When GA4 numbers don’t match Google Ads, it can be confusing for advertisers. Fundamentally, both platforms use different attribution models and counting methods. This means that discrepancies between GA4 and Google Ads are perfectly normal. In this post about mismatching GA4 numbers, we explain the reasons and how to interpret the data correctly. We also show concrete approaches for better data consistency.

Why Don’t GA4 Numbers Match Google Ads?

The main reason lies in different attribution models. Google Ads uses data-driven attribution by default and counts conversions on the click date. GA4, however, assigns conversions to the actual conversion date. Additionally, Google Ads counts each conversion individually, while GA4 can aggregate events per session. Therefore, check the session definition in GA4 to better understand the numbers. Different time windows inevitably lead to different numbers.

Key Differences in Conversions and Sessions

Beyond attribution models, there are further differences. Google Ads counts view-through conversions that GA4 does not capture. Furthermore, consent status can cause GA4 to count fewer conversions since blocked tags send no data. However, Google Ads often models missing conversions. The Google documentation on data discrepancies lists all known differences.

Our Recommendation

Do not compare the numbers one-to-one. Instead, use Google Ads for campaign optimization and GA4 for overall user behavior analysis. Make sure the GA4 property is correctly linked to your Google Ads account and import GA4 conversions into Google Ads. Choose identical conversion windows and counting methods wherever possible. Both platforms provide valuable but different perspectives on your data.

Conclusion

Discrepancies between GA4 and Google Ads are system-related and not errors. What matters is understanding the differences and using the right platform for each purpose. Our Google Ads agency can help you align both systems optimally. Also read our post about missing GA4 conversions.