Need advice on which bidding strategy to use for Google ...

Choosing the wrong bidding strategy in Google Ads isn't just a minor inconvenience — it can quietly drain your budget for weeks before you even realize something's off. As a practitioner who has managed over $350M in Google Ads spend across hundreds of accounts, I can tell you that bidding strategy selection is one of the highest-leverage decisions you'll make in any campaign. Get it right, and Smart Bidding does the heavy lifting. Get it wrong, and you're fighting an algorithm that's working against you with bad data.

Why Bidding Strategy Selection Is More Complex Than Google Lets On

Google's interface makes bidding strategy selection look deceptively simple — a dropdown, a target CPA or ROAS input, and you're off. But what the UI doesn't tell you is that each strategy has a readiness threshold, an optimization window, and a specific use case where it genuinely excels. Slapping Target CPA on a brand-new campaign with zero conversion history isn't optimizing — it's guessing, and you're letting an algorithm guess on your behalf.

A common question in the r/PPC community is exactly this: "What bidding strategy should I use, and when?" The answers vary wildly depending on campaign maturity, conversion volume, budget constraints, and business goals. Let's break it down systematically.

The Bidding Strategy Spectrum: From Manual Control to Full Automation

Think of Google's bidding strategies on a spectrum. On the left, you have complete manual control. On the right, full automation. Neither extreme is universally correct — the right position depends on your campaign's data maturity and your tolerance for algorithmic risk.

Phase 1: New Campaigns With No Conversion History

If you're launching a brand-new campaign — or running in an account that has fewer than 15 tracked conversions — this section is for you. This is where most practitioners make their first big mistake: reaching for Target CPA or Target ROAS before the algorithm has any meaningful signal to work with.

Start With Manual CPC or Maximize Clicks

For new campaigns, Manual CPC gives you full control over where your money goes while you gather data. Yes, it's more hands-on, but it prevents the algorithm from making expensive guesses in a data vacuum. Set conservative bids based on your estimated CPA goal and keyword competition, then monitor search term reports daily in the first two weeks.

Alternatively, if your primary goal in week one is driving traffic volume to test landing pages or understand search behavior, Maximize Clicks with a max CPC cap is a reasonable choice. The cap is non-negotiable — without it, you'll find Google happily spending $40 per click on tangentially related terms.

Setting Up Conversion Tracking First — Not Later

This sounds obvious, but it needs to be said: conversion tracking must be live and verified before you choose any Smart Bidding strategy. As practitioners often discuss in the r/PPC community, "set up conversion tracking ASAP" is the most repeated advice for a reason. Without it, you're flying blind, and transitioning to any automated strategy later becomes far more painful when you realize your historical data is incomplete.

Make sure you're tracking the right conversion actions. Micro-conversions (page views, time on site) should be informational only — not your primary bidding signal. Primary conversions should be revenue-driving actions: form fills, purchases, phone calls with a minimum duration, quote requests.

Phase 2: Scaling Up — When to Transition to Smart Bidding

Once your campaign starts generating consistent conversion data, you're ready to introduce automation. But the timing matters enormously.

The 15–30 Conversion Threshold for Maximize Conversions

The r/PPC community commonly cites 15–20 conversions as the minimum threshold to shift to Maximize Conversions, and from my experience managing large-scale accounts, I'd put the practical minimum at 20–30 conversions per month at the campaign level. Below that, the algorithm is still heavily interpolating — making predictions based on very thin data.

Maximize Conversions (without a Target CPA attached) is your best first step into Smart Bidding. It gives Google latitude to find converting users while you observe where CPA lands naturally. Run it for 4–6 weeks before drawing conclusions. Resist the urge to make bid adjustments manually — you'll interfere with the learning period.

Adding a Target CPA: Don't Do It Too Early

Once you've run Maximize Conversions for 4–6 weeks and have a clear picture of your actual CPA, you can layer in a Target CPA. The critical rule here: set your initial Target CPA at or slightly above your observed average CPA. If your actual CPA has been running at $85, don't enter $50 as your target hoping to muscle the algorithm into efficiency — you'll just cut your impression share and starve the campaign.

A good rule of thumb for initial Target CPA entry:

1. Calculate your average CPA over the last 30 days from Maximize Conversions
2. Set Target CPA at 100–110% of that figure initially
3. Reduce by 5–10% every 2–3 weeks as performance stabilizes
4. Stop reducing when volume starts dropping unacceptably

Phase 3: Mature Campaigns and ROAS-Based Bidding

For ecommerce campaigns or any setup where you're passing revenue values back to Google, Target ROAS and Maximize Conversion Value are your most powerful long-term tools. But they come with the highest data requirements.

