Target CPA bidding in Google Ads: how it sets bids and when to use it

This guide is built from Google Ads Help: About Target CPA bidding, About Smart Bidding learning, How to make target adjustments, Changes to target based bid strategies and Fix low traffic or conversion rate for Target CPA bidding. How Target CPA compares with the other bid strategies is in our budgets and bidding guide; this page goes into how Target CPA itself behaves once it is switched on.

What Target CPA does

Google describes Target CPA as "an automated bid strategy that sets bids for you to get as many conversions or customer actions as possible". You set the average cost per conversion you want, and Google Ads sets a bid in each auction "based on the likelihood of the ad to convert". It is one of the four Smart Bidding strategies, next to Target ROAS, Maximize conversions and Maximize conversion value.

The word to notice is average. Google says some conversions "may cost more than your target and some may cost less", and that it will try to keep your cost per conversion equal to the target overall. Your real CPA still moves with things Google does not control, such as changes to your website or ads and more competition in the auctions. With a 10 dollar target, Google Ads tries to get as many conversions as it can within your budget at 10 dollars on average.

To set each bid it uses your campaign's history plus auction-time signals such as device, browser, location, time of day and remarketing lists. Google's Smart Bidding overview lists the full set of signals, including the actual search query on Search and Shopping.

A naming note: since June 2026 Google has been relabelling "Maximize conversions with a Target CPA" as plain "Target CPA". Google's article on the change says both labels "function in the exact same way", and that the Google Ads API, Editor and mobile app will not show the new names straight away.

Before you switch it on

• Conversion tracking has to be working. You cannot set up Target CPA without it. Our conversion tracking guide covers the setup.
• Decide which conversions count. The bid strategy optimizes only for conversion actions with "Include in 'Conversions'" set to Yes. If a newsletter sign-up and a quote request both count, Target CPA treats them as the same kind of result. Google adds that Smart Bidding learns across all actions in the Conversions column, even ones set up for different goals.
• Check the budget. Google recommends making sure you are comfortable spending up to 2 times your average daily budget on a given day, within the monthly charging limit.
• History helps but is not required. Google says advertisers "can start using Target CPA with no conversion history".

Choosing the target

If the campaign has conversion history, Google Ads recommends a target. Per the Help article, that recommendation is "the average CPA from the last 30 days, adjusted for any conversion delays", or based on specific business goals when no history is available. You can accept it or enter your own.

The main risk is a target set too low. Google warns that this "may cause you to forgo clicks that could result in conversions, resulting in fewer total conversions." The same logic works the other way: Google's target adjustment article says raising a CPA target is the way to increase spend, and lowering it is the way to focus on efficiency.

Before you commit, two tools help:

• Target CPA simulators estimate how many conversions you might have had at different targets. Recommendations use the same simulation data to suggest target changes.
• Save as experiment sits next to Save when you change the strategy, so you can test the new setting against the original campaign instead of switching outright. Our Google Ads experiments guide explains how those tests split traffic.

Our own starting point is the target Google recommends, or the CPA the campaign has actually achieved, and never a wished-for number far below it. We then move it in steps and leave each step alone for at least one conversion cycle. A cost per lead that the business can afford is the upper limit; the recommended target tells you what is realistic today.

Settings: ad group targets, bid limits, devices

• Ad group targets. You can give individual ad groups their own target with standard or portfolio strategies, but Google says this "isn't recommended as it can restrict Smart Bidding." In Demand Gen campaigns, an ad group target overrides the campaign target.
• Bid limits. Maximum and minimum CPC limits exist only for portfolio Target CPA strategies, not standard ones, and apply in Search Network auctions only. Google does not recommend them because they can stop bids reaching the level that meets your target. Even the minimum is not absolute: smart pricing can set a bid below it. When limits do get in the way, the bid strategy status shows "Limited" with bid limits as the reason.
• Device adjustments change the target, not the bid. With a 10 dollar target, a +40% mobile adjustment raises the target to 14 dollars on mobile. A −100% adjustment stops ads showing on mobile. Google says other (non-device) bid adjustments are ignored on Search and Display, and suggests removing old manual CPC adjustments when you switch.
• Pay for conversions. Display campaigns can be set to pay per conversion instead of per click under "Pay for" in the bidding section. Bid limits are not available for Display-only campaigns.

If you plan for a sale or another short spike in conversion rate, Google's Smart Bidding performance article points to seasonality adjustments, and to data exclusions for conversion tracking outages. Our seasonality adjustments guide covers both.

Standard or portfolio strategy

A standard strategy belongs to one campaign. A portfolio bid strategy groups several campaigns, ad groups and keywords under one target and is managed from the Shared library under Bid strategies. Google's Smart Bidding setup article calls the portfolio route "recommended". Two points from the Help pages:

• Portfolio strategies are not available for Performance Max campaigns.
• Applying a new portfolio strategy is a structural change and can show "Learning" for up to 7 days, though Google says ramp-up should be fast for campaigns that already have conversion history.

Google's learning article advises consolidating campaigns where possible "to pool conversion data into larger datasets", and a portfolio does that for bidding. Our own rule is to keep campaigns with very different lead values or margins on separate targets. If campaigns also share one budget, read our shared budgets guide first: Google's bid strategy statuses article flags "Misconfigured" when Maximize strategies share a budget with campaigns that are not all on the same portfolio.

