Introduction
CPM (Cost Per Mille) is the foundation of YouTube ad economics. It is what advertisers pay per 1,000 ad impressions on your videos — not what you receive. Knowing your CPM is the first step to forecasting creator income.
Definition
CPM = the price an advertiser pays YouTube for 1,000 monetized ad impressions on a video.
CPM vs RPM Quick Table
| Metric | What It Measures | Who It Belongs To |
|---|---|---|
| CPM | Advertiser cost per 1,000 ad impressions | YouTube/advertiser metric |
| RPM | Revenue per 1,000 video views (post-split) | Creator's actual earnings |
Why It Matters
Niche CPM ranges differ by 10x. A finance channel may earn $20–$50 CPM; an entertainment channel $1–$4 CPM. Two creators with identical views can earn wildly different revenue.
How It Works
- Advertisers bid in Google Ads auctions to show in front of your viewers.
- The winning bid determines what they pay per 1,000 impressions.
- YouTube keeps 45% of ad revenue; creator receives 55% (per YouTube Partner Program terms).
- Only monetized views (ads actually shown) count toward CPM.
Formula
CPM
$$ \text{CPM} = \frac{\text{Ad Revenue}}{\text{Monetized Impressions}} \times 1000 $$
Creator Earnings
$$ \text{Earnings} = \frac{\text{Monetized Views}}{1000} \times \text{CPM} \times 0.55 $$
Variable Definitions
- Monetized Impressions — ad views (not video views)
- 0.55 — creator's 55% share of ad revenue
- CPM — what advertisers pay (gross, before YouTube split)
Worked Example
A tech channel video gets 100,000 views. 40% are monetized → 40,000 monetized impressions. CPM is $8.
- Gross ad revenue: (40,000 ÷ 1000) × $8 = $320
- Creator earnings: $320 × 0.55 = $176
- Effective RPM: $176 ÷ (100,000 ÷ 1000) = $1.76
What Drives CPM
| Factor | Impact |
|---|---|
| Niche (finance, B2B, insurance) | Highest |
| Geography (US, UK, AU, CA viewers) | Highest |
| Season (Q4 ad spend) | +30–60% |
| Video length (8+ min for mid-rolls) | Higher |
| Advertiser-friendly content | Higher |
Common Mistakes
- Confusing CPM with creator earnings (use RPM for take-home)
- Believing every view earns money — only monetized impressions do
- Ignoring seasonality when budgeting
Related Calculators
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Conclusion
CPM measures advertiser cost, not your paycheck. Use RPM for actual income forecasting and diversify beyond ads with sponsorships, memberships, and affiliate revenue.