4 live tools · More on the way

Free Ecommerce
Calculators

SellerTools helps ecommerce and dropshipping sellers calculate exact profit, margins, fees, and ROAS targets — before they spend on inventory or ads. Every tool is free, instant, and requires no signup.

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Calculators ready to use

Every tool calculates instantly as you type — no button to press, no waiting. Share results with a single link.

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Dropshipping Profit Calculator

Calculate your exact net profit, ROI, and break-even ad cost per sale. Covers product cost, shipping, platform fees, payment fees, ad spend, and returns. Presets for Shopify, Amazon, eBay, Etsy, and WooCommerce.

Net Profit Net Margin % ROI Break-Even Ad Cost Monthly Projections
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Live

eBay Fee Calculator

See your exact eBay fees, net payout, and true profit margin. Includes final value fees, promoted listing rates, and payment processing. Category presets for General, Electronics, Fashion, Collectibles, and Motors.

Final Value Fee Net Payout Net Margin % Promoted Listings Total Fee $
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Live

Product Margin Calculator

Calculate gross margin %, net margin %, markup %, gross profit, and net profit — instantly. See exactly how platform and payment fees erode your true margin. Platform presets for Shopify, Amazon, eBay, and Etsy.

Gross Margin % Net Margin % Markup % Gross Profit Net Profit
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Live

Break-Even ROAS Calculator

Find the minimum ROAS your ad campaigns must hit before they become unprofitable. Accounts for product cost, shipping, platform fees, payment fees, and return rate. Set your CPA target before you launch.

Break-Even ROAS Break-Even CPA Ad Cost Limit Net Margin (pre-ads)
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In Development

Coming soon

More tools in the pipeline. Each one built to answer a specific question ecommerce sellers ask every day.

Coming Soon

Markup Calculator

Convert any two of cost, price, margin %, or markup % — instantly. Ideal for wholesale buyers setting retail prices or suppliers quoting trade rates.

In development
Coming Soon

Amazon FBA Calculator

Calculate your true Amazon FBA profit including referral fees, fulfilment fees, storage costs, and return processing — with presets for every major category.

In development
Coming Soon

TikTok Ads Profit Calculator

Factor in TikTok Shop commission, in-app payment fees, creator affiliate costs, and ad spend to find your true profit per sale from TikTok-driven traffic.

In development
Why SellerTools

Built for real sellers,
not spreadsheet nerds

Every tool on SellerTools is designed to give you one clear answer to one important question — without the complexity of a full accounting system or the guesswork of back-of-envelope maths.

Results as you type Every calculator updates live with every keystroke. No button to press. No loading spinner. Numbers update in real time so you can experiment freely.
Works everywhere Fully responsive on mobile, tablet, and desktop. Built to work at a trade show, in a warehouse, or at a desk — wherever you're making decisions.
Shareable results Every calculation is encoded in the URL. Copy the link and share your exact scenario with a supplier, business partner, or accountant — no screenshots needed.
No account. No data collected. All calculations happen in your browser. Nothing is sent to a server. No signup, no email, no tracking of what you enter.
100%

Permanently free

Every tool on SellerTools is and will remain completely free. No freemium, no trial limits, no hidden paywalls. Sellers at every stage deserve access to accurate numbers.

Platform-specific presets

One-click presets for Shopify, Amazon, eBay, Etsy, and more. Start from accurate defaults, not guesses.

Smart tips built in

Each calculator analyses your numbers and surfaces a contextual insight — not just raw figures, but what they mean for your product.

Visual breakdowns

Animated cost breakdown bars show where every dollar goes at a glance. See which costs are eating the most margin — and where to focus first.

No install required

Every calculator runs entirely in your browser. No app to download, no Chrome extension, no software to install or maintain.

Know your numbers before you sell

Pick a calculator, enter your product details, and get exact profit, margin, and ad targets in under a minute.

Open Dropshipping Calculator