> ## 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 CPA: Cost Per Acquisition

> Track TikTok CPA to measure how much you spend for each TikTok-attributed purchase. Lower CPA means more efficient ad spend.

<Tip>
  TikTok CPA measures how much you spend on average for each purchase TikTok attributes to your ads—lower is better.
</Tip>

## Formula

<Info>
  **TikTok CPA** = **TikTok Spend** ÷ **TikTok Purchases**
</Info>

### Formula Components

| Metric                                                                                            | Definition                                        |
| ------------------------------------------------------------------------------------------------- | ------------------------------------------------- |
| [**TikTok Spend**](/reference/metrics/advertising/tiktok/tiktok-spend/tiktok-spend)               | Total amount spent on TikTok ads                  |
| [**TikTok Purchases**](/reference/metrics/advertising/tiktok/tiktok-conversions/tiktok-purchases) | Number of purchases TikTok attributes to your ads |

| Metadata        |                               |
| --------------- | ----------------------------- |
| **Type**        | Currency                      |
| **Data Source** | [TikTok Ads](/sources/tiktok) |
| **Aggregation** | Ratio                         |

***

## Example

Your TikTok campaigns spent **\$12,000** and TikTok reported **400 attributed purchases**.

| Metric           | Value       | Calculation            |
| ---------------- | ----------- | ---------------------- |
| TikTok Spend     | \$12,000    | Total ad spend         |
| TikTok Purchases | 400         | Attributed conversions |
| **TikTok CPA**   | **\$30.00** | \$12,000 ÷ 400         |

***

## How It Works

TikTok CPA divides your total TikTok ad spend by the number of purchases TikTok attributes to those ads. This attribution uses TikTok's click and view windows to connect ad interactions with conversions. A lower CPA indicates more efficient customer acquisition from your TikTok advertising.

***

## When to Use

| Scenario                       | Action                                                          |
| ------------------------------ | --------------------------------------------------------------- |
| Campaign efficiency comparison | Compare CPA across campaigns to identify top performers         |
| Budget allocation decisions    | Shift budget toward campaigns with lower CPA                    |
| Scaling evaluation             | Monitor CPA as you increase spend to catch efficiency drops     |
| Creative testing               | Use CPA to measure which ad creatives drive cheaper conversions |

***

## Related Metrics

| Metric                                                                                                    | Relationship                                      |
| --------------------------------------------------------------------------------------------------------- | ------------------------------------------------- |
| [TikTok ROAS](/reference/metrics/advertising/tiktok/tiktok-efficiency/tiktok-roas)                        | Revenue efficiency counterpart to cost efficiency |
| [TikTok Spend](/reference/metrics/advertising/tiktok/tiktok-spend/tiktok-spend)                           | Numerator in CPA calculation                      |
| [TikTok Purchases](/reference/metrics/advertising/tiktok/tiktok-conversions/tiktok-purchases)             | Denominator in CPA calculation                    |
| [TikTok Purchases Value](/reference/metrics/advertising/tiktok/tiktok-conversions/tiktok-purchases-value) | Revenue generated from TikTok purchases           |

[See all TikTok Efficiency metrics →](/reference/metrics/advertising/tiktok/tiktok-efficiency)