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CPM Calculator

CPM is the cost of 1,000 ad impressions — the “M” is the Roman numeral for a thousand. Enter cost and impressions to get CPM, or solve the other way: what a campaign will cost at a given CPM, or how many impressions a budget will buy.

Quick examples
$
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CPM$2.50

Cost per 1,000 impressions

Total cost
$500.00
Impressions
200,000
Cost per single impression
$0.0025

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      Formula

      CPM = total cost ÷ impressions × 1,000
      Total cost = CPM × impressions ÷ 1,000
      Impressions = total cost ÷ CPM × 1,000

      How to use it

      1. Choose what you want to solve for.
      2. Enter the two numbers you know.
      3. Read the result, plus the cost of a single impression.

      Worked examples

      A $500 campaign that delivered 200,000 impressions

      CPM
      $2.50
      Cost per single impression
      $0.0025

      Buying 1,500,000 impressions at an $8 CPM

      Total cost
      $12,000.00

      What a $1,000 budget buys at a $5 CPM

      Impressions
      200,000

      How CPM relates to CPC and CTR

      The three are tied together: CPM = CPC × CTR × 1,000, with CTR as a decimal. An ad with a $0.50 cost per click and a 2% click-through rate has an effective CPM of $10.

      That makes CPM a useful common yardstick. You can compare a campaign billed per click with one billed per impression by converting both to effective CPM (eCPM).

      What drives CPM

      CPM is set by auction on most platforms, so it rises with competition: narrow or high-income audiences, premium placements, video formats, and the weeks before major holidays all push it up. Broad audiences and display banners sit at the cheap end.

      Questions people ask

      What does CPM stand for?

      Cost per mille — cost per thousand impressions. A $5 CPM means you pay $5 each time your ad is shown 1,000 times.

      How much do 50,000 impressions cost at a $10 CPM?

      $500. Divide the impressions by 1,000 and multiply by the CPM: 50 × $10.

      How do I calculate CPM?

      Divide the cost by the impressions and multiply by 1,000. $500 for 200,000 impressions is a $2.50 CPM.

      Related calculators

      CPC CalculatorCost per click, plus CTR, CPM and cost per conversion.CTR CalculatorClick-through rate from clicks and impressions.ROAS CalculatorReturn on ad spend, break-even ROAS and profit after ad costs.Conversion Rate CalculatorShare of visitors who convert, with revenue per visitor.CAC CalculatorCost to acquire one customer, and how long it takes to earn back.