Learning status and conversion cycles

Google's learning article is more precise than most advice you will read. "Learning" is a status shown after a structural change, and it "never lasts more than 7 days". Your ads keep running normally while it shows. There are three triggers:

• New strategy: the bid strategy was created or reactivated.
• Composition change: campaigns, ad groups or keywords were added to or removed from the strategy.
• Goal change: the conversion goals or actions being optimized changed significantly.

Changing the budget, the target, creatives or targeting such as location or audience does not trigger it, and Google says these "never remove your historical data". A changed target takes effect at once; Google says Smart Bidding "will start optimizing to your new goal within minutes."

What takes longer is reaching the new target. Google says this usually takes 1 to 2 conversion cycles, the typical time between a click and its conversion. If most clicks convert within 7 days, expect about 7 days. That is why Google advises against several target changes inside one conversion cycle unless there is a real business need. Each change gives the bidder a new goal before the results of the previous one have come in.

For evaluation, Google suggests waiting those 1 to 2 cycles and then looking at 2 conversion cycles or a 2-week window, whichever is longer, allowing for conversion delay. Conversions are reported by impression date, so the most recent days look worse than they will end up. As Google's conversion delay article puts it, delay can make CPA "seem higher" than it actually is.

The August 2026 change for budget-limited campaigns

From 17 August 2026 Google changed how Target CPA and Target ROAS behave in campaigns that are "Limited by budget". Before, such a campaign could beat its target; now it delivers closer to the target you set. Google's own example: a campaign with a 10 dollar target that has been achieving 5 dollars "now delivers more closely to a $10 USD actual CPA."

App, Video reach and Video view campaigns keep the old behaviour, and Display and Hotel already worked the new way; in Performance Max and Demand Gen traffic may also shift between channels. Google "won't automatically adjust your bidding targets or budgets", so the options are yours:

• keep the target if it is the real business limit;
• lower it towards the CPA you were actually getting, to keep that performance;
• set a different number in between;
• switch to Maximize conversions, whose CPA then moves with the budget;
• raise the budget, which Google says now scales more predictably at the stated target.

After a budget increase, Google suggests waiting 1 to 2 conversion cycles before judging the result. Our advice: any Target CPA campaign that was budget-limited and well under target before August deserves a fresh look at its target.

Measuring it: average target CPA

The number to compare your actual CPA against is not the target you typed in but the average target CPA. Google defines it as the traffic-weighted average CPA the strategy optimized for, including device adjustments, ad group targets and any target changes in the period. Add it as "Avg. target CPA" from the Performance column group on the Campaigns page, or open the bid strategy report, where it sits next to "Actual CPA".

Google recommends measuring over periods with at least 30 conversions, and the bid strategy report flags conversion delay and reporting outages at the bottom of its chart. Judge the conversions and CPA the strategy is built for. Google warns against reading "trailing, dependent metrics like cost-per-click and impressions", which can move in the opposite direction.

When traffic or conversion rate drops

Google's troubleshooting article names three causes for fewer clicks after switching:

• The target is too low. If it is well below the campaign's historical average CPA, it "may not be attainable while maintaining reasonable levels of traffic". Raise it, or raise the budget if that is what is short.
• You are looking at clicks, not conversions. Target CPA can lower impressions and clicks while conversions go up.
• Conversion tracking was removed. If the conversions being tracked are removed, ads in Target CPA campaigns stop running until tracking is on again.

A lower conversion rate is not always bad. Google's example: clicks at 1 dollar converting 1 in 10 cost 10 dollars per conversion; if the strategy finds clicks at 0.10 dollars converting 1 in 50, conversion rate falls to 2% but each conversion costs 5 dollars. Other statuses worth checking are "Limited" (by inventory, bid limits or budget) and "Misconfigured (conversion setting)", which means the strategy has no usable conversion action, for example one that was removed or not included in Conversions.

Target CPA counts every included conversion the same, so if your leads or sales differ a lot in value, a value-based strategy is the next step; our conversion value rules guide shows how values are adjusted. If you want a second opinion on your bidding setup, our website team can look at the account and the conversion tracking behind it.

Frequently asked questions

How does Target CPA bidding work in Google Ads?

You set the average cost per conversion you want. In each auction Google Ads predicts the chance of a conversion from signals such as device, location, time and query, and sets the bid so that the campaign gets as many conversions as possible at that average. Individual conversions can cost more or less.

How long is the Target CPA learning period?

The "Learning" status never lasts more than 7 days and appears after a new strategy, a composition change or a goal change. Reaching a new target usually takes 1 to 2 conversion cycles. Changing the target or budget does not trigger Learning.

What target CPA should I start with?

Google recommends a target based on the average CPA of the last 30 days, adjusted for conversion delay. A target well below what the campaign achieves now usually means fewer conversions, so start near the recommendation and move in steps.

Can I use Target CPA without conversion history?

Yes. Google says advertisers can start with no conversion history, but conversion tracking must be set up first. Without history, the recommended target is based on your business goals rather than past CPA.

Is "Maximize conversions with a Target CPA" the same as Target CPA?

Yes. Since June 2026 Google has been renaming it to "Target CPA". Both labels work the same way, and some tools such as the API and Editor will keep the old name for a while.

For more on Google Ads, see our guides to Google Ads basics, Performance Max, offline conversion import and recommendations and optimization score.