Ecommerce Profit Margin Calculator

Gross margin vs net margin, and when each one matters

Both numbers above answer different questions, and using the wrong one is how a product that looks profitable quietly loses money.

Gross margin is what is left after the cost of the product itself: (selling price - cost price) / selling price. It answers a pricing question. It tells you whether the product is priced high enough above what it costs to make or buy, and it is the number to look at when you are setting a price, negotiating with a supplier, or deciding whether a SKU deserves shelf space at all.

Net margin is what is left after everything else: shipping, payment processing, advertising, and eventually overhead and tax. It answers a viability question. It tells you whether you are actually making money on the sale as it really happens, ads included, which is why it is the number that decides how hard you can push acquisition.

The practical rule: use gross margin to set the price, use net margin to decide whether to spend. A 60% gross margin sounds comfortable until $18 of ad spend per unit turns it into a 4% net margin, and at that point one returns spike or one shipping-rate rise puts the product underwater.

What belongs in cost of goods sold, and what does not

COGS is the most commonly misfilled field on this calculator, and getting it wrong distorts every number downstream. The test is simple: does this cost exist because of this one unit?

Belongs in COGS

• The unit price from your supplier, or the manufacturing cost if you produce it
• Inbound freight and import duty, divided across the units in the shipment
• Per-unit packaging: the box, the insert, the label
• Any per-unit assembly, kitting or finishing labour

Does not belong in COGS

• Marketing and ad spend, which is why this calculator gives it its own field
• Salaries, contractors and agency retainers
• Software, rent, and everything else you would still pay if you sold nothing this month
• Outbound shipping and payment processing, which scale with the order rather than the unit and get their own treatment below

The failure mode is folding operating costs into COGS, which understates gross margin and makes a perfectly viable product look like it should be discontinued. The opposite mistake, leaving freight and duty out, is more common and more dangerous: it inflates gross margin by several points and hides the fact that the landed cost is far above the invoice price.

How to treat shipping and payment processing

These two costs are the ones most often forgotten, and together they routinely take a bigger bite than founders expect.

Shipping

Use your true blended cost per unit, not your carrier's headline rate. That means the label, the fulfilment pick-and-pack fee if a third party ships for you, and the part you absorb when you offer free delivery. If you run free shipping over a threshold, the honest input is the average subsidy across all orders rather than zero. Returns belong here too: a 10% return rate on a product where you eat the return label is a real per-unit cost, and leaving it out is the single most common reason a modelled margin does not match the bank account.

Payment processing

Processing is charged as a percentage plus a fixed fee per transaction, and the fixed part is what hurts on low-priced items. In the US the common online card rate is around 2.9% plus roughly 30 cents; rates differ by region, by card type, and by the plan you are on, and using a third-party gateway inside a hosted platform can add a further surcharge on top. Look up your own current rate rather than trusting a figure from a blog, including this one, because it is the one cost here you can read exactly off your last statement. On a $15 product the fixed 30 cents alone is 2% of revenue, which is why cheap SKUs need a different margin target than expensive ones.

What a healthy ecommerce margin actually looks like

Gross margin is the one with a defensible benchmark. Across the latest 10-K filings of 11 publicly traded direct-to-consumer and CPG brands, including Warby Parker, e.l.f. Beauty, Revolve, Yeti and Lululemon, the median gross margin is 56.6%, with the 25th to 75th percentile running 45.6% to 63.8%. Category moves that number more than competence does: beauty and personal care sit at the top of the range, supplements and health in the middle, and apparel lower once returns are counted.

Net margin is different, and it is worth being straight about it. Published net-margin benchmarks for DTC are thin and often contradict each other, so treat any single figure you are quoted with suspicion. What is structurally true is that net lands a long way below gross for everybody, because fulfilment, processing, advertising, overhead and tax all come out of that gap, and that acquisition cost is usually the largest single item in it. Rather than chasing an industry number, use this calculator on your own real costs and read the break-even ROAS it gives you.

The useful way to read your gross margin is as a ceiling on ambition. Below roughly 40% there is very little room to buy traffic at all, and growth has to come from organic demand, retention or a price rise. Above 60% you can afford to test paid acquisition properly and absorb the losing tests that testing requires.

A worked example

Take a skincare product that retails at $45 and costs $12 landed, with $6 per unit of blended shipping and fulfilment and $9 per unit of ad spend.

• Gross margin: (45 - 12) / 45 = 73%. Comfortably above the 56.6% public median, so the pricing is sound.
• Profit per unit before ads: 45 - 12 - 6 = $27, once shipping is counted.
• Processing: roughly 2.9% of $45 plus 30 cents, about $1.61, leaving $25.39.
• Profit per unit after ads: 25.39 - 9 = $16.39, a net margin of about 36%.
• Break-even ROAS: the product can absorb up to $25.39 of ad spend per unit before it stops making money, so break-even sits at 45 / 25.39, about 1.8x. At $9 spend per unit the actual ROAS is 5x, which is a healthy gap.

Now change one input. Drop the price to $25 and keep every cost the same: gross margin falls to 52%, profit after shipping and processing is $5.97, and a $9 ad spend per unit puts the product just over $3 underwater on every sale. Same product, same costs, and the difference between a good business and a loss is entirely in the price. That is the sensitivity the calculator exists to expose, and it is worth re-running whenever a supplier price or a shipping rate moves.

Break-even ROAS: turning margin into an ad-spend ceiling

Break-even ROAS is the number that connects this calculator to your ad account. It is the minimum return you need before spending stops adding profit, and it falls straight out of your margin: the more of the selling price your costs consume, the higher the return you need from every dollar of spend.

Once you know it, two things follow. It becomes the kill threshold for a campaign, because a creative running below break-even is not underperforming, it is losing money. And it sets how much testing you can afford, since the gap between your break-even and your actual return is your testing budget. Work out the spend side with the ROAS calculator, check what a customer is worth over their whole relationship with the customer lifetime value calculator, since a repeat-purchase product can justify a first-order loss that a one-off product cannot, and if the conversion rate is the constraint rather than the margin, the conversion rate calculator shows what a small lift is worth.