Google Ads gives you more bidding options than any other advertising platform. That flexibility is powerful — but it also means that choosing the wrong strategy can drain your budget without delivering results. The right bidding strategy depends on your campaign’s maturity, your conversion volume, your business model, and what you are actually trying to achieve.
This guide covers every major Google Ads bidding strategy, explains exactly how each one works, and tells you when to use it — and when to avoid it.
Manual Bidding vs Smart Bidding: The Core Distinction
Every Google Ads bidding strategy falls into one of two categories: manual bidding or Smart Bidding.
Manual bidding means you set the maximum cost per click for each keyword or ad group yourself. Google will never spend more than your specified bid, and you have complete control over every bid decision. The downside is that manual bidding does not respond to real-time signals — it treats every auction the same regardless of whether the user is on mobile or desktop, searching at 9am or midnight, located in your best-converting city or a geography that never converts.
Smart Bidding uses Google’s machine learning to set bids automatically in every auction based on dozens of real-time signals: device, location, time of day, search query, browser, remarketing list membership, and more. Smart Bidding strategies require conversion tracking to function, and they need sufficient conversion volume to learn effectively. In accounts with strong conversion data, Smart Bidding consistently outperforms manual bidding. In new accounts with limited data, it can make poor decisions.
The Seven Core Bidding Strategies
Manual CPC
Manual CPC is the simplest strategy. You set a maximum bid for each keyword, and Google charges you up to that amount per click. There is no automation — you are in full control.
Use it when: You are just starting out and do not yet have conversion data. Manual CPC lets you control spend tightly while you gather the data Smart Bidding needs. It is also appropriate for brand campaigns with very predictable traffic or for highly sensitive accounts where you cannot afford budget instability.
Avoid it when: You have sufficient conversion volume and want Google’s algorithms to optimise across real-time signals. Manual bidding cannot compete with Smart Bidding once you have the data to support it.
Enhanced CPC (eCPC)
Enhanced CPC is a hybrid. You set your bids manually, but Google can automatically raise or lower them by up to 30 percent when it predicts a conversion is more or less likely. It was one of Google’s first Smart Bidding experiments and is now largely a transitional strategy.
Use it when: You want to dip a toe into automated bidding without giving Google full control. It works reasonably well for accounts with moderate conversion volume that are not yet ready for full Smart Bidding.
Avoid it when: You have strong conversion data — Maximize Conversions or Target CPA will outperform eCPC significantly. Google has been quietly deprecating eCPC, so it is not a long-term strategy to build on.
Maximize Clicks
Maximize Clicks does exactly what it says: Google tries to get you as many clicks as possible within your daily budget. There is no consideration of conversion likelihood — a click is a click. You can set a maximum CPC bid cap to prevent Google from bidding too high on individual clicks.
Use it when: You want to drive traffic volume quickly, typically at the start of a campaign when you need data before Smart Bidding can work. It is also useful for brand awareness campaigns where clicks and impressions matter more than direct conversions, or for low-competition informational content where you want coverage at minimal cost.
Avoid it when: You care about conversion efficiency. Maximize Clicks will happily burn your budget on clicks from people who will never convert.
Maximize Conversions
Maximize Conversions tells Google to get you as many conversions as possible within your daily budget, without any target on what those conversions should cost. Google uses Smart Bidding signals to bid aggressively on auctions it predicts will convert and conservatively on auctions it predicts will not.
Use it when: You have conversion tracking set up and want to let the algorithm optimise, but you do not yet have a clear target CPA. This is typically the best entry point into Smart Bidding — let Maximize Conversions run for four to six weeks, establish a stable cost per conversion, then add a Target CPA based on actual performance data.
Avoid it when: Your budget is very tight relative to your target CPA. Maximize Conversions without a CPA cap can lead to situations where Google spends your entire budget on a single high-value auction. If cost efficiency matters, add a Target CPA once you have baseline data.
Target CPA
Target CPA (cost per acquisition) tells Google the average amount you want to pay per conversion. Google will adjust bids automatically to try to hit that target across your campaign, spending more aggressively in auctions it predicts will convert and pulling back in auctions it predicts will not.
Use it when: You have a clear understanding of what a lead or customer is worth to your business, and you have at least 30 to 50 conversions per month to give the algorithm enough data. Target CPA is the go-to strategy for lead generation campaigns where each conversion has roughly equal value.
Avoid it when: Your conversion volume is below 30 per month. With insufficient data, Target CPA will under-deliver or make inconsistent decisions. Also avoid setting your Target CPA too aggressively at the start — begin at or slightly above your current average CPA and tighten it gradually over two to three week intervals.
Maximize Conversion Value
Maximize Conversion Value is the value-focused equivalent of Maximize Conversions. Instead of maximising the number of conversions, it maximises the total conversion value within your budget. This requires you to assign values to your conversion actions — either fixed values per conversion type or dynamic values from your ecommerce platform.
Use it when: Your conversions have meaningfully different values. An ecommerce store selling products at different price points, or a business with tiered service packages, should optimise for value rather than volume. Getting fewer but higher-value conversions is better than getting more low-value conversions.
