Ecommerce Profit Engine

Calculator Marketplaces Compare Tools Guides Start Calculating

GLOBAL ECOMMERCE PROFITABILITY

Know your real profit before you sell.

Model marketplace fees, product costs, shipping, fulfillment, advertising and returns in one place. Compare the same SKU across Amazon, Shopify, Etsy, eBay and TikTok Shop.

Calculate My Profit Compare Marketplaces

MODELED PROFIT / ORDER$18.4236.8% contribution margin

Break-even
$31.57

Max CPA
$18.42

Monthly profit
$9,210

ROAS
4.2×

Flagship profit calculator

The hardened calculation engine sits underneath the Stage 4 production UI. Marketplace-specific fee logic remains isolated while the product economics stay consistent.

Production calculator modules

Inputs

Price, COGS, shipping, fulfillment, advertising, returns and operating costs.

Marketplace logic

Amazon, Shopify, Etsy, eBay and TikTok Shop adapters.

Outputs

Profit, margin, monthly profit, break-even, cost waterfall and comparison.

Five marketplace engines

Referral, selling plan, FBA, storage and ads.

Plans, payments, transaction fees and apps.

Etsy

Listings, payments, Offsite Ads and FX.

eBay

Final-value, order, insertion and Store fees.

TikTok Shop

Referral, creator, refunds, FBT and ads.

Which marketplace is best for this SKU?

Use one product profile and compare modeled economics channel by channel.

Open Marketplace Comparison

Ecommerce profitability guides

Contribution margin vs net profit

Understand the difference between product-level decisions and company accounting.

Break-even ROAS

See how gross margin and fees determine your advertising ceiling.

Amazon vs Shopify economics

Compare marketplace reach with direct-store economics using identical assumptions.

Browse all ecommerce profitability guides