Cost per 1,000 ad impressions. The CPM Calculator takes ad spend, impressions and returns cpm (cost per 1,000 impressions) plus cost per impression. Results update as you type, and the formula is shown under the result so you can repeat it in your own spreadsheet.
Marketing metrics are most useful as trends and comparisons between channels. Measure every campaign the same way, over the same period, and judge it against your gross margin rather than against revenue alone. Use the worked example below to check the maths against your own figures.
How the CPM Calculator works
Display and social ads are priced per thousand impressions. CPM alone says nothing about results; pair it with CTR and conversion rate.
Worked example
With the example values (ad spend of $2,000, impressions of 400000), the cpm (cost per 1,000 impressions) is $5.00; cost per impression $0.01. Change any figure above and the result updates immediately; use Copy results to paste the summary into a note or email.
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Frequently Asked Questions
How is cpm (cost per 1,000 impressions) calculated?
CPM = spend ÷ impressions × 1,000.
Which figures do I need?
Ad spend, impressions. Take them from the same period and the same set of accounts or reports so the ratio is consistent, and check the example values as a guide to the units expected.
How often should I track this metric?
Weekly for live campaigns, monthly for channel comparisons, and always over the same period for spend and results so the figures line up.
