Google Ads Data & Measurement Updates: What Changed in September 2026

What Google announced

On 10 September 2026, Nipoon Malhotra (VP, Ads Analytics, Insights and Measurement at Google) published an update to Google's measurement suite. The announcement is framed around a three-part idea: a strong data foundation to feed AI, more signals to see the full picture, and causal proof to tie spend back to real revenue. Everything below sits in one of those three buckets, which is why the changes matter more than a typical feature round-up - each one alters how budget decisions get justified, not just what the reporting screens look like.

• Data Manager is being integrated directly into Google Analytics and Display & Video 360, so first-party data can be managed and activated across those tools.
• Enhanced conversions are being added to Google Analytics and DV360 to match customer data securely and improve ad relevance.
• The Data Manager API is now universal and is built on the IAB Tech Lab's Event and Conversions API (ECAPI) standard.
• New built-in diagnostics in Data Manager can identify and surface data problems before they damage campaign performance.
• A new Data Strength Uplift metric reports the additional conversions recovered by a first-party data setup.
• Meridian, Google's open-source marketing mix model, gained agentic capabilities, brand-signal inputs and general availability for Meridian GeoX.

The figures Google published

Google attached its own measured numbers to this release. They are Google's averages across its internal datasets, not ADZBE client results, and they should be read as directional rather than as a promise for any single account:

• Advertisers connecting offline and app data to Data Manager see an average 26% increase in incremental ROAS (Google Data, Global, Measurement, April 2025 - April 2026, Search campaigns bidding to conversion value).
• Advertisers using enhanced conversions see an average 11% increase in Search conversions compared with standard conversion imports (Google Internal Data, Jan 1 - Jan 14, 2026).
• Advertisers using Google tag gateway observe an average 14% conversion uplift, and over 20% uplift on Demand Gen campaigns (Google Internal Data, 2024-2025 and June 2026).

What this means for an advertiser running Google Ads

The Data Manager API being universal is the part most likely to change day-to-day work. Because it follows the IAB ECAPI standard, the same first-party pipeline can now feed Google alongside other ad platforms instead of being rebuilt per channel. For an advertiser already running Meta and LinkedIn alongside Search, that removes a recurring engineering cost and makes cross-platform audience and conversion handling consistent.

• If you are still importing conversions as flat files, enhanced conversions is the migration to prioritise - it is the one Google directly ties to Search conversion volume.
• If offline outcomes matter (calls, appointments, showroom visits, WhatsApp enquiries), Data Manager is now the supported route rather than a workaround.
• The new diagnostics are worth running deliberately. A silent tracking gap usually shows up as a performance problem weeks later, and catching it earlier is cheaper than diagnosing it during a budget review.
• The Data Strength Uplift metric answers a question agencies often cannot: how many conversions did the measurement setup itself add, rather than the campaigns producing them.

Where Meridian and GeoX fit

Meridian is the harder sell for a small or mid-sized advertiser, and it is worth being blunt about that. It is an open-source marketing mix model, so it is free to run, but it needs enough conversion volume and clean data to produce a model you can trust. It becomes genuinely useful once you are running multiple channels and need to defend a budget split, because it answers which channels are actually creating incremental demand rather than which ones are correlated with sales. Meridian GeoX is the causal counterpart: instead of modelling, it runs geo-based experiments to measure lift directly. Google moved GeoX to general availability globally in this release, which removes a previous adoption barrier.

A practical sequence

If you want to act on this without disrupting live campaigns, the order below is deliberately conservative. Each step is verifiable on its own, so you can stop if it does not earn the next one.

• Audit current conversion tracking first, and write down what is actually being recorded today. You cannot improve a measurement baseline you have not measured.
• Migrate any standard conversion imports to enhanced conversions, and compare Search conversion volume before and after over at least four weeks.
• Connect offline or app outcomes through Data Manager rather than ad-hoc uploads.
• Run the Data Manager diagnostics and fix anything reported before touching budget.
• Only once the above is stable, consider Meridian or a GeoX experiment - and only if there is enough conversion volume to model credibly.

What this does not mean

None of Google's figures guarantee a comparable uplift for your account. They are platform-wide averages drawn from specific date ranges and campaign types, published by the vendor that sells the product. Treat them as evidence that the feature direction is sound, not as a forecast. Likewise, none of the measurement improvements do anything for an account whose tracking is already broken - which is why step one above is auditing rather than installing.