CPM Calculator

CPM stands for cost per mille, the cost of 1,000 ad impressions. To calculate it, divide what you spent by the number of impressions you received, then multiply by 1,000. The multiplication is only there to turn a fraction of a cent per impression into a number you can read and compare.

Because almost every platform reports CPM, it is the quickest way to compare how expensive attention is across campaigns, placements, audiences, and channels. The same formula also runs backwards: multiply CPM by impressions and divide by 1,000 to get spend, or divide spend by CPM and multiply by 1,000 to get impressions.

CPM measures the price of attention, not its value. Pair it with your click-through rate and conversion rate to see what each thousand impressions actually produces, which is what the converter in the calculator above does.

There is no single good CPM. The number depends on the platform, the country, the placement, how narrow and contested the audience is, the campaign objective, and the time of year, so a CPM that is cheap for one advertiser can be expensive for another.

The more useful question is whether the impressions are worth it. A $20 CPM at a 2% click-through rate costs $1.00 per click, while a $12 CPM at a 1% click-through rate costs $1.20 per click. The expensive impressions were the better deal. Run your own numbers through the converter above before deciding a CPM is too high.

What does matter is direction. A CPM that keeps climbing on the same audience and placements is usually a sign of creative fatigue or rising frequency, and the fix is new creative rather than a lower bid.