Free Shopify & E-commerce Calculators for Sellers

Calculate product profit, break-even, ROI, ad performance and inventory in seconds. 100% free, runs in your browser, no signup required.

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Also supports Amazon FBA sellers

Free Tools for Online Sellers

All calculators run locally in your browser. Your data never leaves your device.

Shopify Profit Calculator

Calculate real net profit and margin for your Shopify DTC store, with all hidden costs included.

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ACoS / ROAS Calculator

Know your break-even ACoS & ROAS. Find out if your ads are actually making money.

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Break-Even Calculator

How many units must you sell to cover all costs? Find your break-even point fast.

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ROI Calculator

Evaluate product investment returns: ROI, annualized CAGR and payback period.

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Inventory & Safety Stock Calculator

Optimize reorder points and safety stock. See how holding cost eats into your profit.

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Amazon Profit Calculator

Estimate net profit for Amazon FBA / FBM with referral fees, fulfillment and refund loss.

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Why Use Our Tools

Built for real sellers, with real costs.

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100% Local & Private

All calculations run in your browser. No upload, no signup, no tracking of your numbers.

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Instant Results

Real-time calculation as you type. No submit button needed.

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Seller-Specific Costs

Platform fees, ads, tariffs, refunds, FBA fees — the costs other calculators forget.

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Advanced Features in Extension

Bulk calculations, export and history live in our optional browser extension.

From the Blog

Guides to help you price, advertise and stock smarter.

How to Calculate Real Shopify Profit

Hidden costs most DTC sellers miss — and how to price to actually make money.

Break-Even ACoS vs ROAS Explained

The simple math behind profitable Amazon and Shopify advertising.

Safety Stock for Amazon FBA

Stop stockouts and overstock: a practical guide to safety stock & reorder points.

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