eCPM stands for effective Cost Per Thousand Impressions (with M being the roman numeral for 1,000), or sometimes equivalent Cost Per Thousand (they are the same thing). This means that it is effectively what you would have paid if you were using a CPM model.

We have provided a useful eCPM Calculator below to work out your eCPM as well as derive the number of impressions and cost you would need to get a specific eCPM.

## eCPM Formula

The eCPM equation is basically the same as CPM:

**eCPM = (Ad Spend x 1000) / Ad impressions**

## Our eCPM Calculator:

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### ★ eCPM Definition