💸 CPM Calculator
Enter any two of cost, impressions, and CPM, and leave the third blank — this calculator solves for it instantly so you can budget campaigns and compare ad buys.
🧮 Cost per 1,000 Impressions
What is a CPM Calculator?
CPM — cost per 1,000 impressions — is the currency of media buying. It lets you compare the price of reach across wildly different placements, from a display banner to a sponsored reel, on a single standard basis.
This solve-for-any calculator handles all three directions: find the CPM of a buy you already ran, forecast the spend needed to hit an impression goal, or estimate how many impressions a fixed budget should deliver. Plug in the two numbers you know and read off the third.
❓ Frequently Asked Questions
What is CPM and how is it calculated?
CPM stands for cost per mille — the cost of 1,000 ad impressions. The formula is cost ÷ impressions × 1,000. For example, spending $50 to earn 20,000 impressions gives $50 ÷ 20,000 × 1,000 = $2.50 CPM. This calculator also rearranges the formula so you can solve for cost or impressions instead.
How do I solve for cost or impressions instead of CPM?
Enter the two figures you know and leave the one you want blank. Give it CPM and impressions and it returns the cost (CPM × impressions ÷ 1,000); give it cost and CPM and it returns the impressions you should expect (cost ÷ CPM × 1,000). It always computes whichever single field you left empty.
Is a lower CPM always better?
Not necessarily. A low CPM means cheap reach, but cheap impressions can come from low-quality or poorly targeted inventory that never converts. Judge CPM alongside click-through rate, conversion rate, and ROAS — sometimes a higher CPM on a tightly targeted audience delivers far better results per dollar.
What is a typical CPM?
CPMs vary enormously by platform, country, audience, season, and objective — display can run a few dollars while premium video or narrow B2B targeting can be much higher, and rates spike in Q4. Rather than chase a benchmark, use this calculator to compare your own campaigns and inventory sources on a like-for-like basis.