Understand every ad metric, one at a time.
Bids, fill rate, ROAS, and more — definitions, formulas, and examples for publishers and growth teams.
CTR
2.4%
clicks / impressions
eCPM
$4.20
revenue / impressions × 1000
CPC
$0.42
spend / clicks
RPM
$12.8
revenue / 1000 pageviews
ROAS
3.1x
revenue / ad spend
Fill
87%
filled / requests
AdsExam
Ways to learn
Pick two metrics. See how they connect.
Where they overlap, what they trade off, and when one moves with the other — then open the full guide.