> ## 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 Cost per Add to Cart: Measure Purchase Intent Efficiency

> Track your TikTok cost per add to cart to measure how efficiently your ads drive purchase intent. Lower costs mean better mid-funnel performance.

<Tip>
  Average spend per add-to-cart event from your TikTok ads—a key indicator of how efficiently your campaigns drive purchase intent.
</Tip>

## Formula

<Info>
  **TikTok Cost per Add to Cart** = **TikTok Ad Spend** ÷ **TikTok Add to Carts**
</Info>

### Formula Components

| Metric                                                                                                  | Definition                                                  |
| ------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------- |
| [**TikTok Ad Spend**](/reference/metrics/advertising/tiktok/tiktok-spend/tiktok-spend)                  | Total amount spent on your TikTok ads                       |
| [**TikTok Add to Carts**](/reference/metrics/advertising/tiktok/tiktok-conversions/tiktok-add-to-carts) | Number of add to cart actions attributed to your TikTok ads |

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

***

## Example

Your TikTok prospecting campaign spent **\$2,400** last week and drove **800 add to carts**.

| Campaign               | Spend       | Add to Carts | Cost/ATC   |
| ---------------------- | ----------- | ------------ | ---------- |
| Prospecting - Video    | \$1,500     | 600          | \$2.50     |
| Retargeting - Carousel | \$900       | 200          | \$4.50     |
| **Total**              | **\$2,400** | **800**      | **\$3.00** |

***

## How It Works

TikTok tracks add-to-cart events through its Pixel or Events API. Upstack calculates cost per add to cart by dividing your total TikTok ad spend by the number of attributed add-to-cart events during the selected period.

***

## When to Use

| Scenario                         | Action                                                       |
| -------------------------------- | ------------------------------------------------------------ |
| Evaluating mid-funnel efficiency | Compare cost/ATC across campaigns to find best performers    |
| Creative testing                 | Lower cost/ATC signals more compelling product presentation  |
| Audience optimization            | Identify which audiences show strongest purchase intent      |
| Budget allocation                | Shift spend toward campaigns with lower cost per add to cart |

***

## Related Metrics

| Metric                                                                                                                       | Relationship                                          |
| ---------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------- |
| [TikTok Add to Carts](/reference/metrics/advertising/tiktok/tiktok-conversions/tiktok-add-to-carts)                          | The denominator—total add to cart events              |
| [TikTok CPA](/reference/metrics/advertising/tiktok/tiktok-efficiency/tiktok-cpa)                                             | Cost per purchase—measures full conversion efficiency |
| [TikTok Cost per Initiate Checkout](/reference/metrics/advertising/tiktok/tiktok-conversions/tiktok-initiate-checkouts-cost) | Next funnel stage—cost per checkout started           |

[See all TikTok Conversions metrics →](/reference/metrics/advertising/tiktok/tiktok-conversions)