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CPM, CPC & CPA Calculator

Calculate advertising cost metrics — CPM, CPC, CPA and CTR — from spend, impressions, clicks and conversions. Leave one blank to solve for it.

How to use

  1. 1Enter your ad spend.
  2. 2Enter impressions, clicks and conversions from your ad dashboard.

How it's calculated

CPM = spend ÷ impressions × 1,000. CPC = spend ÷ clicks. CPA = spend ÷ conversions. CTR = clicks ÷ impressions. Conversion rate = conversions ÷ clicks.

Frequently asked questions

What's a good CTR?

It varies by platform and industry — search ads often get 3–6%, display ads well under 1%.

CPM, CPC or CPA — which should I optimize?

Optimize for what matters to the business, usually CPA (or ROAS). A cheap CPM means little if those impressions don't convert.

What does the M in CPM mean?

Mille — Latin for thousand. CPM is the cost per thousand impressions.