19 Free E-Commerce Calculators & Tools
No sign-ups. No email walls. 100% client-side calculations with 2026 platform rates. Compare net margins, calculate break-even ROAS, and optimize fee structures.
Profit & Fee Calculators
Amazon FBA Profit & Fee Calculator
Calculate true Amazon FBA net profit, margins, ROI, and break-even price factoring in referral fees, fulfillment, returns, and ad spend.
Walmart Marketplace & WFS Fee Calculator
Compute Walmart Marketplace referral fees, WFS fulfillment charges, and net seller margin.
TikTok Shop Fee & Affiliate Calculator
Calculate TikTok Shop referral fees (6%), creator affiliate commissions, sample shipping, and net profit.
eBay Fee & Net Profit Calculator
Calculate eBay final value fees, insertion charges, store subscription discounts, and Promoted Listings standard/advanced.
Etsy Fee & Margin Calculator
Compute listing fees ($0.20), 6.5% transaction fee, payment processing, and Offsite Ads deductions.
Multi-Marketplace Fee Comparison Tool
Compare net margins side-by-side on a $50 product across Amazon, Walmart, TikTok Shop, eBay, and Shopify.
Advertising & Growth
Shopify Unit Economics & Break-Even ROAS
Determine maximum allowable CPA, break-even ROAS on Meta/Google Ads, and bottom-line margin for DTC orders.
Amazon ACoS & TACoS Calculator
Calculate Advertising Cost of Sales (ACoS), Total ACoS (TACoS), and Break-Even ACoS.
Operations & Logistics
Freight & Landed Cost Calculator (China → US/UK)
Compute true unit landed cost from factory gate to warehouse door, including ocean/air freight, duty tariffs, and inspection.
Inventory Reorder Point & Safety Stock
Calculate exact inventory reorder thresholds and safety stock to prevent expensive stockouts on Amazon and Shopify.
Supplier Quote Comparison
Compare up to 3 real supplier quotations side-by-side on true landed cost per unit, not just quoted unit price.
Listing & Image Content Tools
Product Image Uniqueness Editor
Crop, flip, re-color, and watermark supplier product photos into unique images directly in your browser — no uploads, no sign-up.
Product Title & Description Rewriter
Turn your product name, keywords, and features into unique, marketplace-ready titles, bullet points, and descriptions.
Product Validation Checklist
An 11-point Pass/Caution/Fail checklist across demand, competition, profitability, sourcing, and compliance risk before you commit inventory capital.
Scorecards & Audits
Amazon Account Health & Margin Scorecard
Interactive 10-point audit evaluating your listing SEO, PPC TACoS efficiency, FBA storage fees, and account health risk.