Google Ads Bidding Strategies Explained: Maximise Conversions, Target CPA or Target ROAS?

Set up a new Google Ads campaign and one of the first questions you face is how you want to bid. The options sound similar and technical: Maximise Clicks, Maximise Conversions, Target CPA, Target ROAS, Maximise Conversion Value, Manual CPC. Many business owners pick whatever Google recommends, or whatever their last agency used, without really understanding the choice. Yet the bidding strategy quietly decides how your budget is spent in every single auction.

Understanding Google Ads bidding strategies is not about memorising definitions. It is about matching the strategy to your goal, your data and the stage your account has reached.

How Google Ads bidding works

Every time someone searches, Google runs an auction among advertisers whose ads are eligible. Your bid, combined with the quality and relevance of your ad and landing page, determines whether your ad appears and where. With manual bidding, you set the maximum you are willing to pay for a click. With automated bidding, often called Smart Bidding, Google's systems adjust bids in each auction based on signals such as device, location, time, the search itself and the likelihood of a conversion.

Automated strategies are only as good as the information they receive. Accurate conversion tracking is therefore the foundation of every strategy except Maximise Clicks and Manual CPC.

Maximise Clicks

This strategy aims to get as many clicks as possible within your budget. It can be useful for new campaigns that need traffic to gather data, or for awareness-focused goals. Its weakness is that it treats all clicks as equal, so it may favour cheap clicks from people unlikely to buy. For most businesses seeking leads or sales, it should be a short-term starting point rather than a long-term strategy.

Maximise Conversions

Maximise Conversions tries to get as many conversions as possible within your daily budget. It works well for lead generation businesses once conversion tracking is reliable, and it is a common choice for newer campaigns that do not yet have enough history for target-based bidding. The risk is that it will spend your full budget chasing conversions, even if cost per lead rises. If your conversion definition includes low-quality actions, such as any page visit or a brochure download, it will optimise for those rather than real enquiries.

Target CPA

Target CPA, or target cost per acquisition, asks Google to get as many conversions as possible at or around a cost per conversion you set. It suits businesses that know what a lead or sale is worth to them and have a steady flow of conversion data. Setting the target sensibly matters. A target far below your historical average can starve the campaign of volume, while a realistic target that you lower gradually tends to work better. Target CPA is particularly useful for lead generation in sectors such as education, real estate, healthcare and B2B services, especially when combined with offline conversion data showing which leads became customers.

Maximise Conversion Value and Target ROAS

For e-commerce and businesses where conversions have different values, value-based strategies are often more appropriate. Maximise Conversion Value aims to generate as much revenue as possible within your budget. Target ROAS, or target return on ad spend, aims for a specific ratio of revenue to spend. These strategies require you to pass accurate transaction values to Google Ads, and they work best with consistent purchase volumes. If your product margins vary widely, consider using values that reflect profitability rather than raw revenue.

Manual CPC

Manual CPC gives you direct control over bids at keyword level. Some advertisers still prefer it for small, tightly controlled campaigns or for specific situations such as brand protection. However, it cannot use the real-time signals that automated strategies consider, and it takes significant time to manage well. Some newer campaign types, including Demand Gen, do not support Manual CPC at all, which reflects the broader direction of Google Ads towards automation.

Choosing the right strategy for your stage

A practical progression for many accounts looks like this. A brand-new campaign with no conversion history might begin with Maximise Clicks or Maximise Conversions to gather data. Once conversions are flowing steadily, a move to Target CPA or Target ROAS gives more control over efficiency. As offline conversion data and values become available, value-based bidding can align spend with real business outcomes.

Whatever strategy you choose, avoid changing it frequently. Automated bidding needs a learning period after significant changes, and constant adjustments keep campaigns in a state of instability. Change targets gradually and judge results over weeks rather than days.

Common mistakes to avoid

The most damaging mistake is using automated bidding with broken or misleading conversion tracking. Others include setting unrealistic targets, starving campaigns with tiny budgets relative to the target, counting duplicate conversions, and switching strategies during peak seasons when conditions are already volatile.

Frequently asked questions

Which bidding strategy is best for lead generation?

Maximise Conversions is a good starting point, with Target CPA once you have steady conversion data and a clear cost target.

How much data does Smart Bidding need?

More data generally means better results. Campaigns with very few conversions can struggle with target-based strategies.

Should I ever go back to manual bidding?

Occasionally, for very small or specialised campaigns, but most accounts benefit from well-fed automated bidding.

Get your bidding right

OM Enterprises audits Google Ads accounts, fixes conversion tracking and chooses bidding strategies that match your goals and data. Request a Google Ads audit.