> ## 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.

# TikTok Efficiency: ROAS and CPA Metrics

> Track TikTok advertising efficiency with ROAS and CPA metrics. Measure return on ad spend and cost per acquisition for TikTok campaigns.

Efficiency metrics measure the effectiveness of your TikTok ad spend—how much revenue you generate per dollar spent and how much each conversion costs.

<Info>
  **Data Source:** [TikTok Ads](/sources/tiktok)\
  **Metrics:** 2
</Info>

## Metrics in This Group

| Metric                                                                             | Description                                        | When to Use                    |
| ---------------------------------------------------------------------------------- | -------------------------------------------------- | ------------------------------ |
| [TikTok ROAS](/reference/metrics/advertising/tiktok/tiktok-efficiency/tiktok-roas) | Revenue per dollar spent (Purchases Value ÷ Spend) | Measure campaign profitability |
| [TikTok CPA](/reference/metrics/advertising/tiktok/tiktok-efficiency/tiktok-cpa)   | Cost per purchase (Spend ÷ Purchases)              | Evaluate acquisition cost      |

## How These Metrics Relate

ROAS and CPA are inverse efficiency measures:

* **TikTok ROAS** tells you how much revenue you earn per dollar spent (higher is better)
* **TikTok CPA** tells you how much you spend per conversion (lower is better)

Both depend on:

* [TikTok Ad Spend](/reference/metrics/advertising/tiktok/tiktok-spend/tiktok-spend) — your investment
* [TikTok Purchases](/reference/metrics/advertising/tiktok/tiktok-conversions/tiktok-purchases) — conversions attributed
* [TikTok Purchases Value](/reference/metrics/advertising/tiktok/tiktok-conversions/tiktok-purchases-value) — revenue attributed

## Choosing the Right Metric

* **Revenue-focused analysis**: Use ROAS to measure dollar-for-dollar return
* **Cost control**: Use CPA to track acquisition costs against targets
* **Campaign optimization**: Compare both across ad sets to find efficient performers