About
Calculators built by sellers, for sellers
emallsoon exists because every seller makes the same expensive discovery: the price on the tag is not the money in your pocket.
Why this site exists
Platform fee structures are designed to be felt, not calculated. Referral percentages that scale with your price, fulfillment tiers that change with a packaging tweak, Offsite Ads that quietly take 15% of a random quarter of your orders — each deduction looks small, and together they decide whether a business works.
Most fee calculators online are lead magnets: enter your email, get a number, receive drip marketing forever. These tools are the opposite. No account, no email wall, no tracking of your numbers — every calculator runs entirely in your browser and the math is documented right below each one.
Methodology
Every calculator starts from the platform's published fee schedule (Amazon Seller Central, Shopify pricing docs, Etsy fee help center) and then does one honest thing: leaves every field editable. Fee rates change constantly and vary by category, size, country, and plan — a calculator that hides its assumptions is a calculator you should not trust. Each tool page shows its formulas in plain text, and the FAQ covers the common edge cases.
When a platform revises its fees, the defaults here are updated — but you should always sanity-check against your own account before committing real money to inventory or ad budgets.
Privacy
There is no account system and no server-side calculation. The numbers you type never leave your device. The site is served as static files from a CDN; that is the entire infrastructure.
Roadmap
- Break-even units calculator — how many sales until fixed costs are covered
- Discount pricing calculator — what a 20% coupon really costs you
- Amazon storage fee estimator (monthly + long-term)
- Platform comparison — the same product on Amazon vs. Shopify vs. Etsy
Contact
Found a wrong default, a broken formula, or a calculator you wish existed? The best way to reach us is wherever you found this site — and if you found it in a seller community, that community is probably where the feedback thread lives too.