Break-Even ROAS: How to Calculate It (and Why Retention Lowers It)

Break-even ROAS is the return on ad spend at which a sale from your ads makes exactly zero profit. You calculate it as 1 ÷ your contribution margin ratio before ad spend. For example, if an order leaves you 55% after product, shipping and payment costs, your break-even ROAS is 1 ÷ 0.55 = 1.82. Below that, every sale from your ads loses money on the first order.

Most brands know their ROAS.

Far fewer know the number it has to beat.

A 2.5 ROAS sounds great. Until you find out your break-even ROAS is 3.33.

Here's how to calculate break-even ROAS, which ROAS to compare it with and why the brands that scale ads profitably usually fix their back end first.

By Emiel Dingemans, Founder of Magicianly

Updated October 2026

What Is Break-Even ROAS?

Break-even ROAS is the minimum return on ad spend you need to cover the costs of a sale. Nothing left over, nothing lost.

ROAS itself is simple: revenue from ads divided by ad spend. A ROAS of 3 means $3 in revenue for every $1 you spend on ads.

But revenue isn't profit. Out of that $3, you still pay for the product, the shipping and the payment fees.

Break-even ROAS tells you where the line sits for your margins. Above it, the first order makes money. Below it, you're paying to sell.

Some tools show ROAS as a percentage. A ROAS of 1.82 is the same as 182%.

What Is the Break-Even ROAS Formula?

Break-even ROAS = 1 ÷ contribution margin ratio (before ad spend)

Or, per order:

Break-even ROAS = average order value ÷ contribution margin per order

Both give you the same answer.

Your contribution margin ratio is the share of revenue that's left after variable costs. For an ecommerce brand, those usually include:

• cost of goods sold;
• shipping and fulfillment, including packaging;
• payment processing fees.

Leave ad spend out of this step. Ad spend is what you're solving for.

Don't have the number yet? Here's how to calculate your contribution margin.

How Do You Calculate Break-Even ROAS?

Work out what one average order leaves you before ads. Then divide the order value by that amount.

Example:

1. 1Average order value, after discounts: $100
2. 2Cost of goods sold: $30
3. 3Shipping and fulfillment: $12
4. 4Payment processing fees: $3
5. 5Contribution margin before ad spend: $100 minus $45 = $55, or 55%

Break-even ROAS: $100 ÷ $55 = 1.82

So in this example, your ads need to bring in at least $1.82 in revenue for every $1 you spend, just to break even on the first order.

The same math gives you your break-even cost per acquisition: $55. That's the most you can spend in ads to get one order before that order loses money.

What's the Break-Even ROAS for Your Margin?

If you know your contribution margin ratio before ad spend, you can read your break-even ROAS straight from this table.

The lower your margin, the faster the number climbs.

A brand that keeps 25% of every order needs twice the ROAS of a brand that keeps 50%. Same ads, same traffic, very different business.

What's the Difference Between Break-Even ROAS and Target ROAS?

Break-even ROAS is where your ads make zero profit. Target ROAS is where they make the profit you actually want.

To find it, take the profit you want to keep off your margin before you divide:

Target ROAS = 1 ÷ (contribution margin ratio minus target profit margin)

Example: a 55% margin and a goal of keeping 15% of revenue as profit after ads.

1 ÷ (0.55 minus 0.15) = 1 ÷ 0.40 = 2.50

So 2.50 is the number to aim for, and 1.82 is the floor. Anything in between still makes money, just less than you planned.

There's no universal good ROAS. A ROAS of 3 is profitable at a 50% margin and loses money at a 25% margin. A good ROAS is one that sits comfortably above your own break-even ROAS.

Which ROAS Should You Compare With Your Break-Even ROAS?

The ROAS from your own store data. Not the one an ad platform reports on its own.

Every platform counts conversions by its own attribution rules. Meta and Google can both claim the same order, so if you add up platform ROAS you usually end up with more revenue than your store actually made.

Platform ROAS can also include returning customers who would have bought anyway. That flatters the number.

For the first-order check, we look at:

• revenue from new customers only, from your store data;
• divided by your total ad spend across every platform.

If that number sits above your break-even ROAS, your first orders pay for your ads. If it sits below, they don't, and you need to know how fast your customers come back.

Use platform ROAS to optimize inside a channel. Don't use it to judge the business. The same goes for the revenue your email platform reports, which is why we read Klaviyo attribution carefully too.

Do You Need to Be Profitable on the First Order?

Not necessarily.

