Most DTC founders quote a margin based on COGS. That number is almost always wrong — not by a rounding error, but by 5 to 15 percentage points. True product cost includes the raw product cost, inbound freight per unit, duties and tariffs, outbound fulfillment per order, the cost of returns, and payment processing fees. When you stack all of those on top of naive COGS, the margin you are actually earning is dramatically lower than the number in your pitch deck. This calculator forces the full stack. Enter product cost, inbound freight per unit, duties and tariffs, fulfillment per order, return rate, payment processing percentage, and selling price — and see your true landed cost, all-in cost per order, true margin in dollars, true margin percentage, and the margin erosion versus a naive COGS-only calculation.
As a percentage of product cost.
Pick, pack, and outbound freight.
Landed Cost per Unit
$12.50
All-In Cost per Order
$25.43
True Margin per Order
$19.57
True Margin %
43.49%
Margin Erosion vs Naive COGS
34.29 pts
Landed cost per unit is Product Cost plus Inbound Freight per Unit plus (Product Cost multiplied by Duties and Tariffs Percentage). This is the true cost of getting one unit into your warehouse ready to sell. All-in cost per order adds outbound fulfillment, payment processing on the selling price, and an expected return cost (Return Rate multiplied by the combined landed cost and fulfillment, which is lost or degraded when a return occurs). True margin in dollars is Selling Price minus All-In Cost per Order. True margin percentage is True Margin Dollars divided by Selling Price. Margin erosion is the difference between the naive COGS-only margin ((Selling Price minus Product Cost) divided by Selling Price) and the true margin percentage — expressed in margin points. This is the number that shows you how much your pitch-deck margin is lying to you. The model uses average return cost as a proxy; in reality, return cost varies by SKU and return disposition (resellable, damaged, discarded), and a full model should weight return cost across disposition outcomes. Duties are modeled as a simple percentage of product cost, which works for most US inbound shipments but not for complex multi-category containers.
For a typical mid-market DTC brand, the gap between naive COGS margin and true margin is 15 to 25 percentage points. A product quoted at 78 percent gross margin (10 cost, 45 price) often lands at 55 to 60 percent true margin after inbound freight, tariffs, fulfillment, returns, and payment fees. That is not a rounding error — it is the difference between a profitable unit and a break-even unit at scale. The margin erosion is worst in three scenarios: products with high tariff exposure (many categories saw 15 to 25 point tariff jumps in recent cycles), products with high return rates (apparel and footwear), and products with low selling prices where the fixed fulfillment cost represents a huge percentage of the order. Brands that model true product cost correctly make dramatically better pricing, promo, and channel decisions. Brands that still quote naive COGS margin are systematically over-spending on CAC, under-pricing, and over-discounting — and then wondering why the bank balance keeps shrinking.
True product cost is the foundation of a real profit floor. The inputs to this calculator — landed cost, tariffs, fulfillment, return rate, payment processing — are exactly the cost components Agentis ingests per SKU and per order to compute the margin check at checkout. The calculator tells you what your true margin is on average. Agentis tells you whether each individual order clears that margin in real time, before it ships. When inbound freight rates move, when a new tariff hits, when a return-heavy SKU spikes in order mix, the profit floor recomputes and checkout enforcement updates automatically — so the brand never ships a sub-floor order just because the P&L assumption was stale.
The all-in cost of fulfilling an order: product cost, inbound freight, duties, outbound fulfillment, payment processing, and expected return cost. It is the only cost number that accurately reflects what it takes to get a unit into a customer's hands and keep it there.
Because COGS only captures the product itself. Inbound freight, tariffs, fulfillment, returns, and payment processing typically add 15 to 25 percentage points of cost. If you have never modeled these, your quoted margin is almost certainly overstated by double digits.
Quarterly at minimum. Inbound freight rates move, tariffs shift, fulfillment contracts renegotiate, and return rates drift by SKU. Brands that update annually are always operating against stale cost assumptions.
Agentis ingests each of these cost components per SKU and per order via your ERP or Shopify metafields, recomputes true margin per order in real time at checkout, and blocks orders that fall below your profit floor before they ship. The calculator gives you the average; Agentis enforces it per order.
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Free profit margin calculator for ecommerce. Calculate gross margin, net margin, and total profit from revenue, COGS, and operating expenses — with benchmark context.
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Calculate contribution margin per unit, contribution margin percentage, and break-even units. Built for Shopify Plus and DTC brands who need real unit economics.
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Calculate how return rate erodes effective margin. Model return processing costs, restocking recovery, and true margin after returns.
Cost Management
The total cost of a product delivered to the customer, including COGS, freight, duties, tariffs, insurance, and handling fees.
Cost Management
The gradual divergence between the COGS data used in pricing/checkout systems and actual supplier costs, leading to margin miscalculation.
Cost Management
The effect of import duties and trade tariffs on ecommerce product costs, particularly the de minimis threshold changes affecting cross-border commerce.
Margin Analysis
The revenue remaining after deducting all variable costs associated with fulfilling an order — including COGS, shipping, payment processing fees, and pick-and-pack labor.
Gross Margin %
Industry gross margin benchmarks across 8 major ecommerce verticals — health, beauty, fashion, electronics, home, pet, food, and jewelry.
Additional Margin Drag %
Benchmarks for the margin impact of cross-border ecommerce including currency conversion, duties, tariffs, and international shipping.
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