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Free E-Commerce Tools for Online Sellers
Work out your fees, real profit and break-even ad spend in seconds.
Free calculators for eBay, Amazon, Shopify, Walmart and TikTok Shop sellers. No sign-up needed.
Marketplace Profit Calculator
Pick a marketplace to load typical fees, then adjust them to match your category.
Total fees–
Net profit–
Profit margin–
Fee presets are rough estimates and change by category and region — always confirm current fees on your marketplace.
Break-even ROAS & CPA Calculator
Find the maximum you can pay for a sale before ads stop being profitable.
Break-even CPA–
Break-even ROAS–
Target ROAS–
Want help growing your profit?
Our team can optimise your listings, ads and fulfilment to improve every number above.