Target CPA vs Target ROAS: which one actually fits how your business makes money

Search for Target CPA vs Target ROAS and you'll get a dozen articles that define both terms cleanly, maybe with a comparison table, and then leave you to figure out which one to actually turn on. That's not a small gap. Picking the wrong one doesn't just underperform, it optimises your account toward the wrong outcome on purpose, because you told the algorithm to.

This article skips the dictionary definitions and goes straight to the decision: what does each strategy actually optimise for, which one matches how your specific business makes money, and what has changed recently enough that the answer you were given a year ago may no longer hold.

One piece of housekeeping first, because it confuses every comparison written before this year. Google states that from June 2026 it is relabelling these strategies: 'Maximise conversions with a Target CPA' becomes 'Target CPA', and 'Maximise conversion value with a Target ROAS' becomes 'Target ROAS'. It also says you may see a mix of naming conventions during the rollout, that the Google Ads API, Editor and mobile app will not show the new names immediately, and that whichever label you are looking at, 'they function in the exact same way'. If two reports name the strategy differently, that is why, and nothing about the bidding changed.

Target CPA is, in Google's description, an automated bid strategy that sets bids for you to get as many conversions or customer actions as possible, where you set your desired average cost per conversion and Google Ads sets a bid based on how likely the ad is to convert. The part that matters for the decision is how it treats the conversions it buys. In the table on Google's Target ROAS page for choosing between the four Smart Bidding strategies, Target CPA sits under the line 'All conversions are treated equally'. It does not know or care whether one converting customer spent twenty pounds and another spent two thousand. Every conversion counts the same toward the goal.

Target ROAS is a different instruction. Google describes it as predicting the value of a potential conversion on every search and adjusting bids to maximise the return on them: bidding high where a search looks likely to generate a high value conversion, and low where it does not. That prediction has to be fed. Google's stated prerequisite is that before you can apply the strategy you'll need to set values for the conversions that you're tracking, and its table puts Target ROAS under 'Conversions have different values for your business'. Given real values it is optimising for value relative to spend rather than for volume, so it will pay more for the searches its prediction rates highly and less for the rest. Google does not say the conversion count falls, and it need not: what changes is which conversions the money goes to.

One asymmetry catches people migrating between the two. Under Target CPA, Google says device bid adjustments 'modify the value of your CPA target, rather than the bids themselves', and says that for the best performance you may want to remove your manual CPC bid adjustments when you switch. Under Target ROAS, Google says your existing bid adjustments 'aren't used' at all, with a single exception: you can still set a device bid adjustment of minus 100%. It also notes that you do not need to remove the others, they just will not be used. So they stay in the account doing nothing.

Most comparisons present this as a pure judgement call. For Target ROAS, part of it is a published requirement. Google's page for the strategy lists a conversion volume floor across seven requirement lines covering eight campaign types, and the whole list is worth having: Search and Shopping need at least 15 conversions in the past 30 days at the conversion tracking level; Display needs 15 with valid conversion values in the past 30 days across all of your campaigns combined, although Google says new Display campaigns no longer require a history of conversions; App campaigns need 10 every day, or 300 in 30 days; Demand Gen needs 50 in the past 35 days with 10 of them in the past seven days in the campaign, or 100 in the past 35 days across all Demand Gen campaigns in the account; video action campaigns 30 in the past 30 days; Hotel campaigns 50 per week at a campaign level; Travel campaigns 50 in the past seven days at a campaign level. Two notes worth reading where they sit rather than where they are usually quoted. Beside the Demand Gen figure, Google adds that conversions must have a value greater than 0 to be counted as eligible, and that eligible campaigns are automatically allowlisted. It is the Display line, separately, that carries its own qualifier of valid conversion values. Neither is written as a rule over the whole list, and this page is not going to widen them into one. Performance Max, meanwhile, has no line at all, although the same page treats it as a Target ROAS campaign type elsewhere, so if that is what you run, the floor for it is not published here.

Read the level each of those is stated at, because it differs and almost nothing repeating the threshold says so. Google attaches the Search and Shopping figure to the conversion tracking level, the Display figure to all of your campaigns combined, and the Hotel and Travel figures to a campaign, while Demand Gen is given at two levels at once: the lower figure in the campaign, the higher one across every Demand Gen campaign in the account. So there is no single answer to 'do we have enough conversions', only an answer for the campaign type you are on, at the level Google names for it, where it names one: the App and video action lines carry a figure and no level at all. Before accepting any version of this threshold, including a per campaign one, check which line of that list it came from.

