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Calculator library

One clean model for each ecommerce decision.

Choose a calculator, replace the defaults with actual data, and keep the resulting threshold next to the decision it controls.

Marketplace fees

Etsy Fee & Profit Calculator

Estimate Etsy transaction, payment, listing, Offsite Ads and country-specific fees, then see profit, margin and the break-even item price.

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Advertising

Break-even ROAS Calculator

Calculate the maximum CPA and minimum ROAS that keep an ecommerce order at break-even after product, shipping, payment and return costs.

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Unit economics

Product Margin Calculator

Calculate gross margin, contribution margin, markup, net profit per order and break-even price with fees, shipping, returns and acquisition cost included.

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Store economics

Shopify Store Profit Calculator

Estimate monthly Shopify operating profit from revenue, orders, COGS, payments, fulfillment, returns, apps, fixed costs and advertising.

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Sourcing

Landed Cost Calculator

Estimate landed cost per unit from goods, freight, insurance, customs value, duty, import tax, brokerage, port, inspection and domestic delivery.

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Operations

Return Rate Impact Calculator

Estimate monthly profit lost to ecommerce returns, cost per return, margin after returns and the return rate that would consume gross profit.

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Pricing

Wholesale Price & MSRP Calculator

Calculate wholesale list price, discounted invoice price and suggested MSRP while preserving maker margin after commission, overhead and MOQ discounts.

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Shipping

Dimensional Weight Calculator

Compare actual and dimensional weight for one or multiple packages with an editable divisor in metric or imperial units.

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Inventory

Reorder Point Calculator

Calculate reorder point, safety stock, days of inventory and a case-pack-rounded order quantity from demand, lead time and review period.

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Pricing

Discount Profitability Calculator

Compare baseline and promotional profit, calculate required unit uplift, and estimate the maximum discount supported by your projected volume increase.

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A deliberate constraint

We do not publish a page for every keyword variation.

Each tool must have a distinct calculation, a documented use case and enough original explanation to stand on its own. Variants belong inside editable inputs, not as hundreds of near-duplicate pages.