Here is a pattern you have probably lived through. You switch a campaign to Smart Bidding, the conversion count climbs, the cost per conversion drops, and the dashboard looks great. Then the sales team tells you the leads are junk. Or the revenue report shows flat sales on rising ad spend. The numbers Google optimized for went up. The numbers your business cares about did not.
This is not the algorithm misbehaving. It is doing exactly what you told it to do: get more conversions, as cheaply as possible. If you told it every conversion is worth the same, it will chase the cheapest ones. Value-based bidding is how you change the instruction. Instead of counting conversions, you tell Google Ads what each one is worth, and let it bid toward value instead of volume. In our experience managing paid budgets across ecommerce and lead generation, this is one of the highest-leverage changes you can make in an account. It is also one of the easiest to get wrong.
Why more conversions can mean less revenue
Conversion-based bidding, strategies like Maximize conversions and Target CPA, optimizes for the number of conversions. Every conversion is treated as equal. A one-euro order and a two-thousand-euro order look the same to the algorithm. A tyre-kicker who fills in a form and a buyer ready to sign both count as one.
Most businesses do not have equal conversions. In ecommerce, order values vary wildly. In lead generation, a demo request from a 500-person company is worth far more than a student downloading a free guide. When you flatten all of that into a single conversion count, you hand the algorithm a blurry target. It will optimize toward whatever is cheapest and most frequent, which is often the lowest-value action.
The lead quality complaint, explained
When marketers say Smart Bidding "brought in garbage leads," the tracking is usually the cause. If a form submission is your conversion and every submission counts as one, the system learns to buy more form submissions. It has no idea which ones your sales team closed. Fix the signal and the behavior changes. That fix is value-based bidding.
What value-based bidding actually is
Value-based bidding is a form of Smart Bidding that optimizes for the value each conversion brings, not the count. You attach a value to every conversion, and Google Ads uses its AI to predict the value of each new search and bid toward the ones worth the most. It is the same auction-time machinery behind Target CPA, pointed at a different goal.
The mental shift is small but important. With conversion-based bidding you ask: how do I get more conversions for my budget? With value-based bidding you ask: how do I get more value for my budget? For a deeper look at how the different automated strategies compare, our guide to Google Ads bidding strategies breaks each one down.
Conversion-based bidding
Optimizes for the number of conversions. Every conversion is worth the same. Good when your conversions are genuinely similar in value.
Value-based bidding
Optimizes for total conversion value. Conversions carry different values. Best when order sizes or lead quality vary a lot.
There is one hard requirement. Value-based bidding only works if you are sending values into the account. That means your conversion tracking has to pass a value with each conversion, and those values need to reflect reality. No values, no value-based bidding.
The two value-based strategies
Google Ads gives you two value-based bid strategies. They share the same engine and differ only in whether you set an efficiency target.
Maximize conversion value
Spends your full daily budget to generate as much total value as possible, with no efficiency constraint. Use it when your goal is to extract the most value you can from a fixed budget, and you are comfortable letting return on ad spend float.
Target ROAS
Generates as much value as possible while holding a specific return on ad spend. Set a 400 percent target and Google tries to bring in four euros of value for every euro spent. Use it when you have a real efficiency number to hit. If you are unsure how to set that number, our piece on ROAS calculation walks through the math.
A naming change worth knowing about
From June 2026, Google renamed the strategies. "Maximize conversion value with a Target ROAS" is now simply "Target ROAS", and "Maximize conversions with a Target CPA" is now "Target CPA". The labels are cleaner, but the underlying bidding behavior did not change and you do not need to touch your account because of it.
Which one to start with
If you are new to value-based bidding, start with Maximize conversion value. It lets the algorithm learn what value looks like in your account without the extra pressure of an efficiency target. Once you have enough value data and a stable return, layer in a Target ROAS that reflects the performance you are already seeing. Setting an aggressive target from day one is the fastest way to choke your volume.
Getting your conversion values right
This is the part that decides whether value-based bidding works or backfires. The algorithm is only as smart as the values you feed it. Garbage values in, garbage bidding out. Start by deciding what "value" means for your business.
- arrow_forwardRevenue. The simplest option for ecommerce. Pass the actual order value with each purchase. Easy to implement and hard to argue with.
