ROAS, CPA, CLV: The Key Metrics Your Google Ads Agency Should Report

If your agency sends you reports you don't really understand or can't derive any actions from, that's no coincidence. Many agencies write reports for impression, not for decision-making. We show you what ROAS, CPA and CLV really mean - and what sets strategically useful reporting apart.

If your Google Ads agency sends you reports every month that you don't really understand, or that you can't derive any actions from, that's no coincidence. Many agencies write reports for impression, not for decision-making.

ROAS: the number everyone knows and hardly anyone truly understands

Return on ad spend is the best-known metric in performance marketing. The challenge starts with the question of which ROAS you are measuring. There isn't just one ROAS - there are at least four, and they get mixed up all the time.

Platform ROAS is the one Google Ads shows you in the account. Gross ROAS is based on gross revenue including VAT. Net ROAS is based on net revenue excluding VAT. Contribution margin ROAS is the most strategically relevant - it is based on the contribution margin after variable costs, returns and payment fees.

The trap of setting your ROAS target too high

Many shops set ROAS targets that look sensible at first glance but structurally block growth. A target like "ROAS must be at least 6" sounds fair, but it means your traffic comes exclusively from warm, high-converting sources. New customer acquisition suffers.

CPA: the number that exposes the bottleneck

Cost per acquisition describes what a new purchase costs you. If your average order value is 80 € and your CPA is 25 €, then acquisition alone consumes 31 percent of your revenue.

The crucial extension is the "blended CPA". This includes not just Google Ads costs, but all acquisition-relevant marketing costs.

Splitting CPA by new vs. existing customers

Particularly valuable is splitting CPA into new-customer CPA and existing-customer CPA. An agency that only shows you an average CPA is letting you overlook one of your most important strategic levers.

CLV: the number that changes everything

Customer lifetime value describes how much revenue a customer generates over the entire duration of their relationship with your shop. If your average CLV is 200 €, you can spend significantly more on acquisition than with a CLV of 50 €.

Other metrics that belong in good reporting

The share of new customers relative to total traffic shows how healthy your acquisition is. Impression share shows where you are leaving money on the table. The return rate per campaign is an important indicator in many industries.

What separates good reporting from bad reporting

Good reporting doesn't just show you the numbers - it shows you the story behind the numbers. It tells you why ROAS rose or fell last month, and which concrete actions led to which results.

Reports without context are worthless.

Conclusion: metrics are strategic tools, not decoration

ROAS, CPA and CLV are not numbers you glance at once a month and then forget. They are the strategic tools your agency uses to make decisions.