Target CPA carries no equivalent volume requirement. Google says advertisers can start using Target CPA with no conversion history, and that it is effective for campaigns of all sizes. It does still require conversion tracking to be set up first, which both strategies do. So the honest version of the comparison is not that one strategy is more advanced than the other. It is that one has a published bar and the other does not, that the bar is a conversion count rather than a judgement, and that which count applies to you depends on your campaign type and is read at a level Google names line by line. One caveat on how hard that bar is, because Google's two pages do not frame it the same way. The Target ROAS page introduces the list with 'the following requirements apply for different campaign types'. The Smart Bidding page frames the same thresholds as recommendations without repeating any of those figures, saying that for best results some strategies rely on a minimum volume of historical conversion data and sending you to the strategy articles 'to review these recommendations'. So the threshold figures only ever come from the strategy page, and the softer word only ever from the overview. Treat the stricter wording as the one that decides eligibility.

This is the actual question, and it has nothing to do with which strategy is "more advanced." If every conversion on your account is worth roughly the same amount, a single-price product, a lead form where one lead is about as valuable as the next, Target CPA is the better fit. It's simpler to set up, doesn't require value tracking, and there's nothing for it to get wrong about relative conversion value, because there isn't any variation to get wrong.

If your conversions vary meaningfully in value, different product price points, leads of clearly different quality, a mix of free trial signups and paid purchases, Target ROAS is structurally the better tool, because it's the only one of the two designed to tell those conversions apart. But that fit comes with a hard condition: it only works if you can reliably pass accurate value data back to the platform for every conversion, not most of them, not roughly. Target ROAS optimising against bad or missing value data doesn't fail quietly, it makes confidently wrong decisions, chasing whatever conversions your broken tracking happens to be reporting as high-value, whether or not that's true.

There is also a sequence hiding inside what looks like a fork. Google's own advice for moving to value based bidding is that ideally you are already bidding to the desired conversion goal using a Target CPA strategy, and that you should report values across all relevant campaigns for four weeks or one to two conversion cycles, whichever is longer, before you determine a Target ROAS and switch it on. Read that way, Target CPA is not the lesser choice. It is frequently the correct first step toward the other one.

One setting sits underneath both, and it makes this decision on your behalf more often than anyone admits. Google states that the Include in 'Conversions' setting decides whether a conversion action appears in your Conversions and Conversion value columns, and that the data in those columns is what bid strategies like Target CPA and Target ROAS use, so your bid strategy will only optimise based on the conversions you have chosen to include. Before arguing about which strategy to run, check which actions are actually in the column. A strategy optimising on the wrong set of conversions is a larger problem than either strategy being the wrong pick.

A Target ROAS is a ratio, and Google's example spells out the arithmetic: five pounds of sales for each pound of ad spend is a Target ROAS of 500%, because 5 divided by 1, times 100%, is 500%. The next step is arithmetic on your side of it rather than anything Google publishes. Break-even ROAS is one divided by gross margin, so a 500% target only sits above break even if your gross margin is above 20%. A 400% target needs 25%. A 1,000% target needs 10%. A target set below break even loses money efficiently rather than making it, and margin appears nowhere in the Conversions and Conversion value columns that Google says both strategies optimise on.

A Target CPA hides the same assumption instead of displaying it. A target cost per conversion is a claim about what a conversion is worth to you, and the figure it should be checked against is gross profit per conversion, not last month's cost per conversion. That figure is on your side of the line, not the platform's, and it is why the number you type matters more than which of the two boxes you type it into.

If you want your account's current figure rather than an estimate, Google names the column: add Conv. value/cost from the Conversions columns and multiply it by 100 for the percentage. It also says to make sure the window you evaluate excludes the most recent conversion delay period, to get an accurate view of performance. The reason, which is arithmetic rather than anything Google spells out, is that conversions which have not landed yet make the recent days look worse than they were. One caution before you use that number as a margin test: it reports the value the platform attributed to itself, which is not the same as revenue the business banked, so check it against your own figures first.

Changing a bid strategy puts it into a documented state rather than an invisible one, except on Hotel campaigns, where Google says bid strategy statuses are not available at all. Everywhere else Google says a bid strategy status of 'Learning' may be shown after a change, and names the reasons it can appear: a new or recently reactivated strategy, a setting change, and a composition change where campaigns, ad groups or keywords were added to or removed from the strategy. Its dedicated duration page adds a fourth, an ad group target change, which it says may trigger the status on Shopping campaigns. The two pages do not agree on the count either, so read the one you are citing rather than the number. Google says there may be minor performance fluctuations while it optimises your bids, and its own next step is blunt: carry on using the account as usual, but you may not want to measure performance until the learning period is over.

