POSTNCHILL · Free tool
CPM calculator
Work out cost per thousand impressions, or turn a CPM into an estimated spend or reach. Runs in your browser; nothing is sent anywhere.
Calculate
Use one currency and the same date range and impression definition for both numbers. The example values are illustrative, not a benchmark.
The formula
CPM = ad spend ÷ impressions × 1,000. If a campaign spends 240 and records 30,000 impressions, its CPM is 240 ÷ 30,000 × 1,000 = 8.
What CPM does not tell you
CPM measures the price of delivery, not who was reached or whether the campaign worked. One person can see several impressions, and a low CPM can still mean irrelevant reach. Pair it with reach, click-through rate or conversions. Our guide explains the full CPM workflow.
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