Google Cost per Purchase measures how much you spend on average to drive each purchase through your Google Ads campaigns.
| Metric | Definition |
|---|
| Google Spend | Total amount billed by Google for advertising |
| Google Purchases | Number of purchases attributed to Google ads |
| Metadata | |
|---|
| Type | Currency |
| Data Source | Google Ads |
| Aggregation | Ratio |
Example
A home decor store spent $4,200 on Google Ads in March and drove 84 purchases.
| Metric | Value | Calculation |
|---|
| Google Spend | $4,200 | Total ad spend |
| Google Purchases | 84 | Attributed conversions |
| Cost per Purchase | $50.00 | $4,200 ÷ 84 |
How It Works
Google Cost per Purchase divides your total Google Ads spend by the number of purchases attributed to those campaigns. Lower values indicate more efficient acquisition—you’re spending less to acquire each customer through Google.
When to Use
| Scenario | Action |
|---|
| High cost per purchase | Pause underperforming campaigns or ad groups |
| Compare campaign types | Evaluate Search vs Shopping vs Performance Max efficiency |
| Budget allocation | Shift spend to campaigns with lower acquisition costs |
| Cross-platform comparison | Compare against Meta or TikTok cost per purchase |
| Metric | Relationship |
|---|
| Google Spend | Numerator in calculation |
| Google Purchases | Denominator in calculation |
| Google ROAS | Revenue-based efficiency metric |
