Target CPA, Target ROAS, Maximize Clicks — Google’s automated bidding strategies explained, plus when each actually works.
What Smart Bidding Actually Is
Smart Bidding is Google’s name for automated bid strategies that use machine learning to set bids per auction. Instead of one bid per keyword, Google adjusts bids in real time based on device, location, time of day, audience, browser, query intent, and dozens of other signals. It works best when fed enough conversion data: roughly 30+ conversions per month per campaign is a realistic minimum.
Maximize Clicks (TARGET_SPEND)
Maximize Clicks tries to spend your full daily budget on the cheapest available clicks that still match your keywords. Use it early in a campaign’s life to get traffic and collect conversion data, or on low-volume long-tail keywords where the auction is cold. Always set a CPC bid ceiling — without one, Google can silently spend $5–9 per click during a low-competition window.
Target CPA
Target CPA tells Google: ‘Get me as many conversions as possible at $X per conversion.’ It works well once you have 30+ conversions/month in a stable campaign. Set Target CPA based on your actual break-even, not aspiration — too low and Google will simply not spend. Expect 2–3 weeks of Target CPA being above your target as the model learns; if it never settles down, your conversion volume is too low or your landing pages can’t hit the CPA.
Target ROAS
Target ROAS is the revenue-weighted version of Target CPA: ‘Get me $X of revenue per $1 spent.’ Requires revenue values on your conversions (not just form fills). Ideal for ecommerce and any business with variable order values. Common rookie mistake: setting Target ROAS too high too early — Google responds by throttling impressions and the campaign dies. Start at your break-even ROAS and lower the target only as performance proves out.
Maximize Conversions / Conversion Value
Maximize Conversions gets as many conversions as your budget allows, ignoring CPA. It can burn budget fast in a low-conversion account — we’ve seen accounts hit $9 CPCs because Google had no conversion signal to anchor on. Only use Max Conversions once you have 50+ conversions/month and are comfortable with some volatility. Otherwise, pair it with a CPC bid ceiling or use Target CPA instead.
Which Strategy to Pick
New campaign with no conversion data: Manual CPC or Maximize Clicks with a tight bid ceiling. 30+ conversions/month and stable CPA: Target CPA. Ecommerce with revenue data: Target ROAS. Never run automated bidding without a bid ceiling on a new account — that’s how $200 days turn into $2,000 days. Review bidding monthly: strategies that worked three months ago may not match your current economics.
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