How to Calculate an Advertising Average CPM Rate

A vintage HP-35 calculator
A vintage HP-35 calculator. Photo: Seth Morabito, CC BY 2.0, via Wikimedia Commons.

Publishers want to know what their traffic is worth. Advertisers want to know what a campaign will cost. Both questions come down to the CPM: the price of 1,000 impressions.

CPM = (cost of the campaign ÷ impressions) × 1,000

Four steps to set your advertising rate

  1. Set a service rate. Decide what your time is worth per hour. Include office space, staff and tools, and leave a surplus.
  2. Estimate the time a campaign needs. Some sellers charge per hour, others per campaign. A per-campaign fee should match your hourly rate.
  3. Price your placements. Each placement has a different value: a header banner is not a footer link. Price them separately.
  4. Combine the two. The total rate covers your service and the placement itself.

Five questions that predict a site's CPM

  • Is the site "sticky", or a one-hit wonder that visitors use once, like a reference site?
  • Is it general, or focused on a valuable category like cars, finance or betting?
  • Who visits: everyone worldwide, or mainly the US and Western Europe?
  • Does it depend on Google search, or does a community bring people back?
  • How many pageviews does it have?
Running the numbers is the first step to pricing ad space
Running the numbers is the first step to pricing ad space. Photo: Seth Morabito, CC BY 2.0, via Wikimedia Commons.

Easy and hard sites to monetize

The easiest site to monetize is a one-hit wonder in a commercial category, with US or UK visitors and lots of search traffic. Visitors arrive in a "transactional" mood, so click-through rates are high. A sports betting odds comparison page or a casino bonus guide is a classic example: people come from search, ready to choose an operator, and leave through an ad or affiliate link.

The hardest is a sticky, general site such as a chat community, with traffic from countries where advertisers spend little. People are not in a buying mood, and even if they were, there would be little demand to monetize them.

Next step: convert CPC and CPA revenue into a CPM you can compare with the eCPM formula.

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