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 benchmarksReturn 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
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
Pull metrics from Google Ads directly through the Model Context Protocol.
Connect your existing warehouse where Google Ads data already lands.
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 AdvertisingMetric 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.
Conversion Rate
Paid AdvertisingMetric 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.
Customer Lifetime Value (Ads)
Paid AdvertisingMetric 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.
Budget Allocation Analysis
Paid AdvertisingMetric 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.
Cost per Click
Paid AdvertisingMetric 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.
Explore return on ad spend across integrations
All Google Ads metrics
Empower your team to understand and act on Google Ads data
Map what drives your metrics, measure progress at any grain, prove what works statistically, and deliver personalised action plans to every team member.