AmzEngine
100% Free · No sign-up required

Free Amazon
Seller Tools

Instant calculators and analyzers for Amazon FBA sellers. Calculate profit, fees, ACOS and ROI, then analyze your listings and reviews - all in your browser, completely free.

No data leaves your browser· 12 free tools

Profit & Fees

Profit Calculator

Net margin, profit per unit & break-even price.

FBA Calculator

FBA fulfillment, referral & storage fees by tier.

ROI Calculator

Return on investment per unit before you buy.

Advertising

ACOS Calculator

Advertising Cost of Sale from ad spend & ad sales.

TACOS Calculator

Total Advertising Cost of Sale across all revenue.

Break-even ACOS

The ACOS where PPC stops being profitable.

Listing & Keywords

Listing Analyzer

Score your listing against Amazon best practices.

Keyword Coverage

See which target keywords your listing is missing.

Keyword Cleaner

Dedupe, normalize and clean bulk keyword lists.

Keyword Density

Frequency & density to catch keyword stuffing.

Validation & Reviews

Product Validation

Go / Caution / Avoid verdict for any product idea.

Review Analyzer

Sentiment, themes & rating split from raw reviews.

Want live data, not just calculators?

AmzEngine pulls real sales estimates, BSR, fees and PPC metrics across every marketplace so you never have to guess again.

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