> ## Documentation Index
> Fetch the complete documentation index at: https://docs.upstackdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Blended Efficiency: Aggregated ROAS and CPA

> Track advertising efficiency metrics across all platforms. Includes Blended ROAS, Blended CPA, and new customer acquisition metrics.

Efficiency metrics measure how effectively your advertising investment converts to revenue or customer acquisition across all connected platforms.

<Info>
  **Data Source:** Meta Ads, Google Ads, TikTok Ads (aggregated)\
  **Metrics:** 7
</Info>

## Metrics in This Group

| Metric                                                                                                           | Description                              | When to Use              |
| ---------------------------------------------------------------------------------------------------------------- | ---------------------------------------- | ------------------------ |
| [Blended CPA](/reference/metrics/advertising/blended/blended-efficiency/blended-cpa)                             | Cost per acquisition across all channels | Measure acquisition cost |
| [Blended ROAS](/reference/metrics/advertising/blended/blended-efficiency/blended-roas)                           | Return on ad spend across all channels   | Measure revenue return   |
| [Blended NC CPA](/reference/metrics/advertising/blended/blended-efficiency/blended-new-customer-cpa)             | Cost per new customer acquisition        | New customer cost        |
| [Blended NC ROAS](/reference/metrics/advertising/blended/blended-efficiency/blended-new-customer-roas)           | Return on ad spend for new customers     | New customer efficiency  |
| [Blended Conversions ROAS](/reference/metrics/advertising/blended/blended-efficiency/blended-conversions-roas)   | ROAS for all conversion events           | Conversion efficiency    |
| [Blended All Conv. ROAS](/reference/metrics/advertising/blended/blended-efficiency/blended-all-conversions-roas) | ROAS including cross-device              | Full attribution ROAS    |

## How These Metrics Relate

Efficiency metrics are ratios that connect spend to outcomes:

* **CPA** = Total Spend ÷ Purchases (cost to acquire a customer)
* **ROAS** = Purchase Value ÷ Total Spend (revenue per dollar spent)
* **NC CPA** = Spend ÷ New Customer Purchases (cost for new customers)
* **NC ROAS** = NC Purchase Value ÷ Spend (new customer revenue return)

ROAS and CPA are inversely related—high ROAS typically means low CPA.

## Choosing the Right Metric

* **E-commerce profitability**: Focus on ROAS (target typically 3x–5x)
* **Customer acquisition**: Track CPA and NC CPA
* **New customer growth**: Monitor NC ROAS to ensure acquisition is profitable
* **Full funnel view**: Use All Conversions ROAS for complete attribution

## Benchmarks

| Metric | Good       | Excellent  |
| ------ | ---------- | ---------- |
| ROAS   | 3x         | 5x+        |
| CPA    | \< 1/3 AOV | \< 1/5 AOV |
| NC CPA | \< LTV/3   | \< LTV/5   |