Choosing the wrong bidding strategy is more harmful than choosing the wrong keywords. Many teams set all their campaigns to maximize conversions, only to find that their budgets are exhausted and there are very few conversions. The question is not whether the strategy itself is good, but whether it is suitable for the stage of your current account.
The underlying logic of Google bid strategies
All smart bidding strategies in Google Ads essentially use historical conversion data to train predictive models. Accounts with less data are less suitable for smart bidding - the algorithm does not have enough samples, and it is like asking someone who does not understand your business to negotiate for you, which can easily lead to problems.
Core principles for choosing a bidding strategy:The amount of data determines the strategy choice, not the goal.
Manual CPC: Best for the data accumulation period
Manual CPC gives complete bidding control to the advertiser and is suitable for use when the data is not sufficient.
Applicable scenarios: New account (fewer than 30 conversions in the past 30 days); limited budget and need to maximize control accuracy; a campaign has just been restructured and needs to re-accumulate data.
Practical suggestions: Use manual CPC to accumulate data in the first 3-4 weeks of a new account; at the same time, ensure that conversion tracking is accurate, otherwise subsequent switching to smart bidding will be in vain; keyword bidding refers to Google's recommended bidding range, and there is no need to pursue the highest exposure share in the early stage.
Target CPA (tCPA): Control cost per conversion
Target CPA allows Google algorithms to automatically adjust bids with the goal of maximizing conversions within a set CPA.
Applicable scenarios: The account has 30+ conversions in the past 30 days, and the conversion data is stable; the business has a clear target cost (such as no more than $50 per inquiry).
Key parameter settings: Don't set your target CPA too aggressively. It is recommended to set it to 1. 2-1. 5 times the actual value to give the algorithm enough space, and then gradually tighten it.
A certain B2B SaaS team's inquiry CPA actual value was $80, and the target CPA was set to $60. As a result, the traffic shrank by 70% in an instant. After adjusting to $100, the inquiry volume doubled two months later, and the actual CPA naturally dropped to $65. The goal is to leave room for the algorithm. Rushing to lower CPA is counterproductive.
Maximize conversions: Tools to increase volume quickly
Maximize Conversions lets the Google algorithm get as many conversions as possible within your budget, without setting a CPA cap.
Applicable scenarios: The budget is sufficient, and the core goal is to obtain more conversions; new promotions need to be launched quickly; cooperate with TROAS to expand e-commerce advertising.
Common misunderstandings: Confuse maximizing conversions with maximizing clicks - maximizing clicks only brings traffic regardless of conversions, and the two goals are completely different. Additionally, if there are issues with conversion tracking (such as double counting), maximizing conversions will amplify the error signal.
Target ROAS (tROAS): Profit guarantee for e-commerce advertising
Target ROAS allows the algorithm to maximize conversion value within a set return on ad spend, which is especially suitable for cross-border e-commerce merchants with clear GMV goals.
Prerequisites: At least 50 valuable conversions in the past 45 days; conversion value tracking is accurate (order amount correctly passed back to Google).
suggestion: The ROAS target is initially set to 80% of the actual value, and then gradually increases after stabilization. An excessively high ROAS target will make the algorithm extremely conservative and traffic will shrink sharply.
Bid strategy selection guide
| Account stage | Recommended strategy | switching signal |
|---|---|---|
| Cold start (0-30 days) | Manual CPC | > 30 conversions per month |
| growth period | Target CPA | Tighten targets after CPA stabilizes |
| Mature stage (e-commerce) | Target ROAS | Continuously optimize feed quality |
| Rapid volume increase | Maximize conversions | Evaluate performance after budget is exhausted |
