What Is the Break-Even Point? How to Calculate It in E-Commerce

The break-even point is the level at which a business makes neither profit nor loss — where total revenue exactly equals total cost. In e-commerce we express it two ways: how many units you must sell to cover your fixed costs (the break-even units), and the revenue that corresponds to it (the break-even revenue). In this article we build the concept from scratch: we separate fixed and variable costs, derive the unit contribution margin, place the marketplace commission where it belongs, and calculate it with concrete numbers from a single product up to the whole store.

What is the break-even point?

The break-even point is the threshold where revenues fully cover costs and profit is zero. Below this point you make a loss; above it, profit begins. It is called a threshold because the situation flips on either side — not the line where each individual product’s profit changes sign, but the line where the total of the whole business nets to zero.

The key point: break-even is determined not by product cost alone, but by two different types of cost working together. Without making this distinction, a correct break-even calculation is impossible.

The difference between fixed and variable costs

Fixed costs occur every month (or period) regardless of how many units you sell. You pay them at zero sales, and they stay largely the same at a thousand units. Typical fixed costs in e-commerce:

• Accountant / financial advisor fee
• Warehouse or office rent
• Fixed staff salaries
• Software/panel subscriptions (integration, profit tracking, design tools)
• A committed fixed advertising budget (if it does not vary per unit)

Variable costs, on the other hand, occur with each unit sold — they depend on quantity. Sell one more and one more unit’s worth is added; sell none and none occur. Typical variable costs in e-commerce:

• Product purchase/production cost (cost of goods)
• Marketplace commission (a percentage of the sale amount)
• Shipping and delivery fee
• Packaging materials
• Transaction/payment and any service fees
• The per-unit share of your average return cost

Short rule: a fixed cost arises with time, independent of units (rent, accounting). A variable cost arises with a sale and repeats on every unit (goods, commission, shipping). If you cannot decide which bucket a cost goes in, ask: “If I sold nothing today, would this cost still occur?” If yes, it is fixed; if no, it is variable.

Unit contribution margin: the engine of break-even

The key concept that unlocks break-even is the unit contribution margin. It is what remains after you subtract a product’s variable cost from its selling price:

Unit contribution margin = Selling price − Unit variable cost

The reason it is called “contribution” is precise: after covering its own variable cost, each unit sold uses what is left to contribute to paying the fixed costs. Once the fixed costs are fully covered, any further contribution margin turns directly into profit. So break-even answers the question: “When does the contribution margin from each unit sold cover the total fixed cost?”

Deriving a product’s variable cost step by step

Suppose you sell a product on a marketplace for 200 TL. Let us add up the variable cost items one by one:

• Cost of goods (purchase): 90 TL
• Marketplace commission (15% → 200 × 0.15): 30 TL
• Shipping: 35 TL
• Packaging: 5 TL

Total unit variable cost: 90 + 30 + 35 + 5 = 160 TL. So the unit contribution margin is: 200 − 160 = 40 TL. That is, each unit you sell of this product contributes 40 TL toward paying your fixed costs. Adding up variable cost correctly is the most sensitive step of break-even; to break costs down per product, you can use the product cost calculator.

Why is marketplace commission a variable cost?

The point new sellers miss most: commission is not fixed, it is a variable cost. Because it is taken as a percentage of the sale amount — sell one more and you pay commission once more. That is why commission goes into the unit contribution margin, not the fixed-cost side of the break-even formula.

There is one more subtlety: on most marketplaces a separate 20% VAT is added on top of the commission (Trendyol is the exception here; it calculates commission from the VAT-inclusive price and adds no VAT on top). If VAT is stacked on commission, you must record not 30 TL but 30 × 1.20 = 36 TL as variable cost — which lowers the contribution margin and raises the break-even units. To see the full effect of commission on profit, see the profit margin calculator.

How to calculate break-even units

Once you have the contribution margin, break-even units follow from a single division:

Break-even units = Total fixed cost ÷ Unit contribution margin

The logic is simple: each product supports the fixed cost by its contribution margin; divide the total fixed cost by this contribution and you find how many units cover the fixed cost entirely. Everything beyond that is profit.

Concrete example: monthly break-even

We found the unit contribution margin of the product above to be 40 TL. Say your monthly fixed costs are:

• Financial advisor: 2,000 TL
• Panel/software subscriptions: 1,000 TL
• Warehouse rent and fixed costs: 5,000 TL

Total fixed cost: 8,000 TL. Break-even units: 8,000 ÷ 40 = 200 units. So selling 200 units of this product a month leaves you with neither profit nor loss; you fully cover your fixed costs. From the 201st unit on, each sale leaves 40 TL of net contribution in your pocket.

You can find the break-even revenue two ways. Directly: 200 units × 200 TL = 40,000 TL. Or by formula:

Break-even revenue = Total fixed cost ÷ Contribution margin ratio

Here the contribution margin ratio = unit contribution margin ÷ selling price = 40 ÷ 200 = 20%. From this: 8,000 ÷ 0.20 = 40,000 TL. Both paths give the same result. The contribution margin ratio is especially useful in multi-product stores with different prices, because you compute break-even revenue over an average contribution ratio instead of unit by unit.

