What is the gross margin formula?

Gross margin = ((selling price − unit cost) ÷ selling price) × 100. The absolute version is gross profit = selling price − unit cost. Example: an item sold for $80 with $32 of goods carries $48 of gross profit and a 60 % gross margin. The divisor is the price, never the cost.

Gross profit vs gross margin — what is the difference?

Gross profit is an amount of money, gross margin is that amount as a percentage of the price. An $80 sale with $32 of goods produces $48 of gross profit and a 60 % gross margin. Use the amount to set a ceiling on what one customer may cost, and the percentage to compare products of different prices.

Contribution margin vs gross margin: are they the same?

They coincide when your cost input covers every variable cost. Strictly, gross margin subtracts the cost of goods sold, while contribution margin subtracts all variable costs including variable selling costs such as payment fees and shipping. Include those in the cost field and the figure this calculator returns is the contribution margin per unit.

Is a 50 % markup the same as a 50 % margin?

No, and the gap is where most pricing mistakes start. Markup divides the profit by the cost, margin divides it by the price. A 50 % markup on a $100 item means a $150 price and a 33.3 % margin. Every markup is a larger number than the corresponding margin, so quoting one while planning with the other systematically overstates what you can afford to bid.

Profit Margin Calculator

What one sale actually leaves you: gross margin, profit per unit and the return your campaigns have to clear.

Selling price ($) Price per unit, as the customer pays it Cost per unit ($) Goods, production and other variable costs

Gross margin

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Your room to spend on marketing

Gross profit per unit

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What one sale contributes to ads and overhead

Margin benchmark for ecommerce

0 % 20 % 40 % 60 % ≥70 %

< 20 % critical 40 % workable 60 %+ strong

Now you know your margin

Turn it straight into the ceilings it implies: your break even ROAS, your highest defensible CPA and CPC.

Open the Break Even ROAS calculator

Margin sensitivity

Gross margin Current

Break even ROAS at this margin

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The curve holds the selling price steady and varies the unit cost, so you can see how much margin a supplier negotiation actually buys — or costs.

What is gross margin, and why every bid ceiling starts here

Gross margin is the share of a sale that survives the variable costs — goods, production, shipping. Whatever is left has to cover fixed costs, advertising and profit, in that order, which is why this single number decides how much room you have to bid at all. It also fixes your break even ROAS: at a 50 % margin a campaign has to return 2x before it stops losing money, at 25 % it has to return 4x. This calculator reports the profit margin on one product, so you get a per-unit figure rather than a company-wide one — and where your cost input covers every variable cost, the absolute amount is what cost accounting calls the contribution margin.

The profit margin formula, and the divisor people get wrong

Two numbers go in — what you sell the item for, and what the item costs you. The difference between them is divided by the price:

Profit margin = ((price − unit cost) ÷ price) × 100

Divide by the cost instead and you get markup — a different figure, and always the flattering one. An item that costs $32 and sells for $80 carries a 150 % markup but a 60 % margin. Both are arithmetically correct; only the margin tells you what you can afford to spend winning the sale, which is why every ceiling on this site is built on it.

How to calculate profit margin on a single product

An item sells for $80 and the goods cost $32:

Selling price$80

Cost of goods$32

Gross profit = 80 − 32 = $48

Profit margin = 48 ÷ 80 × 100 = 60 %

Break even ROAS = 1 ÷ 0.60 = 1.67x

A 60 % margin is a comfortable starting position: campaigns only have to return 1.67x to break even, against 3.33x at a 30 % margin. That same $48 is also the most a new customer may cost you before the sale stops paying for itself.

What is a good profit margin when you advertise the product

For a product you intend to run paid traffic against, three bands matter more than any industry average:

Critical — paid marketing barely works < 20 %

Solid — enough room for Shopping and Meta 35–50 %

Strong — good conditions for scaling 60 %+

The bands come straight from the arithmetic rather than from any benchmark study: break even ROAS is 1 ÷ margin, so 20 % demands 5x, 40 % demands 2.5x and 60 % only 1.67x. Below roughly 20 % there is no channel that reliably returns what the product needs. Software and digital goods routinely reach 70–85 %, which is why they can outbid physical retail for the same click.

Gross margin vs net margin: where the rest of your costs go

This calculator stops at the variable costs, and that is deliberate — but it means the number above is not your profit at the end of the year. Gross margin subtracts goods, production and shipping. Net margin goes on to subtract rent, salaries, software, and the advertising spend itself, which is why a shop with a healthy 55 % gross margin can still finish the year at 4 % net. The two answer different questions: net margin tells you whether the business works, gross margin tells you what you may spend to win one more sale. For bidding decisions the gross figure is the right one, because advertising is paid out of it rather than counted inside it — feeding a net margin into a break even ROAS would deduct your ad spend twice.

How to increase profit margin — and what each point buys in bidding room

Raise the price: the most direct lever, and the one with the least work behind it. At a $32 unit cost, moving from $80 to $88 lifts the margin from 60 % to 63.6 % and drops the break even ROAS from 1.67x to 1.57x — provided demand holds, which is the whole question.
Cut what the goods cost: volume terms, a second supplier, lighter packaging. Every dollar saved here lands entirely in the margin, and unlike a price rise it costs you no conversions.
Advertise the right products: margin varies by item, and the campaign inherits the margin of what it sells. Pushing traffic at low-margin lines drags the whole account below its own break even point while every dashboard still looks busy.

Frequently asked questions

What is the gross margin formula?: Gross margin = ((selling price − unit cost) ÷ selling price) × 100. The absolute version is gross profit = selling price − unit cost. Example: an item sold for $80 with $32 of goods carries $48 of gross profit and a 60 % gross margin. The divisor is the price, never the cost.
Gross profit vs gross margin — what is the difference?: Gross profit is an amount of money, gross margin is that amount as a percentage of the price. An $80 sale with $32 of goods produces $48 of gross profit and a 60 % gross margin. Use the amount to set a ceiling on what one customer may cost, and the percentage to compare products of different prices.
Contribution margin vs gross margin: are they the same?: They coincide when your cost input covers every variable cost. Strictly, gross margin subtracts the cost of goods sold, while contribution margin subtracts all variable costs including variable selling costs such as payment fees and shipping. Include those in the cost field and the figure this calculator returns is the contribution margin per unit.
Is a 50 % markup the same as a 50 % margin?: No, and the gap is where most pricing mistakes start. Markup divides the profit by the cost, margin divides it by the price. A 50 % markup on a $100 item means a $150 price and a 33.3 % margin. Every markup is a larger number than the corresponding margin, so quoting one while planning with the other systematically overstates what you can afford to bid.