Packaging, shipping, returns, payment fees. Every order has costs that don't show up in your dashboard. This blog helps you find them, measure them, and understand what they mean for your business.
Thousands of e-commerce sellers grow their revenue every month while quietly losing money on every single order. The gap between what hits your bank account and what actually stays there is where unit economics lives.
Consider a product you sell for $35. After Shopify or WooCommerce takes its cut, after PayPal or Stripe charges its percentage, after you box it up and buy the tape and the bubble wrap, after USPS or UPS gets paid, after a small percentage of customers return it and you refund them fully, the actual money you keep is almost certainly not what you imagined when you priced it.
This blog exists to walk through that calculation, step by step, with real numbers and downloadable spreadsheets. No financial advice. No promises about what you should do with what you learn. Just the math, explained clearly.
See the full calculation walkthrough
Each guide starts with a question that actual e-commerce sellers have asked. The answers go deeper than most introductory content.
Most sellers forget at least two or three line items when they calculate what an order costs. Packaging materials, dunnage, inserts, the weight variance that pushes you into the next shipping tier. This guide builds the full picture.
Read the guideA lemonade stand makes this concept concrete. Understanding what contribution margin actually measures, and why it matters more than gross margin for day-to-day decisions, changes how you read your numbers.
Read the guideHeavy items with low prices. Fragile products with high return rates. Bundles priced before shipping costs were known. Identifying which SKUs are actually costing you money is the first step toward fixing it.
Read the guideFree shipping is a marketing decision that carries a real cost. Without knowing your average order weight, your carrier rates, and your margin per order, offering free shipping is essentially a guess about whether you can afford it.
Read the guide
The data is already there in your order management system, your carrier invoices, your payment processor reports. Knowing how to read it together is what unit economics is about.
Start with the Basics
Imagine a lemonade stand. Each cup sells for $2. The lemons, sugar, water, and cup cost $0.80. That $1.20 left over is not profit. It is the amount each cup contributes toward the table rental, the sign, the time you spent setting up. Those fixed costs exist whether you sell one cup or one hundred.
Contribution margin is that $1.20. It answers the question: does selling more of this product actually help, or does it just generate more work for the same financial outcome?
For e-commerce, the variable costs include more than just product cost. Payment processing fees move with every transaction. Some shipping costs vary by order. Returns create a cost that scales with volume. The lemonade stand guide walks through how to apply this thinking to a real product catalog.
Read the full lemonade stand breakdownEvery example uses realistic product types, realistic margins, and realistic fee structures from actual payment processors and carriers. Nothing is invented to make the math look cleaner than it is.
Each major guide includes a downloadable template. Fill in your own numbers and the formulas do the rest. The templates are designed to be modified, not just used as-is.
This site does not offer financial advice. It explains concepts and provides tools. What you decide to do with the information is entirely your own determination, made with your own knowledge of your business.
Accounting language is useful but not always accessible. These guides translate the concepts into the language of someone who knows their products and customers but finds financial terminology opaque.
Every guide on this site includes a downloadable spreadsheet template. No email required. No account signup. Just tools that help you apply the concepts to your own numbers.
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