Quick answer
What is CPM?
CPM means cost per thousand impressions. It shows how much you pay for 1,000 ad impressions. The CPM formula is CPM = (Ad Spend / Impressions) × 1,000. If you spend $600 for 150,000 impressions, CPM is $4.00.
Free PPC calculator
CPM Calculator
Calculate cost per thousand impressions from ad spend and impressions. Use CPM to compare the cost of reach across ad campaigns.
Result
CPM result
- CPM
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CPM formula
Use ad spend and impressions from the same campaign, platform, and reporting period. CPM is most useful when comparing the cost of reach or awareness across campaigns.
CPM = (Ad Spend / Impressions) × 1,000Ad Spend = (CPM × Impressions) / 1,000Impressions = (Ad Spend / CPM) × 1,000 - Ad Spend
- The total amount spent on the impression-based campaign or placement.
- Impressions
- The number of times the ad was shown. CPM uses impressions, not reach or clicks.
CPM calculation example
If ad spend is $1,000 and impressions are 200,000, CPM is $5.00.
- Ad spend = $1,000
- Impressions = 200,000
- CPM = ($1,000 / 200,000) × 1,000
- CPM = $5.00 per 1,000 impressions
How to use this CPM calculator
- Enter the total amount spent on the campaign.
- Enter the total number of impressions from the same report.
- Review the cost per 1,000 impressions.
- Compare CPM with CPC and CTR to understand whether cheap impressions are producing useful traffic.
How to interpret CPM
CPM is best for reach and awareness
CPM helps compare the price of impressions. It is most useful for awareness, reach, display, video, and upper-funnel campaigns.
Low CPM does not guarantee efficient traffic
Cheap impressions can still perform poorly if CTR is low or the audience is not relevant. Use CTR and CPC to evaluate whether impressions are turning into clicks.
Use reverse CPM formulas for planning
Once you know CPM, you can estimate budget or impressions. For example, ad spend equals CPM multiplied by impressions, divided by 1,000.
Use cases
CPM by platform and campaign type
YouTube CPM calculator
For YouTube campaigns, CPM can help compare the cost of video impressions across audiences, creatives, and placements.
Google Ads CPM calculator
For Google Ads display or video campaigns, use campaign cost and impressions from the same date range to calculate CPM.
CPM budget calculator
To estimate budget from CPM, multiply CPM by target impressions and divide by 1,000. This is useful when planning awareness campaigns.
Avoid mistakes
Common CPM calculation mistakes
Forgetting the 1,000 multiplier
CPM is cost per 1,000 impressions. Dividing cost by impressions gives cost per impression, not CPM.
Using reach instead of impressions
Reach counts unique people. Impressions count total ad views. CPM calculations should use impressions.
Ignoring CTR
A low CPM may look efficient, but if CTR is extremely low, the campaign may still be poor at generating traffic.
Comparing different campaign objectives
Awareness, prospecting, retargeting, video, and search campaigns can have very different CPM ranges. Compare similar campaigns when possible.
Related PPC metrics
Use CPM with related calculators
FAQ
CPM Calculator FAQ
What is CPM?
CPM means cost per thousand impressions. It shows how much you pay for 1,000 ad impressions.
How do you calculate CPM?
To calculate CPM, divide ad spend by impressions and multiply by 1,000.
What does a $5 CPM mean?
A $5 CPM means you pay $5 for every 1,000 impressions.
What is a good CPM?
A good CPM depends on the channel, audience, placement, creative quality, and campaign objective.
When should I use CPM?
CPM is useful when you compare the cost of reach, awareness, or impression-based campaigns.
What is the difference between CPM and CPC?
CPM measures cost per thousand impressions. CPC measures cost per click.
How do I calculate impressions from CPM and budget?
Use this formula: impressions = (ad spend / CPM) × 1,000. For example, $500 at a $5 CPM buys about 100,000 impressions.
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