KPI Tree

Google Ads Metric

Paid Advertising

ROAS = Revenue Attributed to Ads / Total Ad Spend

Return on ad spend measures the revenue generated for every pound spent on Google Ads. It provides a direct ratio of revenue to cost that quantifies the financial return of your paid search investment, making it the primary efficiency metric for revenue-focused campaigns.

Full guide: definition, formula, and benchmarks
Google AdsPaid Advertising

Return on Ad Spend

Return on ad spend measures the revenue generated for every pound spent on Google Ads. It provides a direct ratio of revenue to cost that quantifies the financial return of your paid search investment, making it the primary efficiency metric for revenue-focused campaigns.

How to calculate return on ad spend

ROAS = Revenue Attributed to Ads / Total Ad Spend

Why return on ad spend matters for Google Ads users

ROAS is the bottom-line metric for paid search. It answers the fundamental question: for every pound you spend on Google Ads, how much revenue do you get back? A ROAS below 1.0 means you are losing money on every ad pound spent. A ROAS of 4.0 means every pound generates four pounds of revenue.

Mapping ROAS in your metric tree connects it to the upstream metrics that drive it - CPC, CTR, conversion rate, and average order value. When ROAS declines, the tree reveals which component is responsible, enabling targeted intervention rather than broad budget cuts.

Understand and act on return on ad spend with KPI Tree

KPI Tree syncs ROAS data from your warehouse, combining ad spend with revenue attribution. Track ROAS per campaign, ad group, keyword theme, and audience segment.

Assign RACI ownership to your paid media director. Set alerts when ROAS drops below target thresholds and track optimisation actions aimed at restoring return through cost reduction or conversion improvement.

Get started with your Google Ads data

Query using MCP
MCP

Pull metrics from Google Ads directly through the Model Context Protocol.

Data Warehouse
SnowflakeBigQueryDatabricksRedshift

Connect your existing warehouse where Google Ads data already lands.

Professional Services
FivetranSnowflakedbt

Our professional services team can build you turn-key AI foundations in a matter of weeks. Data warehouse on Snowflake/BigQuery, ELT with Fivetran, all modelled in dbt with a semantic layer.

Related Google Ads metrics

Cost per Acquisition

Paid Advertising

Metric Definition

Cost per Acquisition = Total Ad Spend / Total Conversions

Cost per acquisition measures the average amount spent on Google Ads to acquire one conversion. It combines click costs and conversion rates into a single efficiency metric that represents the true cost of each customer action generated through paid search.

View metric

Conversion Rate

Paid Advertising

Metric Definition

Conversion Rate = (Conversions / Clicks) x 100

Conversion rate measures the percentage of Google Ads clicks that result in a defined conversion action - such as a purchase, signup, form submission, or phone call. It quantifies how effectively your ads and landing pages turn paid traffic into measurable business outcomes.

View metric

Customer Lifetime Value (Ads)

Paid Advertising

Metric Definition

LTV (Ads) = Average Revenue per Customer x Average Customer Lifespan

Customer lifetime value from ads measures the total revenue generated over the full customer relationship for customers acquired through Google Ads. It connects upfront acquisition costs to long-term value, providing a complete picture of paid search ROI beyond initial conversion.

View metric

Budget Allocation Analysis

Paid Advertising

Metric Definition

Budget allocation analysis evaluates how Google Ads spend is distributed across campaigns, ad groups, and audience segments, and how that distribution relates to conversion volume and return on ad spend. It identifies over-invested and under-invested areas to optimise overall portfolio performance.

View metric

Cost per Click

Paid Advertising

Metric Definition

Cost per Click = Total Ad Spend / Total Clicks

Cost per click measures the average amount paid for each click on a Google Ads advertisement. It reflects the competitive intensity of the keywords and audiences you target, the quality of your ads, and the effectiveness of your bidding strategy.

View metric

Explore return on ad spend across integrations

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