This calculator works out CPM, the cost per thousand impressions, from what a campaign cost and how many impressions it delivered. You also get the cost of a single impression and the impressions bought per unit of money.
Formula
CPM = cost ÷ impressions × 1000. Cost per impression = cost ÷ impressions. To plan a budget the other way round, cost = CPM × impressions ÷ 1000.
- cost: amount spent, in any currency
- imp: impressions served
Worked Example
250 spent for 100,000 impressions.
- 250 ÷ 100,000 = 0.0025 per impression
- CPM = 0.0025 × 1000 = 2.50
- 100,000 ÷ 250 = 400.0 impressions per unit
Limits and common mistakes
- CPM measures exposure, not results; compare cost per click or per sale for outcomes.
- “Mille” is Latin for thousand, so CPM is always per 1,000.
- Use the impressions actually served, not the number booked.
Formula used
in cost | Total cost | - | 250 | 0 in imp | Impressions | - | 100000 | 0 out cpm | CPM (cost per 1,000 impressions) | - | cost / imp * 1000 | 2 out cpi | Cost per impression | - | cost / imp | 4 out per | Impressions per unit of money | - | imp / cost | 1
Each line is one input (in, sel, list) or one result (out: label, unit, formula, decimals). How the calculators work
Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.
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