That is a real cost, and it means this should be a deliberate choice made once you understand which strategy fits your business, not something you toggle back and forth every time a week's results look disappointing. Google puts a number on it in two places and in three units, which is worth knowing before you quote any of them. One page says frequent manual adjustments to budgets, to CPA or ROAS targets, or to conversion goals will reset what it calls the standard 7 to 14 day learning period and delay optimisation, and recommends avoiding further changes inside that window. The page actually dedicated to the duration does not count days at all: it says it can take up to around 50 conversion events or 3 conversion cycles for the bid strategy to calibrate to the new objective, faster where there is more conversion data, and that the learning period does not apply to manual CPC. Days are the figure everyone repeats, and the duration page does not use them. Which of the three finishes first depends on your own conversion volume and on how long a click takes to convert, which is arithmetic on your side rather than anything Google publishes. An account whose bidding is revisited every few weeks spends a good part of every month inside it. You can check where you stand rather than guessing: Google says the Status column on the Bid strategies page under Tools shows your portfolio bid strategy's status, and that hovering over it says more.

There is also a way to make a change without committing to it. Both strategy pages describe a Save as experiment option in place of Save, which runs an experiment comparing your new settings against your original campaign. In both pages it sits under the target setting, so it is documented for a change to a target rather than for a comparison of one strategy against the other. Google lists campaign drafts and experiments separately, for Search and Display campaigns, as a way to test how well Smart Bidding performs against your current bidding method. Either way, the point stands: there is a version of this decision that comes with a control arm, and it is better than making the change and watching the graph.

If your campaign is limited by budget, something happened in August 2026 that changed what your target means, and it applies to Target CPA and Target ROAS alike. Google states that on 17 August 2026 it updated its bidding systems to deliver more consistent and predictable performance based on the targets you set, even when you make budget adjustments. In its own description of the situation before that, a budget limited campaign using a target based strategy may have been overperforming on bidding targets and seeing performance fluctuations when budgets were adjusted.

The consequence is worth reading twice. Google's example is a campaign with a Target CPA of ten pounds whose recent actual cost per conversion was five, and its statement is that the campaign now delivers more closely to a ten pound actual CPA, with the remedy being to update the target to five if you want to keep the performance you had. Google also says plainly that it will not adjust your bidding targets or budgets for you. So a loose target quietly delivering a tight cost per conversion under a tight budget is no longer a tactic. It is now just a loose target.

Google's note on eligibility says App campaigns, video reach campaigns and video view campaigns continue using the previous bidding behaviour, and that Hotel and Display campaigns already had the new behaviour. It warns that a budget limited campaign which has historically overachieved its stated target may see performance volatility if nothing was changed, and that multi-channel campaigns like Performance Max and Demand Gen may also see shifts in how traffic is distributed across channels. It also says the in-account notifications are triggered for advertisers with any campaign that was limited by budget in the last 12 months on an affected target based strategy.

There is a tool for it. Google describes a Bid Target Adjustment Tool reached either from the 'Review your campaign targets' notification banner or from a campaign's Bidding settings, which offers the recent performance figure so you can apply it, keep your current target, or enter your own. If your campaigns are managed through Search Ads 360, Google says the tool will not appear in your Google Ads account and the equivalent sits behind a 'Review bid strategies' banner there instead. If nobody has looked at your targets since the summer, that is the first thing to check, before anyone reopens the question of which strategy to run.

One more column belongs in this conversation, because it is the difference between judging a bidding strategy and judging a number you once typed. Google reports an average Target CPA and an average target ROAS, each the traffic-weighted average that the strategy actually optimised for over your date range. What goes into them differs: the average Target CPA includes your device bid adjustments, your ad group Target CPAs and any changes you made to the target over time, while the average target ROAS averages the changes you made to the target. Google's instruction for Target CPA is explicit. Compare the CPA you achieved with the strategy's average target CPA, because the average target more accurately reflects what Smart Bidding is optimising towards.

Both sit in the performance table at the top of the Campaigns page, under the Performance category when you add a column, and in the bid strategy report beside Actual CPA and Actual ROAS. Neither exists for a period with no traffic, which is its own small piece of information when a report shows a blank. One restriction: Google says the average target ROAS column is only supported for Performance Max, Search and Shopping campaigns, and states outright that it is not available for Hotel campaigns, so on a Hotel, Demand Gen or video campaign you will not find it.

Then give it enough to judge. Google recommends evaluating Smart Bidding over periods with at least 30 conversions, and says 50 for Target ROAS. Its Target CPA page recommends measuring the last 30 days including at least 30 conversions. A fortnight and nine conversions is not a verdict on a bidding strategy, whichever one is running, and changing the target on that evidence starts the learning status again for nothing.

If you manage an agency or a team but don't touch the ad platforms directly, you don't need to become a bidding expert to catch a mismatch. Ask whoever runs your account four questions. Which strategy is currently active, and why. Whether your account's value tracking is solid enough to support Target ROAS, if that is what is running. What the average target was over the last 30 days, against the cost or return actually achieved. And whether anyone reviewed the targets after 17 August 2026.

A confident, specific answer to each is a good sign. A vague answer to the second, while Target ROAS is live, is worth pausing on before you spend another pound on it. A blank look at the fourth means the target in the account may no longer buy what it used to, and that is a cheaper thing to fix than a bidding strategy.