> ## 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.

# Cart to Purchase Rate: Measure Checkout Completion

> Track the percentage of shoppers who complete a purchase after adding items to cart. Identify checkout friction and optimize your conversion funnel.

<Tip>
  Cart to Purchase Rate measures the percentage of shoppers who complete a purchase after adding items to their cart.
</Tip>

## Formula

<Info>
  **Cart to Purchase Rate** = ( **Purchases** ÷ **Add to Carts** ) × 100
</Info>

### Formula Components

| Metric           | Definition                                               |
| ---------------- | -------------------------------------------------------- |
| **Purchases**    | Total number of completed purchases tracked by the pixel |
| **Add to Carts** | Total number of add-to-cart events tracked by the pixel  |

| Metadata        |                         |
| --------------- | ----------------------- |
| **Type**        | Percentage              |
| **Data Source** | [Upstack Pixel](/pixel) |
| **Aggregation** | Ratio                   |

***

## Example

Your Shopify store tracked **2,847 add-to-cart events** and **712 purchases** last month.

| Metric                    | Value     |
| ------------------------- | --------- |
| Add to Carts              | 2,847     |
| Purchases                 | 712       |
| **Cart to Purchase Rate** | **25.0%** |

A 25% cart to purchase rate means 1 in 4 shoppers who add items to cart complete a purchase.

***

## How It Works

Cart to Purchase Rate is calculated by dividing the total number of completed purchases by the total number of add-to-cart events, then multiplying by 100. This metric tracks events captured by the Upstack Pixel and reflects the efficiency of your checkout funnel.

***

## When to Use

| Scenario              | Action                                                 |
| --------------------- | ------------------------------------------------------ |
| Checkout optimization | Identify friction points causing cart abandonment      |
| A/B testing           | Compare checkout flow variants by conversion rate      |
| Seasonal analysis     | Track how purchase intent varies by period             |
| Campaign evaluation   | Measure if traffic quality affects checkout completion |

***

## Related Metrics

| Metric              | Relationship                                   |
| ------------------- | ---------------------------------------------- |
| **Add to Carts**    | Numerator component — total cart additions     |
| **Purchases**       | Denominator component — completed transactions |
| **Conversion Rate** | Similar funnel metric — sessions to purchases  |

[See all Conversions metrics →](/reference/metrics/funnel/conversions)