# Cost Per Mille

**Acronym:** CPM  
**Category:** metrics  
**Short Description:** The cost to deliver 1,000 ad impressions to target audience.  
**Last Updated:** 2026-05-16T12:00:00Z

## Definition

Cost Per Mille (CPM) represents the cost an advertiser pays to deliver 1,000 ad impressions to their target audience. This metric is fundamental for media planning and buying, enabling comparison of advertising costs across different platforms, formats, and audience segments. CPM pricing reflects placement quality, audience targeting precision, and market demand.

## Formula

**Formula:** `CPM = (Total Ad Spend / Total Impressions) × 1,000`
**Result Unit:** $

Cost to deliver one thousand ad impressions.

## Calculation

**Formula:** `CPM = (Total Ad Spend / Total Impressions) × 1000`

**Explanation:** Divide total advertising spend by number of impressions delivered, then multiply by 1000 to get cost per thousand impressions.

### Components

- **Total Ad Spend**: Total cost of the advertising campaign
- **Total Impressions**: Number of ad impressions delivered

## Industry Benchmarks

| Segment | Typical Range | Median | Notes |
| --- | --- | --- | --- |
| LinkedIn (B2B, US) | $30 – $50 | $41.24 | Premium professional inventory and tight job-title targeting drive the highest CPMs in paid social. |
| Facebook — Beauty & Health | $10 – $14 | $12.46 | DTC competition during launch cycles and influencer-adjacent audiences pushes auction prices up. |
| Facebook — E-commerce / Retail | $8 – $12 | $10.00 | Heavy seasonal bidding (Q4, Black Friday) keeps CPMs elevated year-round in retail-heavy auctions. |
| Facebook — Hardware / Automotive | $5 – $8 | $6.96 | Lower auction density and fewer DTC entrants leave inventory cheaper to reach. |
| TikTok (cross-industry) | $6 – $14 | $9.16 | Cheaper than Meta on average, but rising fast — up 16% YoY in 2025 reporting. |
| Google Display Network | $3 – $10 | $3.12 | Programmatic display inventory remains the cheapest broad-reach option, with quality tradeoffs. |

**Sources:** TA Monroe / Cometly 2024, Digital Applied / Lebesgue 2024, WordStream 2024, Digital Applied 2024, Triple Whale 2024, WordStream / Smart Insights 2024

## Examples

- A $50 campaign with 10,000 impressions has a $5 CPM
- CPMs vary significantly by placement, audience, and platform
- Higher CPMs often indicate more premium or targeted placements

## How AdSights Helps

**Tracking Cost Per Mille:** CPM rises when creative engagement falls — platforms charge more per impression for ads that earn fewer reactions, video views, and clicks. AdSights monitors creative-element performance over time, flagging when specific hooks, formats, or visual treatments start losing engagement so teams can retire fatigued variants before CPM inflation eats the budget. By mapping every variant's components to delivered CPM, AdSights also shows which production styles consistently earn cheaper impressions in a given audience — informing not just which ads to scale, but which patterns to brief into the next creative round to keep media costs in check.

## FAQs

### What is a good CPM?

Heavily channel-dependent. On Facebook, $8–$15 is the typical range across industries, with $10 a reasonable median. TikTok averages around $9. LinkedIn runs $30–$50 because you're paying for professional targeting precision. Display can land under $5. Rather than chase a low CPM in isolation, evaluate it against CTR and conversion rate — a $20 CPM that delivers a 3% CTR and converts well is cheaper effective traffic than an $8 CPM with a 0.5% CTR.

### Why is my CPM so high?

Five common causes: (1) Narrow audience — small custom audiences and tight job-title stacks force the auction to compete harder for limited inventory. (2) Conversion-optimized objectives — bidding for purchases or leads costs more per impression than reach campaigns. (3) Seasonality — Q4 retail, tax season finance, back-to-school education all see CPM spikes. (4) Creative fatigue — when CTR drops, platforms charge more per impression to compensate. (5) Competitor pressure — a new entrant with deep pockets in your auction raises everyone's CPM.

### How is CPM different from CPC?

CPM is what you pay per 1,000 impressions; CPC is what you pay per click. They're directly linked by CTR — effective CPC equals CPM divided by CTR, then divided by 10. A $12 CPM and a 2% CTR produces a $0.60 CPC; the same $12 CPM with a 1% CTR doubles your CPC to $1.20. Most modern auction platforms charge on impressions under the hood regardless of which objective you select, which is why creative quality (and the CTR it produces) is the most reliable lever for lowering effective cost.

### How do I calculate CPM?

CPM = (total spend ÷ total impressions) × 1,000. If you spent $500 and served 100,000 impressions, your CPM is $5. The 'M' in CPM is the Roman numeral for thousand, not 'million' — a common point of confusion. Most ad platforms display CPM automatically. When comparing across platforms, make sure you're comparing the same audience size and objective — a $15 CPM on a narrow retargeting audience isn't comparable to a $15 CPM on a broad prospecting audience.

### How do I lower CPM on Facebook?

The highest-leverage moves: (1) Broaden the audience — Advantage+ and broad targeting almost always carry lower CPMs than narrow saved audiences. (2) Refresh creative regularly — fatigued ads see CPMs creep up because Meta charges more to keep serving low-relevance impressions. (3) Test the reach objective for top-of-funnel campaigns where you don't need conversion optimization. (4) Avoid over-restrictive placements; opening Advantage+ placements (Reels, Audience Network) usually lowers blended CPM. (5) Improve thumbstop and CTR — Meta rewards engagement-positive ads with cheaper inventory.

## Related Terms

### Similar Terms

- **[Cost Per Click (CPC)](/resources/glossary/metrics/cost-per-click-cpc)**: CPM × CTR determines effective CPC in impression-based buying

### Component Terms

- **[Click-Through Rate (CTR)](/resources/glossary/metrics/click-through-rate-ctr)**: CTR efficiency justifies higher CPMs through improved conversion performance
- **[Impressions](/resources/glossary/metrics/impressions)**: Viewable ad deliveries that form the basis of CPM calculation
- **[Cost Per Action](/resources/glossary/metrics/cost-per-action-cpa)**: CPM is an early indicator of potential CPA
- **[Reach](/resources/glossary/metrics/reach)**: CPM efficiency affects maximum reach potential through auction dynamics
- **[Ad Frequency](/resources/glossary/metrics/ad-frequency)**: CPM costs influence optimal frequency strategies

## Related Resources

- [CPM Calculator](/resources/tools/calculators/cpm-calculator) - Calculate and analyze your CPM metrics, including CTR, CPC, CVR and more