Web app · Seller calculators

Know your real margin. Before you list.

CalcForSellers has 29 free calculators for people who sell online: marketplace and payment fees, profit margin, pricing, break-even and ad spend. Every one shows its formula and a worked example, so you can check the math instead of trusting it.

Open CalcForSellers → See the calculators
Free No sign-up Live
Features

Fees, margins and ad spend in one place

Pick the number you need. Each calculator explains how it got there.

Marketplace fee calculators

Shopify, Etsy, Amazon FBA, eBay, TikTok Shop and other marketplaces: what the platform takes from one sale, and what you keep.

Pricing and profit

Profit margin, markup, break-even and discount calculators, so you can price a product before you list it.

Payment fees side by side

Stripe, PayPal, Square, Venmo and Cash App fees on the same sale, and what to charge to receive a set amount.

Ads and customers

ROAS, target CPA, customer acquisition cost, CPM, CPC, CTR and customer lifetime value for your ad spend.

Formulas you can check

Every calculator shows its formula and a worked example, and fee pages say which fee schedule they use and when it was last checked.

Free, no sign-up

No account and nothing to install. The numbers are worked out in your browser.

Popular

The calculators sellers use most

Etsy → fees
Listing, transaction and payment fees on one sale
Shopify → fees
What Shopify and its payment processing take from an order
Amazon FBA → profit
Referral fee by category, FBA fees, profit and ROI per unit
Cost → margin
Profit, margin and markup from your cost and price
Ad spend → ROAS
Return on ad spend, and the ROAS you need to break even
Shopify → vs Etsy
Total fees on one sale on each platform

29 calculators in four groups (pricing and profit, marketplace fees, payment fees, ads and customers), plus guides that explain each platform's fees: calcforsellers.com

Screenshots

See it in action

CalcForSellers home page with the calculators grouped by pricing, marketplace fees, payment fees and ads
Every calculator, grouped by what you need to work out.
Etsy fee calculator showing the fees on a sale and the profit after them
The Etsy fee calculator with a result: the fees and what you keep.
CalcForSellers guide that explains Etsy fees
Guides explain each platform's fees in plain words.
FAQ

Common questions

Is CalcForSellers free?
Yes. All the calculators are free and need no account.
How do I know the numbers are right?
Every calculator shows the formula it uses and a worked example you can type in to get the same result. Fee calculators say which fee schedule they use and when it was last checked, because platforms change their fees.
Which platforms are covered?
Shopify, Etsy, Amazon FBA, eBay, TikTok Shop, Whatnot, Depop, Poshmark and Mercari for selling fees, and Stripe, PayPal, Square, Venmo and Cash App for payment fees.
Are the results financial advice?
No. They are estimates to help you plan, not tax, legal or financial advice. Check fees with your platform before you rely on them.
Who makes it?
MatrixInn Solutions, a small team that builds Shopify apps. The same questions about margins and fees kept coming up from store owners, so we put the answers in one place.

More from MatrixInn

CalcForSellers is one of our free tools, next to our Shopify apps for store owners. See the rest of our apps, plugins and extensions, or tell us what you would like built.

All products Start a project →