Google Ads bidding strategies for B2B SaaS: which to use at each stage

Google Ads bidding strategies range from fully manual (you set every keyword bid) to fully automated Smart Bidding (Google's algorithm sets bids in real time based on predicted conversion probability). For B2B SaaS founders, the critical rule is: Smart Bidding strategies require conversion data to optimise effectively. Using Maximize Conversions or Target CPA before you have at least 30–50 conversions in your account gives Google's algorithm nothing to work with — it will spend your budget experimenting rather than optimising.

Stage 1 (0–30 conversions): Manual CPC or Maximize Clicks

In the first 4–8 weeks of a new campaign, before meaningful conversion data exists, use Manual CPC with Enhanced CPC enabled. Manual CPC lets you set bids by keyword, which gives you control over which keywords get budget. Enhanced CPC allows Google to adjust bids slightly based on conversion likelihood signals — a small improvement over pure manual. Alternatively, use Maximize Clicks to build traffic volume quickly while conversion tracking settles in. The goal in Stage 1 is to gather data, not to optimise for efficiency.

Stage 2 (30–100 conversions): Maximize Conversions

Once you have 30–50 conversions tracked in your campaign, switch to Maximize Conversions. This tells Google: use my daily budget to get as many conversions as possible. Google's algorithm now has enough data to identify patterns — what time of day, which device, which audience characteristics correlate with conversions — and adjusts bids accordingly. Don't set a Target CPA at this stage — let the algorithm optimise for volume first. After 30 more conversions at Maximize Conversions, evaluate your actual cost per conversion before setting a target.

Stage 3 (100+ conversions): Target CPA

With 100+ conversions, switch to Target CPA — tell Google what you're willing to pay per demo or signup. Set your Target CPA at or slightly above your actual average CPA from Stage 2 (to avoid starving the campaign of volume while it adjusts). Google will try to get conversions at or below your target while maximising volume. If your target is too low, impression share drops and volume falls. If it's too high, you're overpaying. Adjust Target CPA in 10–15% increments every 2 weeks based on actual vs target performance.

What about Target ROAS?

Target ROAS (Return on Ad Spend) requires you to assign monetary values to conversions — typically the deal value or average ACV. For B2B SaaS where deals close weeks or months after the initial click, ROAS attribution is difficult to implement accurately. Target CPA is more practical for most B2B SaaS campaigns because it targets a cost per conversion event (demo request) rather than a return on a revenue event that may not occur for months.