About SellerElf
SellerElf builds free profit tools for cross-border ecommerce sellers.
What SellerElf is
SellerElf is a free profit calculator for Amazon FBA and FBM and for TikTok Shop (FBT and self-fulfilled) across the US, German and Japanese marketplaces. There is no account and no signup: enter your numbers and the calculator returns net profit and margin instantly. It is built for sellers who need a fast, honest read on whether a product actually makes money after fees, storage, advertising and returns.
How we calculate
You provide the product cost, selling price, dimensions and weight, referral rate, fulfillment, storage, advertising (ACoS) and expected return rate. The calculator applies the selected marketplace's fee structure and returns gross profit, net profit and margin per unit and per month. The core formula is:
Net profit = revenue − (referral fee + fulfillment / size-tier fee + storage + advertising (ACoS) + return loss)Fulfillment uses the greater of unit weight and dimensional weight, which is why a light but bulky item can cost more to ship than its scale weight suggests. All results are estimates based on the inputs you provide and the published fee schedules described below.
Fee data sources
Fee data is modeled from Amazon's published referral, fulfillment (size-tier) and storage fee schedules for the US, Germany and Japan, and from TikTok Shop's published fee tables. Figures on this site are as of 2026-10-02. Amazon and TikTok change fees periodically, so confirm current rates against the marketplace's official fee schedule before making a decision.
Update cadence
We review the fee tables periodically and update them when a marketplace publishes a fee change. If you spot a rate that looks out of date or does not match the marketplace, tell us on the contact page and we will investigate.
Who we are
SellerElf is a small, independent team of ecommerce and software people. We are not affiliated with, endorsed by, or sponsored by Amazon or TikTok. Our tools are for estimation and education only and are not tax, accounting, legal or financial advice.