CPM, CPC & CPA calculator

Cost per 1,000 views, per click and per sale.

Quick answer

CPM = spend ÷ impressions × 1,000. CPC = spend ÷ clicks. CPA = spend ÷ conversions. 460 € for 100,000 impressions is a 5 € CPM.

Start from an example:

Show first

Main metric

Campaign results

Ad spend

Impressions

Clicks

Conversions

Sales, sign-ups or another goal.

Platforms may count impressions, clicks and conversions differently. Use the numbers from one platform's report together.

How CPM, CPC and CPA are calculated

CPM
spend ÷ impressions × 1,000
What 1,000 ad views cost. Useful for comparing reach across platforms and audiences.
CPC
spend ÷ clicks
What each click costs. CPC = CPM ÷ (CTR × 10), so a better click-through rate lowers it.
CPA
spend ÷ conversions
What each sale or sign-up costs. Compare it with profit per sale to see if ads pay off.

What is the difference between CPM, CPC and CPA?

They divide the same spend by different results: CPM by impressions (per 1,000), CPC by clicks and CPA by conversions.

Which metric should I focus on?

The one that matches your goal: CPM for awareness, CPC for traffic and CPA for sales or leads.

How do I lower my CPA?

Raise the click-through rate with better creative, raise the conversion rate with a better landing page, or target a more interested audience.

Updated November 5, 2026·By the Deviantly data team