The Five Smart Bidding Strategies
Maximize Conversions: spends budget to get most conversions. No CPA target.
Target CPA (tCPA): targets specific cost per conversion.
Maximize Conversion Value: spends budget to maximise revenue.
Target ROAS (tROAS): targets specific return on ad spend.
Enhanced CPC: manual CPC with Google's AI adjusting up to ±30%.
When to Use Each (Decision Tree)
Just starting + few conversions: Manual CPC or Enhanced CPC.
15-30 conversions/month + want growth: Maximize Conversions.
30+ conversions + want efficiency: Target CPA.
30+ conversions with revenue tracking + e-commerce: Target ROAS.
100+ daily conversions + scale priority: Max Conv Value.
How to Switch to Smart Bidding Safely
Step 1: ensure conversion tracking is rock solid (no double-counts, all key actions tracked).
Step 2: start with Maximize Conversions for 14 days to baseline.
Step 3: switch to tCPA at +20% of your actual CPA over those 14 days.
Step 4: lower target by 10% every 2-3 weeks if performance holds.
Common Smart Bidding Failures
Switching to tCPA with <15 conversions/month — algorithm has insufficient data.
Targets set unrealistically low — algorithm pulls back spend instead of finding conversions.
Changing target +/- 30%+ in one move — pauses learning period and tanks performance.
Ignoring search terms — Smart Bidding can broaden match dramatically.
When to Stay with Manual Bidding
You have <100 conversions/month and want tight control.
You're learning the platform and need to understand the bid-keyword relationship.
You're testing very narrow audience/keyword segments where AI might overcorrect.
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Frequently Asked Questions
Is Smart Bidding better than manual bidding?
Above a certain conversion volume threshold (30+/month) — yes, typically. Below that, manual control wins. Above 100+ conversions/month, Smart Bidding usually outperforms human managers.
How long does Smart Bidding take to learn?
Google says 1-2 weeks. Reality: 3-6 weeks for the algorithm to stabilise after a meaningful change. Patience required.
Can I use Smart Bidding with a small budget?
Difficult below ₹500/day or 30 conversions/month — the algorithm doesn't have enough data. Use Enhanced CPC or Maximize Clicks until you cross the threshold.
Which is best: Target CPA or Maximize Conversions?
Maximize Conversions for growth-phase or learning-phase campaigns. Target CPA for mature campaigns where you have a clear CPA constraint. Both can be effective with proper conversion tracking.