- arrow_forwardProfit or margin. Better than revenue if your margins vary by product. A high-revenue, low-margin category can quietly drain budget when you optimize on revenue alone.
- arrow_forwardPredicted lifetime value. Useful for subscriptions and repeat-purchase businesses. A first order might be small, but the customer behind it is worth much more over time.
- arrow_forwardLead value. For lead generation, assign a value that reflects lead quality or expected close value. More on this in the next section.
Static values versus dynamic values
Dynamic values, the real order value passed with each transaction, are ideal because they reflect exactly what happened. When you cannot capture the real value, static proxy values are a reasonable start. Assign a sensible estimate to each conversion type, for example 100 for a demo request and 20 for a newsletter signup, so the algorithm at least understands that not all actions are equal. Move to dynamic values as soon as your tracking allows.
Fine-tune with conversion value rules
Conversion value rules let you adjust values based on conditions, without changing your underlying tracking. You can raise the value of conversions from a particular location, device, or audience. If customers from a certain region are worth more to you, or returning visitors close at a higher rate, a value rule tells the algorithm to bid up for them. Use these carefully and sparingly. They are a scalpel, not a hammer.
Value-based bidding for lead generation
Ecommerce has it easy. The value of a sale is known the moment the order confirms. Lead generation is harder, because the value of a lead is not clear until days or weeks later when it qualifies, books, or closes. This gap is exactly why so many lead-gen accounts drown in low-quality leads. The bidding optimizes on the form fill, because that is the only signal it gets.
The fix is to close the loop and send the outcome back to Google Ads. Two mechanisms do this.
- arrow_forwardEnhanced conversions for leads. Your form captures the lead's email or phone, which is hashed with SHA-256 before it leaves your site. Later you upload the outcome, such as qualified or closed, and its value, keyed to that hashed identifier. Google matches it back to the original click using first-party data.
- arrow_forwardOffline conversion import. The older method, which matches outcomes back to clicks using the Google Click ID captured at form submission. It applies conversion data up to 90 days old to the bidding algorithm, which suits longer sales cycles.
With either method, the conversion value is technically optional but genuinely worth setting. When you send back the value of a qualified or closed lead, Smart Bidding stops treating all form fills as equal and starts favoring the clicks that turn into revenue. This is the real answer to the low-quality lead problem, and it depends on the same discipline as any good measurement setup: a solid first-party data strategy.
Start simple, then get precise
You do not need a full revenue attribution model on day one. Begin by sending back two values: a modest value for a qualified lead and a larger value for a closed deal. Even that coarse signal teaches the algorithm the difference between a form fill and a customer. Refine toward real deal values as your CRM data allows.
How to roll it out safely
Switching bid strategies always carries a learning period, where performance can wobble while the algorithm recalibrates. A measured rollout keeps that wobble small.
Get values flowing first
Before you change any bid strategy, confirm that real values are landing in your conversion columns. Check that the numbers match your back-end. This step is non-negotiable.
Gather enough data
Google recommends at least 50 conversions in your chosen timeframe before moving to Target ROAS. Let the account accumulate value data before you add an efficiency constraint.
Start with Maximize conversion value
Let the strategy learn what value looks like without a target holding it back. Give it a couple of weeks and watch total value, not just conversions.
Layer in a realistic Target ROAS
Once value is stable, set a target close to the ROAS you are already achieving. Tighten it gradually. Big jumps in the target usually cause big drops in volume.
Monitor value, not vanity metrics
After the switch, conversion count may fall while conversion value rises. That is the strategy working. Judge it on value and ROAS, and keep an eye on spend so a learning period does not quietly blow the budget.
That last point is where most switches go sideways. When the conversion count drops, it is tempting to panic and revert before the strategy has settled. This is why we built aubado around checking the numbers that matter once a day rather than reacting hour to hour. Our Google Ads and Budget Control apps surface whether value and spend are tracking where they should, so you can hold your nerve through the learning period with data instead of guesswork.
Frequently Asked Questions
Keep your nerve through the learning period
Value-based bidding pays off when you can see whether value and spend are tracking right, without living in the account. aubado gives you a calm daily read on your Google Ads performance and budgets. Check once a day, stay in control, then get back to the work that matters.
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