Google Ads help page now says Performance Max needs 15 conversions in 30 days for stable results

Google's Performance Max troubleshooting page now says a campaign needs at least 15 conversions over 30 days to reach stable performance. The line sits in the Google Ads Help article "Troubleshoot performance fluctuations and changes in Performance Max campaigns" (answer 12200334). Relevant Audience read the live page on 2 November 2026 and compared it with the archived copy from 8 June 2026, which has no conversion threshold at all. The page carries no date, so the exact day the wording went in is unknown.

What the Google Ads help page now says

The new text appears under reason 2 of the article, headed "Conversion tracking setup & conversion delay". It opens with the statement that Performance Max campaigns require minimum data for stable performance, and then gives the number: "Achieving stable performance requires at least 15 conversions over 30 days." The next sentence says that meeting this threshold helps ensure consistent spend and strong ROAS.

The same section keeps the older warning about tag health in shorter form. Sudden changes in global pings or tag fires affect serving, and that affects campaign spending for Smart Bidding. Google adds that timely conversion reporting supports campaign stability. A second paragraph covers delayed conversion data: advertisers may see spend spikes or low ROAS, and the page says the system can still stabilize and recover performance as the delayed data is processed.

You can read the full article on Google Ads Help.

How the page changed since June 2026

The table below compares the archived English copy captured by the Wayback Machine on 8 June 2026 with the live English page read on 2 November 2026.

So the 15-conversion line is one of several edits. Google rewrote reason 2, added a tenth reason about market demand, and added a paragraph explaining that Performance Max optimizes across the whole campaign rather than per channel.

The other nine reasons on the page

The threshold is easier to read in context. The live article lists ten causes of Performance Max fluctuations, and the conversion floor is only one of them.

1. Recent changes to account or campaign settings, including bid strategy, budget, conversion goals, audiences, location, language and ad scheduling.
2. Conversion tracking setup and conversion delay, now with the 15-conversion line.
3. Bids and bid targets set without regard to the historical data Google Ads uses.
4. Budget settings: limited budgets make fluctuations more likely.
5. Creative coverage and diversity across formats and surfaces.
6. Targeting settings and overlaps, such as narrow location or language targeting, or several campaigns entering the same auctions.
7. Policy and ad review status: any added or edited asset is re-submitted for policy review.
8. Other account issues, such as payments and billing transfers.
9. Auction dynamics, meaning choices other advertisers make in the same auctions.
10. External market shifts, checked with Google Trends.

For the new reason 10, the page gives two short playbooks. To correct overspending caused by a demand spike, it suggests negative keywords to block inefficient traffic, adjusting bid targets and tightening budget caps. To correct underspending when interest drops, it suggests broadening keyword targeting, expanding audiences and shifting budget toward other trending terms or products.

The page also tells advertisers to start with Explanations, the Google Ads feature that compares a selected date range with the previous period and points to likely causes of large changes. That instruction was already in the June copy.

What Google did not say

The new sentence is short, and several questions it raises have no answer on the page. Anyone planning changes around it should keep these gaps in mind.

• No date. Google help pages are undated. The June archive proves the line was absent then; the live page proves it is present now. Nothing narrower is established.
• No penalty stated. The page does not say that campaigns under 15 conversions stop serving, lose eligibility or are treated differently. It says stable performance requires the threshold. That reads as guidance about volatility, not a hard rule.
• No unit stated. The page does not say whether the 15 conversions are counted per campaign, per conversion action, per account or across a portfolio strategy. It also does not say whether only primary conversion actions count.
• No link to other Smart Bidding guidance. The page does not reconcile the figure with any other conversion guidance Google publishes for automated bidding.

Why a volume floor matters for Smart Bidding

Performance Max bids automatically toward the conversion goals the campaign uses. Every bid is a prediction of how likely a given impression is to lead to a conversion, and that prediction is trained on the conversions the account reports. With very few conversions in a month, each single conversion, or each missing one, moves the model more. That is a reasonable reading of why Google ties the threshold to "consistent spend" rather than to eligibility. This explanation is Relevant Audience's analysis of the mechanism, not wording from Google.

