CPM is a buyer metric: cost per thousand ad impressions. Not every view gets an ad. Not every ad impression pays the same. RPM folds those realities into a per-view-thousand number creators actually feel. This calculator lets you model CPM × fill rate × share so you can explain the gap in a client deck.
How to use this tool
- Enter views and assumed CPM.
- Set a fill rate (percent of views with a paid impression).
- Set a creator share assumption for the scenario.
- Read estimated revenue and implied RPM.
Why CPM tweets confuse teams
An agency quotes $25 CPM. The creator sees $4 RPM. Both can be true. Fill rate, ad types, and YouTube’s share sit in the middle. Always label which metric you are using in a forecast.
Professional notes
- Use conservative fill rates for highly skippable inventory.
- Seasonality (Q4) can move CPM without you changing content.