Google Ads Bidding Strategies: Manual vs Smart Bidding

Enhanced CPC modifies your manual bids up or down (up to 30%) based on Google's likelihood prediction for each auction. It is a hybrid between manual and full automation — you maintain base bid control while getting some Smart Bidding optimization. Good for accounts with 10–30 monthly conversions not yet ready for full Target CPA.

When you switch to a Smart Bidding strategy or make significant changes, Google enters a learning period of approximately 1–2 weeks during which it collects data and adjusts the algorithm to your account. During this time, performance may fluctuate. What to avoid: changing your target CPA/ROAS, pausing campaigns, changing budget significantly, or adding/removing many keywords. Any of these resets the learning period. Monitor but do not over-react to short-term fluctuations. The learning period indicator appears in the campaign status column. Wait until learning is complete before evaluating Smart Bidding performance.

Setting Target CPA correctly: (1) Look at your historical CPA over the last 30 days — what have you actually been achieving? (2) Set initial Target CPA 10–20% above your historical average CPA. This gives Google bidding room to win enough auctions while still optimizing. (3) Do not set a Target CPA far below your historical CPA immediately — Google will reduce volume dramatically trying to hit an unrealistic target, (4) Once stable on initial target, lower by 5–10% every 2–3 weeks while maintaining acceptable conversion volume. For new campaigns with no history: set a Target CPA based on your acceptable CAC (Customer Lifetime Value ÷ 3 as a starting benchmark) and let the campaign run 4–6 weeks to find equilibrium.

Target ROAS (Return on Ad Spend) instructs Google to optimize bids to achieve a specific revenue multiple from your ad spend. Formula: Target ROAS = Revenue Goal ÷ Ad Spend × 100. Example: 400% Target ROAS means you want ₹4 revenue for every ₹1 spent. Requirements: (1) Minimum 30–50 conversions with revenue values tracked per month, (2) Conversion tracking must pass revenue values (not just count conversions), (3) Revenue values should reflect actual product prices or lead values. Best for: e-commerce with product price data and SaaS with clear MRR values. Avoid tROAS for lead generation without estimated lead values — use Target CPA instead.

Maximize Conversions tells Google to spend your full daily budget to get as many conversions as possible, with no specific cost-per-conversion target. Useful for: (1) New campaigns needing to accumulate conversion data quickly before switching to Target CPA, (2) Campaigns with flexible CAC tolerance where volume matters more than efficiency, (3) Time-limited promotions where you want to exhaust budget during the promotion window. Caution: without a Target CPA constraint, Maximize Conversions can spend your entire budget on low-quality conversions to hit volume. Add a Maximum CPC bid limit if cost efficiency matters. Review CPA actively and add Target CPA once you see your actual average CPA from the first 2–4 weeks.