Google Ads Bidding Strategies: Manual CPC, Target CPA and Target ROAS
Practice4 minInnovialabs editorial team
In short
Manual CPC suits launches and full control, Maximize Clicks suits gathering traffic without data, and Target CPA or ROAS work once the account steadily collects well-configured conversions and their values.
The short answer
Pick a strategy by answering two questions: do you have reliable conversion data and does the business care more about lead volume or revenue.
- No data, need traffic → Maximize Clicks or Manual CPC.
- Conversions tracked, but few of them → Maximize Conversions without a target.
- Steady conversions, lead cost matters → Target CPA (tCPA).
- Order value is passed, profitability matters → Maximize Conversion Value or Target ROAS (tROAS).
Manual vs automated strategies
| Strategy | What it optimizes | Data it needs | Best for |
|---|---|---|---|
| Manual CPC | You set the cost per click | None | Tests, narrow niches, full control |
| Maximize Clicks | Clicks within budget | None | New accounts, gathering traffic |
| Maximize Conversions | Conversions within budget | Conversion tracking | First step into Smart Bidding |
| Target CPA | Conversions at a set average cost | Steady conversion flow | Lead generation |
| Maximize Conversion Value | Total conversion value | Conversions with values | Online stores |
| Target ROAS | Value per unit of spend | Enough valued conversions | E-commerce with varied margins |
In Google Ads, tCPA and tROAS are now often set as an optional target inside Maximize Conversions and Maximize Conversion Value. Interface names may change, but the logic stays the same.
Smart Bidding means Google sets a bid for every auction using signals such as device, time, location, audience and more. A manual strategy cannot use these signals at the same depth.
How much data you need
There is no universal threshold. Google gives guidelines in its help center, and they differ by campaign type. Practical rules:
- The more conversions in recent weeks, the more stable automation becomes.
- Conversions should be real goals: a lead, a call, a purchase. Not "page view" or "scroll".
- tROAS needs accurate values: the order amount, or ideally margin or revenue from your CRM.
- If conversions are scarce, combine similar campaigns with a portfolio strategy or optimize for a more frequent but still meaningful action.
The learning period
After you enable or significantly change a strategy, the campaign enters a learning period: the system gathers data and results may fluctuate. It is triggered by:
- changing the strategy type;
- a noticeable change to the CPA or ROAS target;
- changes to conversion actions;
- major changes to campaign structure.
During learning:
- Do not change settings every day.
- Account for conversion delay, since leads and purchases do not arrive right after the click.
- Adjust targets gradually, in small steps.
When to switch from Maximize Clicks to tCPA or tROAS
The switch makes sense when:
- conversions are set up and verified (a test lead arrives, no duplicates);
- the campaign steadily receives conversions, not occasional ones;
- you know your acceptable cost per lead or required return;
- the budget is large enough for the strategy to reach conversions.
A practical path: Maximize Clicks → Maximize Conversions without a target → once history builds up, set a CPA target close to your actual figure. For a store: Maximize Conversion Value → then a ROAS target.
Common bidding mistakes
- An overly aggressive target. A CPA far below actual or a ROAS far above it makes impressions collapse.
- Wrong conversions. Micro-goals or duplicates counted as primary teach the algorithm the wrong thing.
- Constant edits during learning.
- A small budget with a high CPA target leaves the strategy no room.
- The same value for every order in tROAS defeats the purpose.
- Judging by one or two days instead of full weeks.