Google Ads Bidding Strategies Explained: Which One Should You Use?

Switching bidding strategies is one of the most disruptive things you can do to a Google Ads account. We’ve seen accounts reset months of machine learning, spike CPAs, and spend weeks recovering from a bidding change that was made because results dipped for a fortnight. It’s also sometimes exactly the right call. The difference between those two outcomes usually comes down to timing, data, and whether the current strategy ever had a fair chance to work.

This is the bit that most coverage of Google Ads bidding strategies skips. Getting PPC bidding strategies explained from first principles is useful, but the more practical question is how to choose one for your specific account situation and when switching is genuinely necessary versus when you’re just reacting to normal variation. That’s what this post covers.

Why Your Bidding Strategy Is More Important Than Your Budget

Budget controls how much you spend. Bidding strategy controls how Google spends it.

A well-chosen strategy on a modest budget will outperform a poorly chosen one with twice the spend. We’ve had accounts cut CPAs significantly by switching Google Ads bidding strategies without changing budget at all. The reverse is equally common: increasing budget while leaving an inappropriate strategy in place tends to accelerate the same inefficiencies rather than fix them.

Google’s own guide to choosing a bid strategy based on your goals frames the decision around campaign objectives, which is a reasonable starting point. The framing can be slightly misleading though, because it implies the choice is mostly about what you want from the campaign. In practice, the bigger constraint is usually what your account can support. If you don’t have enough conversion data, certain Google Ads bidding strategies simply won’t have the inputs they need to function well, and choosing them prematurely often produces worse results than something simpler.

Knowing which Google Ads bidding strategy to use starts with an honest assessment of your data, not just your goals.

And if you’re still weighing whether paid search is the right channel at all, Google Ads vs SEO covers the investment case for each. Once you’re committed to Google Ads, bidding strategy is where most of the marginal gain sits.

Manual CPC: Full Control, More Work

Manual CPC means setting a maximum bid for each keyword yourself. Google doesn’t adjust those bids automatically, so results reflect your decisions directly.

For brand new accounts with no conversion history, it’s often the right starting point. Smart Bidding Google Ads relies on conversion signals to learn from, and a new account with no data doesn’t have any. Running on Manual CPC while you build up volume is a legitimate approach, not a workaround.

It doesn’t scale well. When you’re managing dozens of keywords, staying on top of bid adjustments while tracking quality scores, competitor movements, and performance shifts stops being practical fairly quickly. The time cost grows faster than the account does. Once conversions are flowing consistently, an automated strategy almost always handles the work more accurately.

One scenario where Manual CPC stays useful longer-term: small, tightly defined campaigns targeting highly competitive terms where you need precise control over individual keywords. It works when volume is manageable and you’re willing to stay on top of it actively.

Enhanced CPC: The Middle Ground

Enhanced CPC (ECPC) gives Google permission to adjust your manual bids in individual auctions when it calculates a conversion is more or less likely. The positioning made sense a few years ago, before Target CPA and Maximise Conversions became as data-efficient as they now are. Google has already deprecated ECPC for new Search campaigns and the phase-out is ongoing.

Worth knowing it exists. Not worth building a strategy around.

Maximise Clicks: Good Start, Bad Long-Term Strategy

Maximise Clicks does one thing: spends your budget to get as many clicks as possible. Google isn’t optimising for conversions, leads, or revenue. Just clicks.

For a brand new campaign with no conversion data, this is sometimes acceptable. You get traffic flowing, you see what patterns emerge, and you start building the signals your account eventually needs for smarter Google Ads bidding strategies. That’s the legitimate use case, and it’s a time-limited one.

Outside of that early window, Maximise Clicks is one of the most consistent sources of wasted spend we find in PPC audits. Google will find clicks. They won’t necessarily come from people who’d ever buy from you, enquire, or do anything useful. Accounts that have been running on Maximise Clicks for six or twelve months often look fine on click metrics and less fine when you dig into conversion rates and cost per lead.

If you’ve inherited an account running on Maximise Clicks with conversion tracking already in place, switching should be a priority.

Target CPA: Let Google Optimise for Conversions

Of all the Google Ads bidding strategies available for lead generation, Target CPA is the one we default to most often. You set a target cost per conversion, and Google’s machine learning adjusts bids across every auction to try to hit it. When there’s enough data to work from, it removes most of the manual bid management burden and produces conversions at a more predictable cost than anything requiring constant human input.