Avoid it when: All your conversions have equal value or you have not set up conversion values. Without proper value data, this strategy behaves identically to Maximize Conversions.
Target ROAS
Target ROAS (return on ad spend) tells Google the revenue you want for every pound or dollar you spend. A Target ROAS of 400% means you want £4 in conversion value for every £1 in ad spend. Google adjusts bids in real time to try to hit that blended return across your campaign.
Use it when: You are running ecommerce campaigns with dynamic conversion values, or any campaign where conversion values vary significantly. Target ROAS is the most sophisticated Smart Bidding strategy and delivers the strongest results when conversion volume is high — Google recommends at least 50 conversions per month, and campaigns with 100+ conversions per month tend to see the biggest gains.
Avoid it when: Your conversion volume is low or your conversion values are inaccurate. An incorrect ROAS target set too high will cause the campaign to under-deliver and miss auctions. Start with a ROAS target at or slightly below your current actual ROAS and tighten it over time.
The Smart Bidding Learning Period
Every time you change a bidding strategy or significantly adjust a Target CPA or ROAS, your campaign enters a learning period of approximately one to two weeks. During this time, Google’s algorithm is adjusting its models to the new parameters, which typically causes performance volatility — costs may rise, conversion rates may dip, and impression share may fluctuate.
The worst thing you can do during a learning period is make additional changes. Every significant change restarts the learning period. Best practice is to let the campaign stabilise for at least two full weeks before evaluating performance or making further adjustments. If costs remain elevated after two weeks, adjust your target gradually — 10 to 15 percent at a time — rather than making dramatic changes.
How to Transition Between Strategies
A common progression for a new Google Ads campaign looks like this: start with Manual CPC or Maximize Clicks to build conversion data, switch to Maximize Conversions once you have 15 to 20 conversions per month, establish your average CPA, then add a Target CPA once you have 30 to 50 consistent monthly conversions. For ecommerce with clear conversion values, the path continues to Maximize Conversion Value and ultimately Target ROAS at high volume.
Never jump straight to Target CPA or Target ROAS on a new campaign with no conversion history. The algorithm has nothing to learn from, and it will make poor decisions. Build the data first, then let Smart Bidding use it.
Portfolio Bid Strategies
Google also offers portfolio bid strategies, which apply a single Smart Bidding strategy across multiple campaigns simultaneously. This is useful when individual campaigns do not have enough conversion volume to support Smart Bidding on their own, but the combined volume across campaigns would give the algorithm sufficient data. Portfolio strategies are managed at the shared library level and can be a good solution for accounts with fragmented campaigns targeting similar audiences.
Want expert help implementing these strategies? Our PPC management services in Dubai cover everything from campaign structure to ongoing optimization.
Frequently Asked Questions
Which Google Ads bidding strategy should beginners use?
Start with Maximize Conversions if you have reliable conversion tracking in place. This strategy lets Google optimize for the actions that matter while you learn the platform. If you do not yet have conversion tracking set up, use Manual CPC to maintain full control over bids while you gather data. Avoid Target ROAS or Target CPA until you have at least 30 to 50 conversions per month, as the algorithm needs sufficient data to optimize effectively.
When should I switch from Manual CPC to Smart Bidding?
Switch to Smart Bidding once you are consistently generating at least 15 to 30 conversions per month per campaign and your conversion tracking is accurate. Smart Bidding uses machine learning that requires a meaningful volume of conversion data to outperform manual bidding. If your conversion volume is low, Smart Bidding may make erratic decisions. Start with Maximize Conversions, then add a Target CPA once you have a stable cost per conversion baseline over two to four weeks.
What is the difference between Target CPA and Target ROAS?
Target CPA tells Google the maximum you want to pay per conversion, regardless of conversion value. Target ROAS tells Google the return on ad spend you want to achieve, which means it factors in conversion values. Use Target CPA for lead generation where each conversion has roughly equal value (like a form submission). Use Target ROAS for ecommerce or scenarios where conversion values vary significantly (like different product prices or tiered service packages).
Why did my cost per conversion spike after switching bidding strategies?
Google’s Smart Bidding algorithms go through a learning period of one to two weeks after any bidding change. During this time, the system tests different bid levels to understand the new strategy parameters, which often causes temporary cost increases. Avoid making additional changes during the learning period. If costs remain elevated after two weeks, your target may be too aggressive. Gradually relax your Target CPA or ROAS by 10 to 15 percent and monitor for another week.
Can I use different bidding strategies for different campaigns?
Yes, and this is often the best approach. Brand campaigns with high conversion rates and low competition can use Target CPA with aggressive targets. High-intent non-brand campaigns benefit from Maximize Conversions with a Target CPA. Prospecting campaigns targeting broader keywords might perform better with Maximize Clicks initially while gathering conversion data. Match the bidding strategy to the campaign’s maturity level and conversion volume.
Related: decision framework for choosing the right bidding strategy
