Know your break-even ROAS before you spend another dollar on Google

If you run Google Ads, you have been asked a strange question: what target ROAS do you want? ROAS means return on ad spend, the sales you get back for each dollar of ads. Most people guess. Some pick 400% because it sounds healthy.

This week a small change showed up that makes the guess harder to excuse: a calculator that asks for your profit margin and hands back the break-even target. The feature is small. The idea behind it is the most useful thing in this week's news.

What happened

On October 9, PPC News Feed reported that Google Ads now calculates a target ROAS from your profit margin. The report is based on a LinkedIn post by a practitioner, Arpan Banerjee, who shared screenshots from inside an account. We found no Google announcement or help page that mentions it, so treat it as something practitioners have seen in the interface, not a confirmed launch.

Here is what the report describes:

You type in your "average profit margin excluding ad spend."
The tool works out the break-even target ROAS. In the example shown, a 15% margin gives a target of 667%.
It estimates weekly clicks, revenue, ad spend and profit at the target you pick.
A button, "Use this target ROAS," applies the number to a campaign.

667%Break-even target ROAS at a 15% margin, in the reported example

500%Target in Google's own example: $5 in sales for every $1 of ads

15Conversions in 30 days Google lists before target ROAS can run on Search

Source: PPC News Feed, October 9, 2026; Google Ads Help, About Target ROAS bidding

The math is one line

You do not need to wait for the button. Break-even ROAS is one divided by your margin.

If you keep 15 cents of profit on every dollar of sales, before ads, you can spend 15 cents on ads to make that dollar and end up even. One dollar divided by 15 cents is 6.67, which Google shows as 667%. Spend more and you lose money on the sale.

Google's own help page defines target ROAS the same way: "the average conversion value (for example, revenue) you'd like to get for each dollar you spend on ads." Its example is a shoe store that wants $5 in sales for each $1 in ads, a 500% target. That store is only breaking even if its margin is 20%.

Here is the same arithmetic across common margins. These are not benchmarks. They are just one divided by the margin.

Your profit margin before ads	Break-even target ROAS	Most you can spend on ads per $100 of sales
10%	1,000%	$10
15%	667%	$15
20%	500%	$20
25%	400%	$25
33%	300%	$33
40%	250%	$40
50%	200%	$50
60%	167%	$60

A thin margin needs a high ROAS just to stand still. The 400% you picked because it sounded healthy may be losing money on every sale.

A retailer selling products it buys wholesale may need a very high ROAS just to stand still. A salon selling a service can break even at a much lower number. Same Google, very different targets.

What it means for your business

Break-even is the floor, not the goal. Your real target sits above it, by however much profit you want each sale to carry.

Be careful what you call margin. The calculator asks for margin excluding ad spend. That means price minus what the product or the labor costs you, minus shipping you absorb, payment fees and anything else you pay on each sale. Use a rosier number and you will set a target that is too low. Your bookkeeper can give you the real one. This is not accounting advice, just the order of operations.

Target ROAS also needs values. Google says you must set values for the conversions you track, and it requires at least 15 conversions in the past 30 days for Search and Shopping. A plumber or dental office that counts calls but never puts a dollar value on them cannot use this math yet. The real homework: decide what a lead is worth.

What Google can calculate

The ROAS needed to break even once you hand it a margin. Estimated clicks, revenue and spend at that target. A button to apply it.

What only you know

Your true margin after the costs Google never sees. What a lead or a booking is worth to you. How much profit each sale has to carry. Whether a first sale turns into a regular customer.

One caution: Google treats target ROAS as an average across the traffic it buys, not a floor on every sale. Some sales will land below your target. Build a cushion into the number.

A shop counter with a balance scale, coins stacked on one pan and a paper receipt on the other, a magenta marker at the level point, with a ledger and a pencil beside it — Break-even is where the scale levels out. Every target you set should sit on the profit side of it.

What to do this week

Find your real margin
Ask your bookkeeper for profit per sale before ads: price minus the cost of the product or the labor, shipping, fees and anything else you pay each time.
Divide one by it
That is your break-even ROAS. Write it down next to your current target and see which side you are on.
Pick a profit target above it
Decide how much profit each sale must carry, then set target ROAS from that number, not from a guess.
Put a value on your leads
If you sell by phone or form, estimate what an average lead is worth from your close rate and average sale, and give your conversions that value.
Check your campaigns against it
Look at the last 30 days. Any campaign running below your break-even ROAS is costing you money on every sale it brings in.

If the calculator appears in your account, use it to check your math. It is only as honest as the margin you type.

For a lead business, the same discipline applies to cost per lead. We wrote about how to read that number honestly in reading cost per lead without fooling yourself.

This is part of What You Missed, our weekly read on the marketing news that matters to business owners. See the full week: /blog/what-you-missed-week-of-october-5-2026

Sources

PPC News Feed, "Google Ads Calculates Target ROAS from Profit Margin," October 9, 2026, based on a LinkedIn post by Arpan Banerjee. ppcnewsfeed.com
Google Ads Help, "About Target ROAS bidding," checked October 11, 2026. support.google.com