CPM calculator
CPM is the cost per thousand impressions. Enter any two values and this calculator solves the third — use the CPM figures from your own ad account or platform planner for real answers.
Enter any two values to solve the third.
Impressions = Budget ÷ CPM × 1,000
example inputs — replace with your own numbers
How to use this calculator
Where to find your real CPM: your ad platform reports it per campaign; use recent numbers from your own account or the platform's planning tools rather than any generic benchmark — CPMs vary widely by audience, placement, season, and creative quality, which is exactly why planning on your own numbers beats planning on someone's average.
Start from whichever two numbers you actually know. If a budget is already approved, enter it with a CPM pulled from a comparable recent campaign and read the impressions you can expect. If instead you have a reach target, enter the impressions and your CPM to get the budget that target implies — that figure is far easier to defend internally than a round number chosen in a meeting.
Treat the output as a planning range, not a promise. Impressions are bought in an auction, so the CPM you paid last quarter is an input worth testing, not a rate card. Narrow audiences, premium placements, and high-demand periods push CPM up; broader targeting and strong creative tend to pull it down. Run the calculation at a low CPM and a high one to see the band your plan lives in.
Finally, remember CPM measures delivery, not results. Use it to size reach, then use the breakeven calculator to check whether the traffic that reach produces can pay for itself at your own conversion rates and customer value.