Ad-buying calculators

Six calculators for the numbers an ad buy comes down to — CPM, CPC, CTR, CPA, eCPM and what a campaign costs — each one opens with the median rate actually published on this directory, not a textbook example.

Fill in any two fields on a calculator and the third fills itself in. Nothing here is saved or sent anywhere.

Cost per thousand impressions — fill in spend, impressions or CPM, get the third.

Cost per click — fill in spend, clicks or CPC, get the third.

Click-through rate — fill in impressions, clicks or CTR, get the third.

Cost per acquisition — fill in spend, conversions or CPA, get the third.

Effective CPM — a publisher's revenue per thousand impressions.

What a campaign costs — budget, CPM and expected CTR into impressions, clicks and cost per click.