Free Amazon Seller Tools
9 free calculators for Amazon FBA sellers and KDP publishers — profit & ROI, PPC metrics, royalties, spine width and more. Everything runs in your browser, nothing is uploaded.
FBA Profit & ROI CalculatorWork out your real profit, margin and ROI on any Amazon FBA product.
FBA Dimensional Weight CalculatorCalculate dimensional weight from package dimensions using Amazon's divisor.
PPC ACOS/ROAS CalculatorCalculate ACOS, ROAS and your break-even ad spend for Amazon PPC.
Profit Margin CalculatorCalculate profit, margin % and markup % from cost and selling price.
KDP Royalty CalculatorEstimate your Kindle eBook or paperback royalty using Amazon's published formulas.
KDP Spine Width CalculatorCalculate paperback spine width from page count and paper type.
Amazon Title/Bullet Character CounterLive character counts for your Amazon listing title and bullet points.
ASIN ExtractorExtract ASINs from any Amazon product URL, one per line.
UPC/EAN Barcode Check Digit ValidatorValidate or calculate the check digit for UPC-A and EAN-13 barcodes.