Start with the fee base
The current US seller fee is 10% of the item price plus buyer-paid shipping. This calculator rounds the modeled fee half-up to cents; that rounding convention is an assumption, not a stated Mercari rule.
FREE US MERCARI SELLER CALCULATOR
What will you keep on Mercari?
A fee-only number can be misleading. See the seller fee, how the label settles, what reaches your sale balance—and what remains after your own costs.
YOUR NEXT SALE
Set the sale up.
Worked example loaded: a $40 item, $6 buyer-paid label, $16 acquisition, and $1 other cost. Edit any assumption, then calculate.
THE SETTLEMENT, MADE CLEAR
A fee is not the whole sale.
Mercari shipping can move money through checkout without making it your revenue. Follow the settlement first, then subtract the costs you actually carry.
Track where the label goes
A buyer-paid Mercari label is added at checkout and is not credited as seller revenue. A seller-paid label is deducted from the sale. For self-shipping, the seller pays postage outside Mercari; it reduces profit but not modeled platform proceeds.
Separate proceeds from revenue
Seller proceeds here means item price after modeled Mercari deductions, before acquisition and other item costs. Margin uses item price as seller revenue—never buyer-paid shipping or buyer sales tax.
Count costs once
Enter acquisition and other direct costs for an estimated profit. Buyer-paid label cost is a pass-through; seller-label cost is deducted by Mercari; self-shipping postage is an outside cost. The label is not subtracted twice.
THREE SHIPPING SETTLEMENTS
Three sales. Three shipping paths.
A $40.00 accepted item price with buyer-paid mercari label, $6.00 buyer shipping, $6.00 label/postage, $16.00 acquisition and $1.00 other costs: fee base $46.00, seller fee $4.60, seller proceeds $35.40 (not bank payout), profit $18.40. Seller revenue is $40.00; margin 46.00%; acquisition ROI 115.00%. Buyer label paid at checkout, not credited to you; no seller label deduction. Label cost equals buyer shipping and is counted once as pass-through, not again as your expense.
A $50.00 accepted item price with seller-paid mercari label, $0.00 buyer shipping, $7.00 label/postage, $20.00 acquisition and $2.00 other costs: fee base $50.00, seller fee $5.00, seller proceeds $38.00 (not bank payout), profit $16.00. Seller revenue is $50.00; margin 32.00%; acquisition ROI 80.00%. Free shipping to the buyer. Mercari withholds your label once from sale proceeds; do not subtract it again.
A $25.00 accepted item price with ship on your own (seller-paid), $0.00 buyer shipping, $8.00 label/postage, $15.00 acquisition and $1.00 other costs: fee base $25.00, seller fee $2.50, seller proceeds $22.50 (not bank payout), profit -$1.50. Seller revenue is $25.00; margin -6.00%; acquisition ROI -10.00%. Free shipping to the buyer. Postage paid outside Mercari is subtracted once for profit, not from modeled Mercari proceeds.
Illustrative figures use the fee model in us-standard-2026-10-09 · checked 2026-10-09 · seller fee effective 2025-01-06. Actual label quotes, eligibility, taxes, and account adjustments can differ.
SCOPE & SOURCE NOTES
A narrow model, with the boundaries in view.
For ordinary US Mercari sales, the model applies a 10% seller fee to item price plus buyer-paid shipping, effective January 6, 2025, based on Mercari's seller fee update (article 169). The separately described 3.6% Buyer Protection fee is paid by the buyer, and buyer sales tax is not seller revenue; neither is modeled as a seller fee.
Shipping behavior follows the shipping for sellers guide: buyer-paid Mercari labels are added at checkout and not credited to the seller; seller-paid labels are deducted from the sale; self-shipped postage is paid by the seller outside Mercari. Enter actual quoted costs. There are no live shipping rates, and package limits and label eligibility can vary—this tool does not promise a package qualifies.
Not covered: legacy transactions before January 6, 2025; non-US sales; local delivery; bundles; cancellations or returns; cash-out fees; promotions; unentered overhead; income tax; or time. Authentication and manual adjustments may be allocated in “other” once. Round-half-up fee cents are a calculator assumption; the source article does not publish a rounding rule. Inputs are bounded from $0 to $1,000,000, and item price must be positive. These are validation limits, not Mercari policy.
Source review checked October 9, 2026. The fee page lists forthcoming October 19 shipping prices and differs from the shipping guide on package limits. This calculator intentionally does not preset rates or resolve eligibility. Confirm the quote in Mercari's listing flow. Maintenance owner: tools owner t605, via manual official-source review before publication and after announced changes; no automated policy feed. See Mercari's shipping protection and package-limit notes (article 320).
Upcyclist is independent and is not affiliated with or endorsed by Mercari.
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Useful next step
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Mercari fee calculator FAQs
What fee does this Mercari calculator estimate?
For the current US model, it estimates a 10% seller fee on the item price plus buyer-paid shipping, effective January 6, 2025. The calculator rounds the modeled amount half-up to cents; that is a transparent modeling assumption because the official article does not state its rounding rule. Confirm the current fee terms for your order.
Is the 3.6% Buyer Protection fee taken from my sale?
No. Mercari describes Buyer Protection as a fee paid by the buyer. It is not included in the seller fee or seller revenue in this estimate. Buyer sales tax is also excluded from seller revenue.
Why isn't buyer-paid shipping counted as my revenue?
Mercari's buyer-paid label is added at checkout but not credited to the seller. It is included in the modeled seller-fee base, while seller revenue for margin remains the item price. This distinction avoids treating label money as profit.
How are seller-paid labels and self-shipping handled?
A Mercari seller-paid label is modeled as a deduction from the sale. With self-shipping, no buyer shipping is included in this model; enter the postage you pay and it is subtracted for profit only, not from modeled Mercari proceeds. Use the actual quoted costs.
Why can the estimate differ from my balance or payout?
“Seller proceeds” is only item revenue after the modeled Mercari fee and any seller-paid Mercari label. It is not a bank payout. Cash-out fees, promotions, returns, cancellations, bundles, taxes, account-specific adjustments, and unentered costs are outside this estimate.
Does the calculator check Mercari label prices or package eligibility?
No. It does not fetch shipping rates or verify package eligibility. Mercari's shipping options and limits can change and may differ by service. Check the current listing flow and official shipping guidance for your package.
What if I have no acquisition or other cost?
Enter the amount or use the explicit “Confirm $0” control. A blank cost is not silently treated as zero, so an incomplete cost estimate remains fee-only. With zero acquisition cost, acquisition ROI is unavailable.
Does it cover older or every kind of Mercari transaction?
No. The model is for ordinary US sales under the current fee schedule. It excludes pre-January 6, 2025 transactions, non-US sales, local delivery, bundles, cancellations and returns, cash-out fees, promotions, income tax, time, and unentered overhead. Read the linked official terms for your transaction.
Are my inputs stored or sent to an account?
No. Calculations and exports happen in your browser; financial values are not saved, sent to analytics, or transferred into Upcyclist. Pageview measurement is consent-aware, and calculator actions are not tracked.