When AdSense RPM Looks High—Recalculate the Denominator

When RPM looks unusually high, first record which RPM, the period, estimated earnings, and the denominator. Do not begin with an explanation about success, ad price, or future income.

The official formula

Google defines RPM by dividing estimated earnings by the number of page views, impressions, or queries and multiplying by 1,000. Google, “Revenue per thousand impressions”

RPM = estimated earnings / matching page views or impressions * 1,000

“Revenue for 1,000 displayed ads” is therefore incomplete when the selected column is Page RPM rather than Impression RPM.

A small-denominator example

With estimated earnings of ¥10 and 10 page views:

10 / 10 * 1,000 = ¥1,000 page RPM

The actual estimate is still ¥10. With 11 page views and unchanged earnings, RPM becomes about ¥909. A single event has a large effect when the denominator is small.

Five fields to record

1. Metric name: Page RPM, Impression RPM, or another column.
2. Period: today, seven days, or a fixed month.
3. Numerator: estimated earnings.
4. Denominator: the matching page views or impressions.
5. Scope: site, page, country, device, and ad-unit filters.

Recalculate the formula in a spreadsheet and allow only for displayed rounding.

What RPM cannot establish

• Tomorrow's demand
• A niche's ad price
• Cost per click
• Finalized payment
• Overall site growth

Google describes RPM as estimated, not actual earnings, and useful for comparison. Estimated and finalized earnings are separate stages. Earnings and payments

Compare like with like

There is no universally correct 30- or 90-day window. Use the same period and filters for the question being tested. Always show the denominator and actual estimate next to RPM.

Takeaway

A high RPM can be a tiny estimate scaled from a tiny denominator. Fix the metric, period, numerator, denominator, and filters, then recalculate before interpreting the number.