Instead of doing these divisions by hand over and over, enter your fixed cost, selling price, and unit variable cost into the break-even point calculator and get the break-even units and revenue instantly, plus “if I sell this many, I earn this much” scenarios on top.

Break-even in a multi-product store

If you do not sell a single product, you build break-even not product by product but over a weighted average contribution margin ratio. The steps:

1. Compute each product’s contribution margin ratio (unit contribution ÷ price).
2. Find the weighted average contribution ratio based on each product’s share of revenue.
3. Divide the total fixed cost by this average ratio → store-wide break-even revenue.

Example: product A makes up 70% of my revenue with a 20% contribution ratio; product B makes up 30% with a 30% ratio. Weighted average: (0.70 × 20%) + (0.30 × 30%) = 14% + 9% = 23%. If the monthly fixed cost is 8,000 TL, break-even revenue is: 8,000 ÷ 0.23 ≈ 34,783 TL. When your product mix shifts — that is, when the share of the lower-contribution product rises — the average ratio falls and your break-even revenue rises. So think of break-even not as a fixed number but as a target sensitive to your sales mix. As your mix changes, you can quickly test where the target moves with the break-even point calculator.

How does break-even help with new-product and campaign decisions?

Break-even is not just the answer to “am I avoiding a loss?”; it is a decision tool. It helps directly in two typical scenarios.

New product launch

When adding a new product to your catalog, the question is not “is the margin good?” The right question is: “Can I reach the volume that covers the fixed-cost share this product must carry?” If a product with a 40 TL contribution margin means 200 units a month at break-even, and your realistic sales estimate in that category is 80 units a month, then that product cannot cover its fixed cost on its own. You either raise the contribution margin by changing price/cost, revisit your volume expectation, or evaluate it together with other products that share the fixed-cost burden.

Campaign and discount decisions

A discount lowers the price and therefore directly shrinks the contribution margin, pushing the break-even units up. A 10% discount on the 200 TL product pulls the price to 180 TL. Since commission is also a percentage of the sale amount, it drops to 180 × 15% = 27 TL; but goods, shipping, and packaging (90 + 35 + 5 = 130 TL) stay the same. New variable cost: 130 + 27 = 157 TL. New contribution margin: 180 − 157 = 23 TL. New break-even units: 8,000 ÷ 23 ≈ 348 units. So a mere 10% discount raised the break-even target from 200 units to about 348 units — a 74% jump. You should make the discount decision not on the feeling that “sales will rise,” but on whether you can truly do this extra volume. To try campaign scenarios, use the campaign discount calculator to see the discounted price’s effect on contribution and break-even in advance.

What if contribution margin is zero or negative?

The most critical warning: if the unit contribution margin is zero or below zero, there is no break-even point — the math collapses. Because in break-even units = fixed cost ÷ contribution margin, as the denominator approaches zero the result goes to infinity, and if it turns negative the result becomes meaningless.

The practical meaning is clear: if every product you sell does not even cover its own variable cost (price < variable cost), the more you sell, the more you lose. Volume will not save you, it will sink you. In the example, if a campaign pulled the price down to 150 TL, since the variable cost is 160 TL (even more with VAT-inclusive commission), the contribution margin would be −10 TL; every sale would cost you 10 TL out of pocket. In such a case, in order:

• Raise the price or pull back the discount (move the contribution margin positive).
• Lower the variable cost (cheaper shipping, better purchasing, a lower-commission channel).
• If none work, stop selling that product — because as volume grows, the loss grows.

That is why, before looking at break-even, always verify that the contribution margin is positive. If it is not, calculating break-even units has no meaning whatsoever.

Three reminders for using break-even correctly

1. Put it in the right bucket: commission, shipping, and cost of goods are variable → they go into the contribution margin. Rent, accounting, and subscriptions are fixed → they are the numerator of the break-even division. Mix them and the result is wrong.
2. Don’t forget commission VAT: if 20% VAT is stacked on commission, record the variable cost accordingly; otherwise you will see the contribution margin too high and break-even too low.
3. Break-even is a target, not a guarantee: the unit count tells you how much you must sell; it does not tell you that you can reach that volume. Evaluate that separately in launch and campaign decisions.

Don’t memorize break-even — let the system track it

The break-even point is the most fundamental math showing the profit–loss boundary in e-commerce: separate fixed from variable, derive the unit contribution margin, divide fixed cost by contribution. But in real life variable costs move on every order — commission changes, shipping shifts by desi, the return rate quietly eats the contribution margin. Verimle, once you track your sales, reads the real deductions of every order from the breakdown and derives the contribution margin and net profit per product; so you keep your break-even current with actual figures, not guesses. Instead of chasing the formula by hand every month, let the system show you which product covers its fixed cost and which stays below break-even.

A note: the break-even examples here (200 TL price, 15% commission, 8,000 TL fixed cost) are only illustrative; your own break-even point changes according to your own cost, commission, and deduction figures. To calculate with your own real numbers, use the break-even point calculator. This guide was reviewed on 18 July 2026.