Meta Says Advantage+ Improves Cost Per Conversion by 9%. Read the Footnote

In short

Meta states that “advertisers who used Advantage+ sales campaigns saw 9% improvement in cost per conversion, on average.”

Meta also publishes the methodology directly beneath it, and the footnote is more informative than the headline: the test “was run globally and across-verticals for 1 week starting December 3 2024 within sales objective. A statistical simulation framework gave a 90% statistical confidence that A+SC outperforms constrained campaigns by driving cost-effective conversion.”

What the footnote actually constrains

Four things, each of which matters before you apply the 9% to your own forecast.

One week. A seven-day measurement window cannot separate a durable efficiency gain from a favourable week. It also cannot observe the learning phase completing, which Meta elsewhere documents as taking roughly 50 results — for many advertisers, more than a week.

Starting December 3, 2024. That is peak Q4 auction. Competitive dynamics, creative fatigue rates and conversion rates in that window are not representative of February. A result measured there generalises to Q4 more confidently than to the rest of the year.

90% confidence, via simulation. Conventional reporting thresholds sit at 95%. Ninety per cent is a lower bar, and “a statistical simulation framework” is not the same as a randomised controlled experiment. This is a defensible way to estimate an effect and it is weaker evidence than a lift test.

Against “constrained campaigns”. The comparison is Advantage+ versus campaigns with manual constraints applied. That is the relevant comparison for the decision — but it means the 9% is a relative figure whose size depends on how well the constrained campaigns were run. Against a well-run manual setup the gap is presumably smaller; against a poorly run one, larger.

None of this makes the number false. It makes it a directional finding from a short Q4 window at 90% confidence, which is a different object from “Advantage+ will cut your CPA by 9%”.

The honest way to use it

Treat it as evidence that Advantage+ is worth testing, not as a forecast. The test is cheap and the only measurement that answers the question for your account is your own.

Meta’s documented conditions for keeping Advantage+ on are specific and worth getting right before you measure anything:

That last row is the one that silently invalidates tests. An account that believes it is running Advantage+ while using ad set budgets across multiple ad sets is not, and will measure the wrong thing.

The feature that was withdrawn

Meta documents that the existing customer budget cap — which let Advantage+ sales advertisers set a maximum percentage of budget spent on existing customers — is no longer available.

Meta publishes a manual replication: build the campaign with two ad sets under a campaign budget. Ad set 1 targets existing customers with an ad-set spending limit set as a daily or lifetime maximum, either as a percentage or in US dollars; Meta notes “a percentage amount will scale, but US dollars will remain static”. Ad set 2 excludes the same custom audiences and takes the remainder. Same creative in both.

Any guide describing the budget cap as a live setting predates this change. It is a good example of why platform content needs dated claims rather than a refreshed timestamp.

Interpretation boundary

The 9% figure, its methodology footnote and the budget-strategy conditions are all Meta’s own, retrieved on 2026-09-22, and Meta revises this documentation without notice. Meta separately cautions that opportunity score “does not reflect your actual or future performance”. A vendor-published result on a vendor-favourable comparison is worth reading and is not a substitute for a holdout test in your own account.

Can software help?

Bach.ai audits your connected Meta account, estimates the revenue impact of what it finds, and proposes specific fixes. It applies a change only after you approve it. Think of it as an automated audit layer that surfaces issues and proposed fixes for your review — not a replacement for your team’s judgment, and creative production is not its core job, though the Pro and Agency plans can generate a limited number of variants.

FAQ

How much better are Advantage+ sales campaigns?

Meta publishes a 9% average improvement in cost per conversion. Its own footnote records a one-week test starting December 3 2024, run globally within the sales objective, with 90% confidence from a statistical simulation framework.

Is Meta’s 9% Advantage+ figure reliable?

It is directional. One week cannot separate a durable gain from a good week, early December is peak Q4 auction, 90% confidence is below the conventional 95% threshold, and a simulation framework is weaker evidence than a randomised lift test.

When does Advantage+ turn off without me noticing?

When a campaign has multiple ad sets and is not using campaign budget. Meta documents that campaign budget keeps Advantage+ on with single or multiple ad sets, including with optional spending limits.

Can I still cap spend on existing customers in Advantage+?

Not as a setting — Meta has withdrawn the existing customer budget cap. Meta documents a manual replication using two ad sets under a campaign budget, with an ad-set spending limit on the existing-customer set.

Method and sources

“Meta publishes a 9% average improvement in cost per conversion.”

Source: Meta Business Help Centre, retrieved 2026-09-22:

• https://www.facebook.com/business/help/1362234537597370
• https://www.facebook.com/business/help/1602924913861363
• https://www.facebook.com/business/help/1142614290190459

Meta’s documentation changes without notice and these thresholds have moved before — verify anything load-bearing against the current version of the article before you act on it.