Introduction
Many creators quote CPM when they should be quoting RPM. The two numbers measure different things, and confusing them leads to overestimated income forecasts.
Definitions
- CPM (Cost Per Mille): What advertisers pay per 1,000 monetized ad impressions.
- RPM (Revenue Per Mille): What the creator actually earns per 1,000 video views, after YouTube's 45% cut and across all views (not just monetized ones).
Comparison Table
| Metric | Counts | Includes Split | Reflects |
|---|---|---|---|
| CPM | Monetized impressions only | No (gross) | Advertiser cost |
| RPM | All video views | Yes (creator's 55%) | Creator income |
Why It Matters
CPM is always larger than RPM. A $10 CPM does not equal $10 per 1,000 views in your pocket — typical RPM on a $10 CPM channel is $2–$4 after the platform split and unmonetized views.
How They Work
CPM is reported by Google Ads as the auction-clearing price for advertisers. RPM is reported in YouTube Analytics under Revenue and includes all monetization (ads, Premium, memberships, Super Chat).
Formulas
CPM
$$ \text{CPM} = \frac{\text{Gross Ad Revenue}}{\text{Monetized Impressions}} \times 1000 $$
RPM
$$ \text{RPM} = \frac{\text{Total Creator Revenue}}{\text{Total Views}} \times 1000 $$
Worked Example
Video stats:
- Total views: 100,000
- Monetized impressions: 40,000
- Gross ad revenue: $320
- CPM = (320 ÷ 40,000) × 1000 = $8
- Creator share: $320 × 0.55 = $176
- Plus $20 Premium share = $196
- RPM = (196 ÷ 100,000) × 1000 = $1.96
CPM is $8; RPM is $1.96. The gap is real and structural.
Why the Gap Exists
- Monetized rate: Often only 40–70% of views are monetized.
- Revenue split: YouTube keeps 45%.
- All views in denominator: RPM divides by total views, not just monetized.
Common Mistakes
- Using CPM × views to estimate income (off by 2–5x)
- Assuming all views are monetized
- Forgetting that ad blockers, kid-directed content, and unsuitable content remove monetization
When to Use Each
| Use Case | Metric |
|---|---|
| Negotiating sponsorships | CPV / per-1000-views custom rate |
| Forecasting your income | RPM |
| Benchmarking niche ad strength | CPM |
| Modeling break-even on production | RPM |
Related Calculators
Related Articles
Conclusion
Use RPM, not CPM, to forecast creator income. CPM is a market signal about your audience's value to advertisers; RPM is what you actually take home.