On most ecommerce brands, the first order barely covers its own costs once you pay for the ad, the product, the shipping and the fees. The profit lives in order two, three and four.

That's why brands that scale are often willing to break even, or even lose a little, on the first purchase. They know their back end will make the customer profitable later.

That only works if two things are true:

1. 1Customers actually come back, and you can see it in your cohort data.
2. 2They come back fast enough for your cash flow.

If you run below break-even on the first order without a retention system behind it, you're not investing in growth. You're buying revenue at a loss.

If your entire business depends on the winning ad auction tomorrow, you don't have a business. You have a gamble.

How Do You Calculate Break-Even ROAS With Repeat Purchases?

Use the contribution margin a new customer leaves within a set window, like 90 days, instead of the first order alone.

Back to the example. The first order leaves $55.

Now say your cohort data shows that new customers leave $85 in contribution margin on average within 90 days of their first order, repeat purchases included.

You could then spend up to $85 in ads to acquire a customer and still break even within 90 days. Measured against the first order of $100:

90-day break-even ROAS: $100 ÷ $85 = 1.18

So your first-order break-even ROAS is 1.82, but your 90-day break-even ROAS is 1.18. That gap is what your retention is worth in paid media terms.

A few things to keep in mind:

• Pick a window your cash flow can carry. Breaking even within 90 days is a very different business from breaking even within 12 months.
• Read cohort numbers in contribution margin, not revenue.
• Only use a window you can actually see in your own data.

Here's how we read customer lifetime value by cohort, and how it connects to your customer acquisition cost.

How Does Retention Lower Your Break-Even ROAS?

It makes every new customer worth more, so the same ads can earn back more. And it raises the ROAS you actually get, because you convert more of the traffic you already paid for.

We've seen this with a high-AOV brand we work with. They were only able to scale their ads after their email and SMS system was fixed. Their break-even ROAS dropped significantly, and that's what let them scale paid ads in a profitable way.

Here are the four levers we work on.

1. Make the first order worth more, without a discount

Some costs come with every order, like shipping and fulfillment, no matter how much is in the cart. Spread over a bigger order, they take a smaller share. Your margin goes up and your break-even ROAS goes down.

Bundles and smart free shipping thresholds usually do more here than another discount. Here's how we raise average order value.

2. Know what your first-order discount does to the math

Discounts raise your break-even ROAS fast.

Take the same $100 order with 20% off. Revenue drops to $80. Keep the other costs the same for simplicity, and your margin falls from $55 to $35.

Break-even ROAS: $80 ÷ $35 = 2.29

One discount moved your floor from 1.82 to 2.29.

That doesn't mean you should never offer a welcome discount. It means you should know what it costs, and not stack more discounts on top of it.

3. Capture the visitors you already paid for

Most of the visitors you pay for leave without buying. A strong signup form gives you a way to follow up without paying for that click again. For most brands, we want to see a signup rate in the 6 to 12% range.

Then a front-loaded welcome series turns those subscribers into first-time buyers. Same ad spend, more new customers, a higher real ROAS.

4. Go after the second purchase early

The sooner customers buy again, the sooner they cover what you paid to acquire them.

A post-purchase flow that helps customers get results with what they bought, then offers the product that goes with it around 20 to 40 days after the first order, does a lot of that work. If they bought the coffee, offer the frother.

Why Isn't Break-Even ROAS Enough on Its Own?

Because it's a first-order number. It tells you whether your ads pay back on the first purchase, not whether the business is healthy.

We read it next to four other metrics:

1. 1Contribution margin after marketing, to see whether growth is actually profitable.
2. 2Blended customer acquisition cost: all marketing spend divided by all new customers.
3. 3Cohort LTV at 30, 60 and 90 days, in contribution margin.
4. 4Your repeat purchase rate, especially from first to second order.

Here's how these fit together in our ecommerce retention metrics, and how retention improves profitability without more ad spend.

So How Should You Use Break-Even ROAS?

• Calculate it as 1 ÷ your contribution margin ratio before ad spend, or average order value ÷ contribution margin per order.
• Set a target ROAS above it that leaves the profit you want.
• Compare it with new-customer revenue from your store data divided by total ad spend, not with platform ROAS.
• Know your 90-day break-even ROAS too, from your own cohort data.
• Lower it by raising order value, being careful with discounts, capturing the visitors you paid for and getting the second purchase sooner.

Better ads raise your ROAS. A better back end lowers the ROAS you need.

The brands that scale profitably work on both.