CPM Calculator - Cost Per Thousand Impressions

The CPM calculator reports cost per thousand impressions, the standard unit price for display, video, social, and many programmatic ads. CPM equals campaign cost divided by impressions, then multiplied by 1,000. A $1,000 campaign that delivers 100,000 impressions has a CPM of $10. Buyers use that number to compare publishers and auctions without being misled by raw spend or raw reach. Sellers use it to quote inventory. Because the unit is always one thousand impressions, a cheap-looking total on a small placement can still be expensive on a CPM basis, and a large brand buy can still be efficient. Media planners look at CPM next to viewability, audience quality, and frequency. A lower CPM is not automatically better if the impressions are unviewable, off-target, or stacked on the same users. A higher CPM on a premium news site or logged-in social inventory can still be the better buy if it reaches the intended account list. The calculator isolates the price term so you can hold quality constant and see how spend and delivery move the rate. It does not include agency fees, creative production, or brand-safety exclusions unless you add those costs to campaign cost. Use cases include pacing a flight, reconciling a platform invoice, and converting a proposed budget into expected impressions at a known CPM. If you know cost and target CPM, implied impressions equal cost / CPM × 1,000. If you know impressions and target CPM, implied cost equals impressions / 1,000 × CPM. Recalculate whenever delivery or spend changes mid-campaign, especially after bid, geo, or frequency-cap edits. Caveats: impression counting differs across platforms, and some vendors report served impressions while others report viewable impressions. Compare like with like. CPM also ignores clicks and conversions; pair it with CTR, CPC, and CPA when the goal is response rather than reach. Used consistently, the CPM calculator makes inventory quotes and campaign invoices easier to compare.