Quick answer: Choose Google Ads bid strategies by conversion volume: Maximise conversions first, target CPA once stable, conversion value when importing outcomes.
Your bid strategy tells Google how to compete for each search. Pick the wrong one and you either overpay for clicks that don’t convert or starve a campaign that could be working. The right choice depends mostly on one thing: how many reliable conversions your account gets.
For how Smart Bidding works under the hood, see Google Ads Smart Bidding explained. This guide is about choosing.
The main options
Manual CPC
You set the maximum you’ll pay per click for each keyword. Full control, lots of work, and you miss out on the signals Google uses (device, time, location, search context) to adjust bids per auction. Useful mainly for very small accounts or tightly controlled tests.
Maximise clicks
Google gets as many clicks as possible for your budget. Good for gathering data in a brand new account with no conversion tracking yet, but it doesn’t care whether clicks convert. Set a maximum CPC limit to avoid paying for expensive one-off clicks. Use for a few weeks at most.
Maximise conversions
Google aims to get as many conversions as possible within your budget. The usual starting point once conversion tracking works. It spends the full budget, so watch cost per conversion.
Maximise conversions with a target CPA
Same as above, but Google aims for an average cost per conversion you set. Add it once you have stable data (Google commonly suggests at least 15 to 30 conversions in the last 30 days). Set the target near your actual recent average, then lower it gradually.
Maximise conversion value (with optional target ROAS)
Google aims for the highest total conversion value, not the most conversions. For lead generation, this works when you assign different values to different conversions, for example $50 for a form submit, $300 for a qualified lead, $2,000 for a won job. It’s the most advanced option and the best fit once you import outcomes via enhanced conversions for leads.
Which to use at each stage
| Stage | Conversions per month | Strategy |
|---|---|---|
| Brand new, tracking not yet proven | 0 | Maximise clicks (with CPC cap) or Manual CPC, briefly |
| Tracking works, early data | Under 15 | Maximise conversions |
| Stable | 15–30+ | Maximise conversions with target CPA |
| Importing qualified leads or sales | 30+ with values | Maximise conversion value, then target ROAS |
Common mistakes
- Smart Bidding on bad conversion data. If you count page views or button clicks as conversions, Google optimises for those. Fix tracking first. See Google Ads conversion tracking.
- Target CPA set too low. The campaign stops spending. Start at your real average.
- Changing strategy every week. Each change triggers a learning period of roughly one to two weeks. Give it time.
- Budget too small for the target. If your target CPA is $80 and the daily budget is $30, Google can’t get enough conversions to learn. A rough guide is a daily budget of at least the target CPA, ideally several times it.
- Too many campaigns splitting data. Smart Bidding learns better with consolidated conversions. Consider portfolio bid strategies across similar campaigns.
Budget-limited campaigns and targets
From August 2026, Google changed how budget-limited campaigns behave with target-based strategies: they no longer systematically beat their target. In practice, if your campaign is limited by budget, Google won’t keep spending far below your target CPA. Set realistic targets and budgets together.
Sources and further reading
Written by Gregory
20 years building websites and running lead generation, mostly with my own money on the line. Based in Sydney, working with clients worldwide. How I work →