies.
Why the Effective Fee Rate Matters
The advertised percentage and the fee you actually pay differ. Because the flat per-order fee is layered on top, your effective fee rate — total fees divided by the sale price — is always slightly higher than the headline percentage. On the $100 sale above, total fees are $13.55 against a $100 price, an effective rate of 13.55%, not 13.25%. On a $20 sale with the same 13.25% rate and $0.30 flat fee, the fee is $20 × 0.1325 + $0.30 = $2.95, an effective rate of 14.75%. This is the number to watch when you compare platforms or decide whether free shipping is worth it.
Examples
Example 1 — The textbook $100 sale. A seller lists an item for $100 with free shipping, enters no item cost or shipping cost. Final value fee: $13.25. Fixed fee: $0.30. Total Seller Fees: $13.55. Net Proceeds: $86.45. This is the number most people recognize as "what eBay takes," and it matches the platform's own fee estimator.
Example 2 — With shipping charged and real costs. A seller charges the buyer $10 for shipping on a $50 item. The platform's 13.25% fee now applies to $60. Final value fee: $60 × 0.1325 = $7.95. Fixed fee: $0.30. Total Seller Fees: $8.25. After $20 item cost and $8 actual shipping cost, Net Profit is $50 + $10 − $8.25 − $20 − $8 = $23.75. Notice that charging the buyer shipping increased the fee base, even though it also recovered your postage.
Example 3 — A high-value listing. On a $1,000,000 sale (or a month of large-volume sales treated as one number), the 13.25% final value fee is $132,500 and the $0.30 flat fee is rounding error. Total Seller Fees: $132,500.30. Net Proceeds: $867,499.70. The calculator handles magnitudes of a million dollars without overflow, so you can test a full month of revenue in a single field.
Example 4 — The cheap-item trap. A $12 item at 13.25% plus $0.30: fee is $1.59 + $0.30 = $1.89, an effective rate of 15.75%. If the item cost $8 and shipping is $3, net profit is only −$0.89 — you lose money on the sale. This is exactly why high-volume low-price listings need the calculator, not intuition.
FAQ
How are marketplace seller fees calculated?
Seller fees are almost always two parts: a final value fee that is a percentage of the total sale (item price plus shipping the buyer paid) and a small flat fee per order. Add the item price and buyer shipping, multiply by the fee percentage, then add the per-order flat fee. On a $100 sale at 13.25% plus $0.30, the total fee is $13.25 + $0.30 = $13.55.
Does the marketplace charge fees on shipping the buyer pays?
Yes, most marketplaces charge the final value fee on the total amount the buyer paid, which includes shipping and handling charges, not just the item price. If the buyer pays you $5 for shipping on a $50 item, the percentage fee is applied to $55, not $50. Only free shipping (where you absorb postage) keeps the fee base at the item price.
What is the difference between net proceeds and net profit?
Net proceeds is what the platform leaves you after its fees — the money that actually deposits to your bank. Net profit goes further and subtracts what you paid for the item (COGS) and what you paid to ship it. A sale can have healthy net proceeds while still being unprofitable once your own costs are included. Always price against net profit, not net proceeds.
Why is my effective fee rate higher than the advertised percentage?
Because of the flat per-order fee. The advertised rate is only the percentage part; adding $0.30 (or more) per order lifts your total fees above the percentage alone. The smaller the sale, the larger this uplift. On a $20 item the effective rate can jump from 13.25% to nearly 15%, which is why low-price listings should be priced upward or bundled.
How do I use this to set my prices?
Work backwards. Enter your item cost, your expected shipping cost, and your desired profit, then raise the sale price until net profit clears your target. A common rule is to make sure the total fee stack plus your COGS leaves at least a 30% margin on casual listings. If the effective fee rate is already 14–16% before your costs, you cannot compete on a race-to-the-bottom price.
Do these fees apply to sales tax I collect?
In most cases the final value fee is calculated on the item and shipping total, and sales tax collected on behalf of the buyer is excluded from the fee base. Tax rules change by platform and by state, so confirm with your marketplace's current fee schedule rather than assuming — the rate field on this page lets you enter whatever percentage your platform publishes for your category.
Disclaimer
This seller fee calculator is provided for informational purposes only and does not constitute financial, tax, accounting, or legal advice. Fee rates, per-order flat fees, category-specific rates, and seller-performance discounts vary by platform, account tier, listing category, and region, and they change over time. The figures produced are estimates based on the inputs you enter and should be confirmed against your marketplace's current official fee schedule and your actual settlement reports before making pricing or sourcing decisions.