Google Ads Bidding Strategies Explained: Which One Should You Use? (2026)

Google Ads Bidding Strategies: The 2026 Lineup

Google Ads now offers seven main bidding strategies. They split into two camps: Smart Bidding (the algorithm sets bids for you based on conversion data) and manual / semi-manual bidding (you retain more control).

Picking the wrong strategy is one of the most common — and most expensive — mistakes we see on audits. Target ROAS on a campaign with 10 monthly conversions is as wrong as Manual CPC on a campaign with 500.

Smart Bidding is not automatically better. It's better when it has enough data to make informed decisions. Below that threshold, it guesses.

Side-by-Side Comparison

Here's every Google Ads bidding strategy at a glance:

The rule of thumb: more data = you can afford less control. Below the data thresholds listed above, the algorithm doesn't have enough signal to outperform a competent human operator.

Smart Bidding Strategies Explained

Maximise Conversions

Google spends your full budget to get as many conversions as possible, at whatever CPA that produces. No target — just volume.

Best for: New campaigns that need to build conversion volume before moving to Target CPA or tROAS. Also useful when you want to scale aggressively and your CPAs are already healthy.

Watch out for: No cap on CPA, so a bad week can burn through budget with low-quality conversions. Review weekly and switch to Target CPA once you have 30+ conversions.

Target CPA (tCPA)

You set a target cost per acquisition. Google tries to hit that target across as many conversions as possible.

Best for: Lead-gen accounts where every conversion has roughly equal value (all leads cost the same to work, all demos cost the same to run).

Worked example: Your current CPA is £40. You set tCPA at £45 to let Google breathe. After 2–4 weeks of learning, conversion volume is up 20% and actual CPA is £42. Profit.

Maximise Conversion Value

Google spends your full budget to maximise total conversion value — not volume, not CPA, but pounds generated.

Best for: Ecommerce accounts with varied AOV, when you want to push growth and haven't yet nailed a ROAS target. A solid stepping stone before Target ROAS.

Target ROAS (tROAS)

You set a target ROAS (e.g. 4x). Google bids on each auction based on predicted return.

Best for: Ecommerce or subscription accounts with 50+ conversions/month and accurate conversion values. The gold standard for profit-focused advertisers.

Worked example: Current blended ROAS is 5x. You set tROAS at 4.5x (slightly below current). Google finds incremental volume at the margin, pushing total profit up even as reported ROAS drops slightly. Start loose; tighten gradually.

Manual and Semi-Manual Strategies

Manual CPC

You set a max bid for every keyword. Google never bids above that.

Best for: Brand campaigns where you want to cap costs, tiny accounts with inconsistent conversion volume, and diagnostic periods when you want to isolate campaign performance from algorithm behaviour.

Watch out for: It's labour-intensive to maintain at scale. For most accounts with >30 conversions/month, Smart Bidding materially outperforms.

Enhanced CPC (eCPC)

You set manual bids, but Google adjusts them up or down based on conversion likelihood. A halfway house between manual and Smart Bidding.

Best for: Transitional periods — you want Google's conversion signal helping but aren't ready to give up manual control. Quietly being deprecated; expect it to disappear within a few years.

Maximise Clicks

Google spends your budget to get the most clicks possible.

Best for: Rarely the right answer. Only useful for top-of-funnel awareness when conversions aren't the goal. For anything revenue-related, you're optimising for the wrong thing.

Which Strategy Should You Use? The Decision Tree

Here's how we pick bidding strategies for new campaigns:

1. Do you have accurate conversion tracking with values? If no, fix that before picking any Smart Bidding strategy. See our conversion tracking guide.
2. Do you have 30+ conversions in the last 30 days on this campaign? If no, start with Maximise Conversions to build volume. Revisit in 4 weeks.
3. Is the value of each conversion roughly the same? If yes, use Target CPA. If no (varied AOV), move to step 4.
4. Do you have 50+ conversions in the last 30 days? If yes, use Target ROAS. If no, use Maximise Conversion Value until you hit the threshold.
5. Is this a brand campaign? Consider Manual CPC or Maximise Clicks — brand has unlimited ROAS so tROAS can under-bid. Alternatively, ring-fence brand with a separate tROAS (e.g. 15x) that actually constrains spend.

Common Bidding Strategy Mistakes

• Setting targets too aggressively. A tROAS of 10x on a campaign historically at 4x will choke volume. Start within 10% of current performance and tighten over time.
• Changing strategies before the learning period ends. Smart Bidding needs 7–14 days to stabilise after changes. Don't panic-revert on day 3.
• Using tROAS with bad conversion values. If you're sending inaccurate values (hardcoded leads, no currency data) to Google, tROAS optimises for fiction.
• Applying the same strategy to brand and non-brand. Brand has 15–50x ROAS naturally; non-brand 3–5x. Same target across both produces over-bidding on brand and under-bidding on non-brand.
• Ignoring budget constraints. If a tROAS/tCPA campaign is "limited by budget," the strategy can't fully optimise. Either raise the budget or loosen the target.

When to Switch Bidding Strategies

Bidding strategy isn't a one-time decision. Re-evaluate when:

• Conversion volume crosses a threshold (above 30/mo = ready for tCPA; above 50/mo = ready for tROAS)
• Your cost per conversion stabilises and you're ready to hold it to a target
• You add or improve conversion tracking (more signal = Smart Bidding gets smarter)
• Business goals shift (volume → efficiency; growth → profit)
• Performance plateaus for 60+ days with no obvious cause — sometimes a strategy change breaks the stalemate

Plan one strategy migration per month, not per week. And always keep enough historical data to evaluate whether the change helped — a 14-day learning period + 14-day evaluation = 4 weeks minimum between changes.