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Smart Bidding

Définition

Smart Bidding is a subset of Google Ads automated bid strategies that use machine learning to optimize for conversions or conversion value in every auction. It includes Target CPA, Target ROAS, Maximize Conversions, and Maximize Conversion Value, using real-time signals like device, location, time, and audience to set optimal bids.

How Smart Bidding Works

Smart Bidding processes hundreds of contextual signals at auction time that would be impossible to manage manually. These signals include device type, geographic location, time of day, remarketing list membership, browser, operating system, demographics, and the actual search query. The algorithm predicts the likelihood of conversion for each individual auction and sets a bid accordingly. This happens in milliseconds and adjusts for every single impression opportunity, far beyond what manual optimization can achieve.

Smart Bidding Strategies Explained

Target CPA sets bids to achieve your desired cost per acquisition. Target ROAS sets bids to achieve your desired return on ad spend. Maximize Conversions gets the most conversions within your budget without a CPA constraint. Maximize Conversion Value gets the most revenue within your budget without a ROAS constraint. Each strategy works best in specific contexts: use Target CPA for lead gen, Target ROAS for e-commerce, and the Maximize variants when you want to spend your full budget aggressively.

Prerequisites for Smart Bidding Success

Smart Bidding requires accurate conversion tracking as its foundation. Without reliable conversion data, the algorithm optimizes toward noise. Google recommends at least 30 conversions in the last 30 days for Target CPA and 50 conversions with value data for Target ROAS. Conversion actions should have consistent attribution windows and not include micro-conversions mixed with macro-conversions. Set realistic targets based on historical performance: setting a Target CPA 50% below your current average will starve the algorithm of data.

Smart Bidding Analysis with AdWhiz

AdWhiz evaluates whether your account is ready for Smart Bidding based on conversion volume, data quality, and tracking accuracy. The audit identifies campaigns that could benefit from upgrading to Smart Bidding and flags ones where data is insufficient. For accounts already using Smart Bidding, AdWhiz monitors performance against targets and identifies when targets need adjustment or when the algorithm is underperforming due to data issues or overly aggressive goals.

Foire aux questions

All Smart Bidding is automated bidding, but not all automated bidding is Smart Bidding. Smart Bidding specifically refers to conversion-based strategies (Target CPA, Target ROAS, Maximize Conversions, Maximize Conversion Value). Maximize Clicks is automated but not Smart Bidding because it does not optimize for conversions.

The learning period typically lasts 1-2 weeks, during which performance may fluctuate. Google labels campaigns as 'Learning' during this phase. Avoid making major changes during the learning period as it resets the algorithm. After learning completes, evaluate performance over 2-4 weeks before adjusting targets.

Smart Bidding can work with small budgets if you have enough conversions. The critical factor is conversion volume (30+ per month), not budget size. A small-budget campaign with high conversion rates may outperform a large-budget campaign with sparse conversions. Start with Maximize Conversions before adding CPA targets.

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