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Commerce · July 8, 2026

SellerSum

Free fee & profit calculators for eBay, Etsy, PayPal, Stripe

SellerSum launched on July 8, 2026 with 2 votes.

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What it does

SellerSum is a suite of 13 free fee and profit calculators for online sellers — eBay, PayPal, Etsy, Stripe, Square, Whatnot, Depop, Poshmark, Mercari — plus a marketplace fee comparison hub and a food-cost calculator. Every rate is sourced from official marketplace fee pages with dates, a changelog tracks every fee change, and free email alerts notify you when fees change. No signup, no paywall.

Free, source-cited fee and profit calculators for online sellers: eBay, Etsy, PayPal, Stripe, Square and more. Verified against the marketplaces

Free fee & profit calculators for online sellers. Every number is quoted from the marketplace's official fee page, dated, and tested against the marketplace's own published examples. We'll email you when the fees change. 13.6% final value fee, per-order fee, category exceptions — and what you actually keep. 3.49% + $0.49 and every other rate — plus what to charge to receive an exact amount. All four Etsy fees on one sale — listing, 6.5% transaction, processing, Offsite Ads. Four resale apps, four different fee models — one calculator with each platform's verified rates. Margin, markup and profit from any two numbers — and pricing for a target margin. Cost + markup → price, with the margin…from sellersum.com

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