The same logic explains the second half of reason 2. If conversions arrive late, for example a lead form whose sale is only imported days later, the campaign sees spend without results for a while. Google's page says this can show up as spend spikes or low ROAS, and that performance can recover once the delayed data is processed.

What this means for Thai marketers

The checks below are Relevant Audience analysis for small and mid-sized Thai accounts. They are not Google instructions, and none of them is required by the help page.

1. Count what the campaign actually optimizes toward

Open the campaign's conversion goals and note which actions are primary. Then count those conversions for the last 30 days. If the number is below the line, at least you know which side of Google's stated threshold you are on before you judge a volatile week.

2. Fix tracking before touching strategy

Reason 2 is about setup as much as volume. Check that the tag fires on every thank-you page and every booking confirmation, that consent settings are not silently dropping conversions, and that a site redesign has not removed a tag. A sudden fall in tag fires looks to the bidder like a sudden fall in demand.

3. Measure your conversion delay

If sales close offline, through LINE chat or by phone, and are imported back into Google Ads, look at how many days pass between the click and the import. Long delays are the case Google's new paragraph describes. Shortening the import cycle, for example from monthly to weekly uploads, gives the bidder fresher data.

4. Consider consolidation

Two Performance Max campaigns with 8 conversions each sit below the figure; one campaign with 16 sits above it, if the 15 applies per campaign, which Google does not specify. Where products, margins and targets are similar enough to share one goal, merging campaigns or moving separate campaigns into asset groups under one campaign pools the data. Where targets genuinely differ, keep them apart.

5. Promote secondary actions only when they are real business goals

It is tempting to make a cheap action primary just to cross 15. That can backfire: Smart Bidding will chase whatever the campaign counts. An action such as a qualified booking request or a completed quote form may deserve primary status if it reliably leads to revenue. A page view, a scroll or a click on a phone number with no call behind it usually does not.

6. Check whether the budget can buy 15 conversions

As an illustrative calculation only: at a cost per conversion of 1,000 baht, 15 conversions in 30 days need about 15,000 baht of spend in that period. If the campaign's monthly budget is well below what its own cost per conversion implies, the threshold may be out of reach at any bid, and a different campaign type or a lower-funnel goal may be the more honest choice.

For help reviewing Performance Max setup, see Relevant Audience's Google Ads management service. If conversion tracking itself needs rebuilding, the GA4 and tracking setup service covers tags, consent and imports.

FAQ: Performance Max and the 15-conversion threshold

Does Performance Max require 15 conversions to run?

No, the help page does not say that. It says stable performance requires at least 15 conversions over 30 days, and that meeting the threshold helps ensure consistent spend and strong ROAS. It does not say campaigns below the figure stop serving.

When did Google add the 15-conversion line?

Google has not said. The line is absent from the Wayback Machine copy of 8 June 2026 and present on the live page read on 2 November 2026; Google help pages carry no change dates.

Is the threshold per campaign or per account?

The page does not specify. It also does not say whether secondary conversion actions or conversions from a shared portfolio strategy count toward the 15.

What should a small Thai account below 15 conversions do first?

Check tracking first, then volume. Confirm that tags fire correctly and that offline or delayed conversions are imported promptly, then look at whether consolidating campaigns or using a genuine higher-volume business goal would lift the count. This is Relevant Audience analysis, not Google guidance.

Does this apply to Google Ads accounts in Thailand?

The article is a global Google Ads Help page and names no country limits. Relevant Audience read the English version. The Thai-language version of the same article, checked on 2 November 2026, already lists 10 reasons, but its reason 2 still carries the older tag-fire wording without the 15-conversion line.

If your campaigns swing week to week, Relevant Audience can review the tracking, goals and structure with you.