Profit Calculator for E-commerce Sellers

Instantly calculate profit margin, break-even price, and suggested selling price — free, private, no sign-up needed.

Features

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Pre-loaded fee rates for Amazon (15%), Mercari (10%), Shopify (2%), eBay (13.25%) — or enter your own custom rate.

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Every field updates instantly as you type. No 'Calculate' button needed — see profit and margin change live.

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Automatically shows the minimum break-even price. Enter a target margin to get a suggested selling price in reverse.

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Preview what happens to profit if you raise or lower the price by 5% or 10% — great for pricing decisions.

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Save up to 20 calculation records with product names. Tap any history entry to restore inputs instantly.

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Download the results as a PNG image to share in reports, chats, or presentations.

Click one of the platform buttons (Amazon, Mercari, Shopify, eBay) to auto-fill the fee rate, or choose Custom to enter your own.

Fill in product cost, shipping fees, and your intended selling price. Results update in real time as you type.

Review your profit, profit margin gauge, break-even price, and cost breakdown. Use the target margin field to find the optimal selling price.

Add a product note and save the record for future reference, or export the results as a screenshot.

Is this profit calculator free to use?

Yes, completely free with no sign-up required. All calculations run locally in your browser.

Does my data get uploaded to a server?

No. All calculations happen in your browser. History is saved to your device's local storage only — nothing is ever sent to a server.

Which platforms are supported?

Amazon (15%), Mercari (10%), Shopify (2%), and eBay (13.25%) are pre-loaded. You can also enter any custom fee rate manually.

How is the break-even price calculated?

Break-even price = Total Cost ÷ (1 − Fee Rate). This is the minimum selling price that covers all your costs with zero profit.

How does the suggested price work?

Enter your target profit margin (e.g. 20%). The tool reverse-calculates the selling price needed to achieve that margin after platform fees.