Google Ads Health

GA4 vs Google Ads Discrepancy Explainer

Your GA4 and Google Ads conversion counts don’t match — enter both numbers and a few yes/no answers to get a ranked, plain-English explanation of why.

How to use

Enter both totals

Add your GA4 conversion count and your Google Ads conversion count for the same date range.

Answer a few yes/no checks

Enhanced conversions, Consent Mode, auto-tagging and offline imports all change which number is "right".

Get a ranked explanation

The likeliest causes for your specific mismatch, ranked, in plain English.

GA4 conversions (this date range)

Google Ads conversions (same date range)

Google Ads conversion window (days)

Tick what's true for your setup Auto-tagging (gclid) is ON in Google Ads Enhanced Conversions is turned on Consent Mode v2 is live (EEA/UK traffic) Google Ads count includes call/offline imported conversions Google Ads count includes view-through conversions Checkout/booking happens on a DIFFERENT domain to the one GA4 is installed on GA4 conversion event = the same action as the Google Ads conversion action

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Enter both totals to compare

Likeliest causes, ranked

What we check

Whether the GA4 event and the Google Ads conversion action are genuinely the same user action — the single most common root cause when they are not.
Consent Mode v2 modelled conversions, offline/call-imported conversions, and view-through conversions — three things Google Ads counts that GA4 structurally cannot see.
Conversion window length versus GA4’s session-based lookback, auto-tagging (gclid) status, cross-domain tracking configuration, and whether Enhanced Conversions is enabled.
Ranks the likeliest cause(s) for YOUR specific direction of mismatch — Ads higher than GA4 and Ads lower than GA4 point to different, non-overlapping causes.

Related tools

UTM Validator + Governance Linter — Tagging errors are a common, checkable contributor to a mismatch
Enhanced Conversions Readiness Checker — One of the factors this explainer checks, scored in full
Consent Mode v2 Live Validator — Confirm the Consent Mode signals this tool asks you about are actually live

Last updated: 19 August 2026 · Built by the CWA Europe PPC team.

Frequently asked questions

Why do GA4 and Google Ads conversion counts never quite match?

They measure differently by design — different attribution windows, different definitions of a conversion, Consent Mode modelling in Ads that GA4 doesn't do, and view-through or offline conversions that only Ads can see. A small gap is normal; this tool helps explain a LARGE or unexpected one.

Which number should I trust?

Neither is automatically 'right' — they answer different questions. Google Ads tells you what to credit your ad spend with; GA4 tells you what actually happened on your site. Use Google Ads for bidding decisions and GA4 for understanding user behaviour.

Is my data sent anywhere?

No. Everything runs in your browser; the numbers you enter are never sent to a server or stored.