Enter the total ad spend and the total number of impressions to determine the effective cost per 1000 impressions (eCPM).

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## eCPM Formula

The following formula is used to calculate an effective cost per 1000 impressions.

eCPM = TAS / TMI * 1000

- Where eCPM is the effective cost per 1000 ad impressions ($/1000 impressions)
- TAS is the total ad spend ($)
- TMI is the total measured impressions

To calculate the eCPM, divide the total ad spend by the total measured impressions, then multiply by 1000.

## eCPM Definition

**What is eCPM? **

eCPM, short for effective cost per mile, is a term used in digital marketing to describe the effective cost of an advertising campaign per 1000 measured impressions.

**What is the difference between eCPM and CPM?**

The key difference between eCPM and CPM is that eCPM is the total cost per 1000 ad impressions after a campaign has been run and CPM is the cost for every 1000th impression when starting the campaign.

## Example Problem

**How to calculate eCPM? **

First, determine the total ad spend on the campaign. For this example, the total amount spent on ads was $10,000.00.

Next, determine the exact number of impressions measured during the campaign. For this example, the measured impressions were 150,000.

Finally, calculate the eCPM using the formula above:

eCPM = TAS / TMI * 1000

eCPM = 10,000/150,000 * 1000

eCPM = $66.667 per 1000 impressions