The requirement that catches most accounts out is data volume. The threshold that gets cited most often is 30-50 conversions in the trailing 30 days, though Google’s underlying models have improved enough that it can function on somewhat less than that now. Below a certain minimum, Target CPA Google Ads simply doesn’t have enough signal to learn from, and it will either underspend (playing it too safe) or overpay for conversions that fit a pattern it’s misread.

The learning phase is the other thing worth understanding before you switch. Every significant change to a campaign on Target CPA triggers a recalibration period, during which CPAs can spike and performance looks worse than before the switch. Google’s own explanation of how Target CPA bidding works covers the signals it uses and how it adapts. The practical implication: give it time, and avoid making multiple changes in quick succession after switching. The instinct to intervene when CPAs look high in week one is usually counterproductive.

Target CPA Google Ads isn’t a plug-in-a-number-and-leave-it strategy. It works for accounts with clean, consistent conversion tracking, budgets that aren’t being adjusted constantly, and managers who can resist the urge to intervene when CPAs look high in the first fortnight. That last part is harder than it sounds, and it’s where a lot of accounts undo progress they’d otherwise have kept.

If you’re unsure whether your account has enough data to move to Target CPA, our PPC management team can usually answer that in the first five minutes of an account review.

Target ROAS: Revenue-Focused Bidding

Target ROAS bidding answers a different question to Target CPA. If you’re selling products across a wide price range, optimising for conversion volume alone means Google treats a £20 sale and a £500 sale as equivalent wins. Set a Target ROAS of 400% and you’re telling it to care about the revenue, not just the conversion event: you want £4 back for every £1 spent.

It makes most sense for ecommerce accounts where conversion values genuinely vary. If yours don’t, Target CPA is almost always the simpler and equally effective choice, and the lower data requirement makes it easier to get running well.

The data requirement is steeper than Target CPA. Google typically needs 50 or more conversions with meaningful value variation before Target ROAS bidding can learn effectively. Set it too early and you’ll usually see either very conservative bidding or performance that swings unpredictably. It needs stability and volume to work well, and it needs accurate revenue values being passed to Google on every conversion.

Maximise Conversions and Maximise Conversion Value

These two are the most commonly misunderstood strategies in the Smart Bidding Google Ads lineup.

Maximise Conversions tells Google to get as many conversions as possible within your budget, with no CPA target attached. It’s most useful as a transitional strategy: accounts that have the conversion data for Smart Bidding but aren’t yet sure what CPA target to set can run on Maximise Conversions to gather baseline performance data, then layer in a target once they understand what a realistic cost per conversion looks like.

Maximise Conversion Value is the ecommerce equivalent, optimising for total revenue rather than conversion volume. Both strategies can run without a target (fully spend-focused) or with a target added, at which point they effectively become Target CPA and Target ROAS respectively.

The caveat with both in their uncapped form: Google will spend your full daily budget regardless of whether the resulting conversions are profitable. Useful for scaling when the conditions are right. Watch it closely. Uncapped Maximise strategies drift without oversight.

When to Switch Strategies (and When Not To)

Every bidding strategy change triggers a learning phase. During it, CPAs can spike, impression share can drop, and the whole account can look like it’s unravelling when it’s actually just recalibrating. The harder skill is knowing whether the underperformance you’re seeing is the strategy genuinely failing or the learning phase doing what learning phases do.

Switch when a strategy has had enough time and data to prove itself and is still consistently missing targets by a meaningful margin. Four to six weeks of underperformance, with adequate conversion volume throughout, is usually enough to conclude the strategy isn’t working for this account. Also switch when the campaign purpose changes fundamentally, for example if you’re adding conversion tracking that didn’t exist before, or if a lead generation campaign is becoming an ecommerce one.

Don’t switch mid-learning-phase from a previous change. Don’t switch in the weeks before a peak trading period or major campaign event, because a learning phase during peak traffic is one of the more expensive mistakes it’s possible to make in a Google Ads account. And don’t switch just because one or two weeks looked bad. Normal variation in Google Ads bidding strategies can produce short-term swings that look alarming and resolve without intervention.

The broader point about PPC bidding strategies explained across most resources is that they’re presented as if the choice is made once and stays fixed. In reality, the right strategy evolves as an account matures. An account six months old with fifty conversions a month needs different Google Ads bidding strategies to an account two years old with two hundred. Matching the strategy to the account’s actual state, not its aspirational state, is where most of the gains sit.

If you want a second opinion on which Google Ads bidding strategy to use for your account, we offer free audits through our London pay per click team . No obligation, and we’ll tell you honestly if your current setup is already working well.

Get a free Google Ads audit →nautilusmarketing.co.uk/pay-per-click-ppc-agency-london/