There are the most important calculations for your metrics (KPIs).
Metrics vs. KPIs
Metrics and KPIs are like squares and rectangles: All squares are rectangles, but not all rectangles are squares. Similarly, all KPIs are metrics, but not all metrics are KPIs.
Source: https://www.grow.com/blog/metrics-and-kpis-are-different
How to calculate the following metrics
If you want to read the whole explanation, go to https://headerbidding.co/calculate-cpm-cpc-cpa-ecpm-ecpc-ecpa-roi. If you just need the formula for each, continue below:
CPM – Cost Per Mille/Cost Per Thousand
CPM = (Cost to the Advertiser / No. of Impressions) x 1000
CPC – Cost Per Click
CPC= Cost to the Advertiser / Number of Clicks
CR – Conversion Rate
CR= (Number of positive conversions/ Number of clicks received) x 100
CPA – Cost Per Action/Acquisition
CPA = Cost to the Advertiser / Number of Conversions
CPA = Cost to an advertiser / (Number of ad impressions x CTR x CR)
eCPM- Effective Cost per Mille
eCPM = (Total earning from an ad campaign/ Total impressions) x 1000
eCPC – Effective Cost Per Click
eCPC = Total Earning from an ad campaign/ Total number of clicks received
eCPA – Effective Cost Per Action
eCPA = Total earning from an ad campaign/ Total number of actions taken
ROI – Return on Investment
ROI = (Total ad Revenue – Total ad campaign cost) / Total ad campaign cost