Marketplace fees are only one part of the cost of selling online. This guide shows you how to calculate net proceeds after selling fees, payment processing, shipping, packaging, promoted listings, refunds, and withdrawals—so you can compare platforms using the money you actually keep rather than the headline sale price.
Overview
The best marketplace to sell online is not necessarily the platform with the largest audience or the lowest advertised fee. The better choice depends on your item’s price, category, shipping method, return risk, payment workflow, and the amount of work required to complete the sale.
A useful marketplace fees comparison begins with one question: How much cash remains after every cost connected with this sale? That figure is your net proceeds. You can then compare it with your item cost to estimate profit.
Use these two basic formulas:
- Net proceeds = buyer payment received − marketplace fees − payment fees − shipping paid by seller − packaging − promotion − withdrawal charges − refunds or adjustments
- Estimated profit = net proceeds − item cost − other direct costs
Do not confuse the amount charged to the buyer with the amount you keep. A marketplace may collect shipping or tax from the buyer, while only some portions of that transaction affect your seller balance. Your worksheet should record each amount separately and follow the platform’s actual settlement statement whenever possible.
For a broader category comparison, see our guide to best buy-sell marketplaces by category. The right platform for clothing may not be the right one for bulky furniture, used electronics, or wholesale inventory.
How to estimate
Before listing an item, create one row in a spreadsheet or calculator for each marketplace you are considering. Use the same sale price and item cost for every platform so the comparison remains fair.
- Set the expected sale price. Use a realistic price based on comparable sold items, not only current asking prices. If you expect negotiation, calculate both your target price and your minimum acceptable price.
- Separate fixed and percentage charges. A percentage fee changes with the sale price. A fixed order fee has a larger effect on lower-priced items. Record them in separate columns.
- Calculate payment-related costs. Include payment processing when it is charged separately. Do not assume that a marketplace’s selling fee includes every payment charge.
- Enter the seller-paid shipping amount. Use the shipping label cost or a conservative estimate based on the packed weight and dimensions. Include any shipping discount or reimbursement only if you are confident it applies to your transaction.
- Add packaging and preparation. Boxes, mailers, tape, labels, cleaning materials, and replacement parts can turn a seemingly profitable sale into a weak one.
- Include optional costs. If you use promoted listings, paid visibility, an insertion upgrade, a subscription plan, or a cross-listing tool, add the portion attributable to this item.
- Allow for risk. For items with a meaningful chance of return, damage, cancellation, or buyer dispute, create a separate risk scenario rather than hiding the cost in a vague percentage.
- Compare the result. Rank platforms by net proceeds, but also note the work involved, delivery requirements, payout timing, and the likelihood that your item will sell at the assumed price.
A simple selling fees calculator can use this worksheet:
| Input | Example entry | How to treat it |
|---|---|---|
| Sale price | $120.00 | Use the expected completed-sale price |
| Marketplace percentage fee | Enter the applicable rate | Multiply the fee base by the rate |
| Fixed marketplace fee | Enter the applicable amount | Apply per order or listing as stated |
| Payment processing | Enter separately if applicable | Check whether it includes a fixed component |
| Seller-paid shipping | Enter packed-item estimate | Use the actual label cost after sale |
| Packaging | Enter per-item cost | Allocate bulk supplies consistently |
| Promotion | Enter estimated charge | Include only if the listing uses it |
| Item cost | Enter acquisition cost | Use zero only when the item truly had no cost |
In a spreadsheet, the core calculation can be written as: sale price − (percentage fee × fee base) − fixed fees − processing − shipping − packaging − promotion − other direct costs. Keep the fee base visible. Some charges may be calculated on the item price, while others may use a broader transaction amount according to the platform’s rules.
Inputs and assumptions
The quality of your answer depends on the quality of your inputs. Before relying on a comparison, confirm the following details in the marketplace’s current seller documentation or your own account statement:
- Which categories have special fee rules or exclusions?
- Is the fee charged on the item price, shipping, discounts, or another transaction amount?
- Are payment processing charges included in the main selling fee?
- Does the seller pay for shipping, or is shipping deducted from the payout?
- What happens if the buyer returns the item or receives a refund?
- Are promoted listings charged per click, per sale, or under another arrangement?
- Are there seller-plan, listing, subscription, or withdrawal charges?
- When is the payout available, and can a reserve or adjustment affect the balance?
Use three scenarios when the result is uncertain: target, conservative, and best case. The conservative version might use a lower sale price, higher shipping cost, and a possible return-related expense. This is more useful than presenting a single precise number that depends on optimistic assumptions.
For pricing inputs, our used-item pricing framework can help you build a comparable-sales range. For listing quality, see how to write marketplace listings that sell faster. Better photos and clearer descriptions do not remove fees, but they may help you test a stronger price instead of competing only on discounting.
Worked examples
Suppose an item sells for $120. You acquire it for $45, spend $4 on packaging, and pay $10 for shipping. Platform A charges a percentage selling fee and a fixed order fee; payment processing is included in that platform’s settlement. Platform B charges a different percentage, a separate processing amount, and no fixed order fee. Because the exact rates can change, enter the current values from each platform rather than copying a rate from an old comparison.
The calculation for Platform A would be:
$120.00 − percentage fee − fixed fee − $10.00 shipping − $4.00 packaging = net proceeds.
Then calculate profit:
net proceeds − $45.00 item cost = estimated profit.
For Platform B, use the same sale price, item cost, shipping, and packaging. Subtract its percentage fee and separate processing charge. If Platform B requires a paid promotion to reach the assumed sale price, show that charge as a separate scenario. This prevents an unfair comparison in which one platform receives an optimistic organic-sale assumption while another includes marketing costs.
Now test a lower sale price. A platform with a higher percentage fee might still produce more net proceeds if it supports a higher completed-sale price. Conversely, a platform with a lower fee may be less attractive when its fixed charges, shipping requirements, or lower expected selling price are included. The comparison should therefore answer two questions: What do I keep per sale? and How realistic is the assumed sale?
For multi-platform sellers, track the same fields in every listing record. A cross-listing workflow can save time, but it can also create duplicate-sale or inventory errors if quantities are not updated promptly. Review our guide to cross-listing tools for sellers before adding software costs to your worksheet.
When to recalculate
Recalculate your marketplace net profit whenever a pricing input changes—not only when you notice a new headline fee. Review the worksheet before listing a new product category, changing your shipping method, accepting offers, or turning on promoted placement.
At minimum, revisit it when:
- the marketplace changes seller fees, payment charges, subscription plans, or payout rules;
- your seller volume changes enough to affect a plan or fee tier;
- carrier rates, packaging costs, or item dimensions change;
- you begin offering free shipping, returns, discounts, or promoted listings;
- your average sale price moves into a different range;
- you start selling internationally or across additional tax or customs environments;
- refunds, disputes, cancellations, or failed deliveries occur more often than expected.
Keep a dated copy of each fee worksheet and label every assumption. Compare estimates with actual settlement statements after several completed sales. If the difference is consistent, update the model instead of treating it as an unexplained loss.
Finally, remember that fees are only one part of the decision. A marketplace that leaves slightly less per transaction may still be worthwhile if it reduces listing time, reaches the right buyers, or provides a safer payment and delivery workflow. The most useful online marketplace comparison combines net proceeds, sale probability, labor, and risk. Recheck those inputs whenever the platform, product, or selling process changes.
