Google Ads bidding strategy
Target CPA bidding is the most recommended and most misused strategy in Google Ads. Here's which strategy actually works at each budget level — and when to switch.
The bidding strategy that actually works
Target CPA bidding is the most recommended and most misused strategy in Google Ads. Agencies default to it, Google reps push it, and most tutorials treat it like the obvious choice. But for accounts spending under $3,000/month with fewer than 30 conversions, Target CPA actively hurts performance.
The reason is simple: Target CPA relies on conversion history to predict which clicks will convert. Without enough data, it's making blind bets. The result is either barely spending your budget (because the algorithm is too cautious) or burning through it on junk clicks (because it hasn't learned what a good click looks like).
We recommend a staged approach. Start simple, let the data accumulate, and upgrade your strategy only when you have the conversion volume to support it.
Which bidding strategy to use at every level
| Monthly conversions | Strategy | Why | When to switch |
|---|---|---|---|
| 0-15 | Maximize Clicks | You need traffic data. No algorithm can optimize conversions it hasn't seen yet. | When you hit 15+ conversions in 30 days |
| 15-30 | Maximize Conversions | Google has enough signal to chase conversions but not enough for cost targets. | When you hit 30+ conversions consistently |
| 30-50 | Target CPA | Enough data to predict costs. Set target at your actual average CPA, not your aspirational one. | When you have 50+ conversions and track revenue |
| 50+ | Target ROAS | Optimizes for revenue, not just conversion count. Best for e-commerce or variable deal sizes. | When it's working — don't fix what isn't broken |
Don't use Target CPA until you have 30+ conversions/month. Don't use Target ROAS until you have 50+. These aren't arbitrary numbers — they're the minimum volume Google needs to find statistical patterns in your conversion data.
Common bidding mistakes (with real dollar impact)
Setting a Target CPA below your average CPC. If your average CPC is $8 and you set a $10 Target CPA, you're telling Google it has roughly $2 of margin per click to find a conversion. That's a 1-in-1.25 click conversion rate — unrealistic for almost any industry. Google responds by barely spending your budget. We've seen accounts go from spending $100/day to under $5/day overnight because of this.
Switching strategies every 2 weeks. Every strategy change triggers a 1-2 week learning period where Google experiments with bids. If you switch from Target CPA to Maximize Conversions after 10 days because results looked bad, you just reset the clock. That account is now perpetually in learning mode. Commit to a strategy for at least 4 weeks before judging it.
Using your aspirational CPA, not your actual one. Your Target CPA should start at or slightly above your current average. If you're averaging $45/conversion and set a target of $25 because that's your dream number, Google will drastically cut volume to hit it — or fail and overshoot anyway. Start at $45, let the algorithm stabilize, then lower it by 10-15% at a time.
Layering manual bid adjustments on top of smart bidding. Target CPA and Target ROAS already factor in device, location, and time-of-day signals. Adding a +20% mobile bid adjustment on top of Target CPA doesn't stack the way you think — it conflicts with the algorithm and usually makes things worse.
Bid adjustments: when they still matter
Bid adjustments for device, location, and time of day still work with Manual CPC and Maximize Clicks. A law firm might bid +30% in its home city and -50% on mobile if phone leads from mobile don't convert.
But once you move to Target CPA or Target ROAS, most bid adjustments become redundant. These strategies already optimize per auction using the same signals. The exception is the -100% device bid adjustment, which fully excludes a device type — useful if mobile traffic genuinely doesn't convert for your business.
How Fullrun handles bid management
Fullrun follows the staged approach above automatically. New accounts start on Maximize Clicks. When conversion tracking data hits the right thresholds, it upgrades to Maximize Conversions, then Target CPA — each time setting targets based on your actual historical performance, not defaults.
It also catches the mistakes listed above before they cost you money: flagging impossible CPA targets, preventing strategy switches during learning periods, and monitoring daily for CPA spikes that need attention.
Frequently asked questions
- What bid strategy should I start with?
- Maximize Clicks. It sounds unsophisticated, but it gets traffic flowing so Google can learn which clicks convert. Once you hit 30 conversions in a 30-day window, switch to Maximize Conversions. Don't skip this step — jumping straight to Target CPA on a new campaign starves the algorithm of data and usually results in either near-zero spend or wildly expensive conversions.
- How often should I adjust my bids?
- With manual bidding, weekly — and only based on at least 7 days of data. With automated strategies, almost never. After changing your bid strategy, budget, or targeting, give the algorithm 2-4 weeks before touching anything. The learning period is real. Tweaking bids every few days resets it and guarantees worse performance.
- What does Target CPA mean?
- Target CPA tells Google the average you want to pay per conversion. Google then adjusts bids in each auction to hit that average over time. Key word: average. Some conversions will cost $15, others $45, but it should average to your target. The catch is that it only works with enough historical data — at least 30 conversions per month. Below that, Google is guessing.
- Is automated bidding always better than manual?
- No. Automated bidding needs data to work. If your account gets fewer than 15 conversions per month, you're better off with manual CPC or Maximize Clicks. Automated strategies also struggle in extremely niche markets with low search volume — there aren't enough auctions for the algorithm to learn patterns. That said, once you cross the 30-conversion threshold, automated almost always wins.
- How does Fullrun handle bidding?
- Fullrun follows a staged approach. New accounts start on Maximize Clicks to build conversion data. Once you hit 30 conversions in 30 days, it switches to Maximize Conversions automatically. When performance stabilizes, it layers on Target CPA with a target based on your actual data — not a guess. It also monitors for learning period issues, CPA spikes, and budget-to-bid mismatches daily.
Continue learning
The complete guide to Google Ads
Start from the beginning with how Google Ads works and how to set up your first campaign.
Conversion tracking setup
Your bid strategy is only as good as your conversion data. Get tracking right first.
Understanding Quality Score
Quality Score affects what you actually pay per click — even with automated bidding.
AI ads management vs. doing it yourself
Compare the cost and time savings of automated bid management.