Target ROAS: The 50-Conversion Rule

Google officially recommends at least 50 conversions with revenue data in the past 30 days before switching to Target ROAS. In practice, I'd push that to 75–100 for accounts where ROAS fluctuates seasonally or product prices vary significantly. Below 50 conversions, the algorithm lacks enough signal on revenue distribution to optimize meaningfully.

When setting your initial Target ROAS, follow the same logic as Target CPA: start near your observed average ROAS, not your aspirational ROAS. If your account has been delivering 320% ROAS on Maximize Conversion Value, entering 600% as your Target ROAS will likely collapse your traffic.

Portfolio Bidding: Often Overlooked, Frequently Underused

If you're managing multiple campaigns targeting similar audiences or products, Portfolio Bid Strategies let you pool conversion data across campaigns, effectively lowering the threshold for Smart Bidding eligibility. A portfolio of 3 campaigns each generating 20 conversions/month behaves much more like a single campaign with 60 conversions — enough to run Target CPA reliably.

Special Scenarios: When Standard Advice Doesn't Apply

Not every campaign fits neatly into the standard maturity curve. Here are the edge cases I encounter most frequently.

Low-Volume B2B Campaigns

B2B accounts generating fewer than 20 conversions per month are notoriously difficult to automate effectively. In these cases, Manual CPC with eCPC enabled is often the most reliable approach for an extended period — sometimes indefinitely. The alternative is to expand what you count as a conversion: use qualified lead form submissions, demo requests, AND phone calls together to bulk up your signal. Just make sure each action is genuinely valuable before including it in your bidding target.

Seasonal Businesses With Volatile Conversion Rates

For businesses with sharp seasonal peaks (think: tax preparation, holiday retail, HVAC), Smart Bidding can struggle at the edges of seasons when historical patterns shift rapidly. During ramp-up periods, be prepared to temporarily override your Target CPA or ROAS with Maximize Conversions to let the algorithm adapt, then reintroduce targets once the season stabilizes.

Brand Campaigns

Brand campaigns almost always have dramatically different conversion rates and CPAs than non-brand campaigns. Mixing them together under a single bidding strategy almost always distorts performance. Keep brand and non-brand in separate campaigns, managed under separate bidding strategies, with separate targets. This is one of the most impactful structural decisions in any account.

Managing the Learning Period Without Losing Your Mind

Every time you switch bidding strategies, change your Target CPA by more than 15–20%, or make significant structural changes to a campaign, Google enters a learning period. During this time (typically 1–2 weeks, sometimes up to 4 weeks for lower-volume campaigns), performance often gets worse before it gets better.

Here's how to manage this without panicking or making hasty changes that reset the clock:

• Don't evaluate performance during the learning period — use it to observe, not decide
• Avoid major changes during learning — pausing keywords, adjusting budgets by more than 20%, or changing bids manually will restart the period
• Set internal expectations with stakeholders — if a client or manager is watching daily dashboards, they need to know a "bad week" may be structural, not strategic failure
• Document your change log — knowing exactly when a strategy switch happened is essential for isolating performance cause and effect in your data
• Monitor impression share and search lost IS (budget) during learning — sudden drops often signal the algorithm is under-bidding as it recalibrates

What to Do Next: Your Bidding Strategy Action Plan

Here's a concrete, sequenced plan based on where your campaign is right now:

1. Audit your conversion tracking immediately. Verify that your primary conversion actions are firing correctly, that values are passing through (for ecommerce), and that micro-conversions are set to "Secondary" — not influencing bids.
2. Match your strategy to your data maturity. If you have fewer than 20 conversions in the last 30 days, stay on Manual CPC or Maximize Clicks. Don't rush Smart Bidding before the data is there.
3. Transition to Maximize Conversions at 20–30 monthly conversions and run it for a full 4–6 weeks before evaluating or adjusting targets.
4. Introduce Target CPA or Target ROAS conservatively — start at or above your observed average, document the change date, and reduce targets gradually over time as efficiency improves.
5. Separate brand from non-brand — if you haven't done this yet, it's the single highest-impact structural change you can make today, regardless of which bidding strategy you're running.

Bidding strategy optimization isn't a one-time decision — it's a continuous process of matching your automation level to your data quality. The campaigns that perform best over time aren't the ones that chased the newest Google feature. They're the ones built on clean conversion data, sound campaign structure, and a disciplined, sequential approach to automation. Nail those fundamentals first, and the strategy selection gets a lot easier.