About the Impression Calculator
How many ad impressions a budget buys at a given CPM, and expected clicks at your CTR.
Also known as: impressions from budget, ad impressions, reach from cpm.
How to use this calculator
- Enter budget, cpm, ctr.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Impressions = budget ÷ CPM × 1000
Worked example
Using the values pre-filled in the calculator above:
- Budget = 1,000
- CPM = 8
- CTR = 1.2 %
the calculator returns:
- Impressions: 125,000
- Expected clicks: 1,500
- Effective CPC: 0.67