SellKitHub

Free Fee & Profit Calculators for Online Sellers

Know what Etsy, eBay, Amazon, Shopify, PayPal and Stripe really keep — fee by fee, line by line — before you set a price. Every rate is sourced to the platform's official fee schedule and dated.

  • ✓ 7 Free Calculators
  • ✓ No Sign-Up
  • ✓ Fees sourced to official schedules
  • ✓ Calculations run in your browser

🛒 Marketplaces calculators

What the marketplace keeps before you see a cent.

Marketplaces

Etsy Fee Calculator

Listing, 6.5% transaction, payment processing and Offsite Ads — your true profit per sale.

 Marketplaces

eBay Fee Calculator

Final value fee by category plus the per-order fee, with profit left over.

 Marketplaces

Amazon FBA Calculator

Referral fee by category plus FBA fulfillment, per-unit profit, margin and ROI.

💳 Payments calculators

What the payment processor takes — and how to gross up.

Payments

PayPal Fee Calculator

US commercial fees — plus what to charge to actually receive the amount you want.

 Payments

Stripe Fee Calculator

2.9% + $0.30 card fees, net received, and the reverse gross-up.

🏪 Storefront & Profit calculators

Your own store's per-order profit, and margin math that holds up.

Storefront

Shopify Profit Calculator

Profit per order after card fees, product, shipping and ad costs.

 Profit

Profit Margin Calculator

Margin vs markup — and the price that hits your target margin.

Why sellers check fees before they price

Marketplace fees are stacked, not single: a listing fee here, a percentage on price and shipping there, a per-order fixed fee on top. A product that looks profitable at a sticker margin can lose money once every layer is counted — especially low-priced items, where fixed fees bite hardest. SellKitHub exists to make that stack visible in one place, with the formula and a worked example on every page.

Every rate on this site lives in a single fee file, dated and sourced to the platform's official schedule, and reviewed when platforms announce changes. Where a platform's schedule is too detailed for a simple model (for example Amazon's full size-tier table), the page says so plainly and labels its figures as representative examples instead of pretending to be exact.

Frequently asked questions

Are these calculators really free?

Yes. Every calculator on SellKitHub is free with no sign-up and no subscription. All calculations run locally in your browser.

How accurate are the fees?

Every rate comes from one central fee file where each figure carries its official platform source. Fees were last updated in Oct 2026. Platforms change fees regularly, so verify against the official fee schedule before making pricing decisions.

How is my data handled?

Your inputs never leave your device — they are processed locally in your browser and never sent to our servers. See our Privacy Policy for how advertising cookies work.

Can I share a calculation with someone?

Yes. Every calculator page has a “Copy link to this calculation” button that encodes your inputs into the link — anyone opening it sees the same numbers and results.

Which platforms do you cover?

Etsy, eBay, Amazon FBA, Shopify, PayPal and Stripe, plus a general profit margin calculator. More platforms are added as their fee schedules are verified against official sources.