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Blended CPM Calculator

Formula Used
Blended CPM = Σ(CPMᵢ × Impᵢ) ÷ Σ(Impᵢ)
Blended CPM
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weighted average across all campaigns

How Blended CPM Works

Multiple campaign CPMs weighted by impression volume combine into one blended rate.

Blended CPM = Σ(CPMᵢ × Impᵢ) ÷ Σ(Impᵢ)

What is Blended CPM Calculator?

A blended CPM calculator is a free tool that computes the weighted average CPM across multiple campaigns, ad formats, platforms, or placements. It tells you the true overall cost per 1,000 impressions when combining different CPM rates with different impression volumes.

Blended CPM is essential for multi-channel advertisers who run campaigns across several platforms (e.g., Facebook at $7 CPM + Google Display at $3 CPM + LinkedIn at $30 CPM) and need to know their overall cost efficiency. A simple average would be misleading — blended CPM weights by impression volume.

This calculator lets you add multiple campaigns and automatically computes the impression-weighted average. It's also valuable for publishers who serve different ad formats (banner, video, native) and want to understand their overall eCPM across all inventory types.

Blended CPM Calculator Formula

Blended CPM = Σ(CPMᵢ × Impressionsᵢ) ÷ Σ(Impressionsᵢ)
Expanded Formula
Blended CPM = (CPM₁×Imp₁ + CPM₂×Imp₂ + ... + CPMₙ×Impₙ) ÷ (Imp₁ + Imp₂ + ... + Impₙ)
Total Cost Formula
Total Cost = Σ((CPMᵢ × Impressionsᵢ) ÷ 1,000)
Blended CPM Calculation Example

An advertiser runs 3 campaigns: Facebook ($7 CPM, 500K imp.), Google Display ($3 CPM, 1M imp.), and LinkedIn ($30 CPM, 50K imp.). Blended CPM = ($7×500K + $3×1M + $30×50K) ÷ (500K + 1M + 50K) = ($3,500,000 + $3,000,000 + $1,500,000) ÷ 1,550,000 = $5.16 blended CPM. Despite LinkedIn's $30 CPM, the overall blended rate is just $5.16 because it has far fewer impressions.

CPMᵢ
Individual campaign CPM rate
Impᵢ
Impressions for each campaign
Blended
Weighted average CPM across all campaigns

Tips for Managing Blended CPM

Strategies to optimize your overall blended CPM across multi-channel campaigns.

Managing blended CPM helps you understand true campaign efficiency and allocate budget optimally across channels.

Your Progress
0 / 6 strategies
Low CPM doesn't always mean efficient. A $2 CPM with poor targeting may drive worse results than a $15 CPM with precise targeting. Balance CPM with conversion metrics.
Calculate your historical blended CPM to forecast future campaign costs. Multiply blended CPM by target impressions to estimate total budget needed.
If your blended CPM is too high, shift more impressions to lower-CPM channels (if performance allows). Small shifts in impression distribution can meaningfully change blended CPM.
Monitor your blended CPM weekly or monthly. Rising blended CPM indicates either platform cost increases or unfavorable impression mix shifts. Investigate the cause.
Calculate separate blended CPMs for brand awareness campaigns (where CPM matters most) and performance campaigns (where CPA/ROAS matters more). Don't mix them.
Factor in ad tech fees, creative production costs, and agency fees when calculating your true blended CPM. The headline CPM is rarely the full cost.

Blended CPM Calculator FAQ

Common questions about blended CPM, weighted averages, and multi-channel cost optimization.

Average CPM is a simple arithmetic mean: ($7 + $3 + $30) ÷ 3 = $13.33. Blended CPM is a weighted average based on impressions: it accounts for the fact that you had far more $3 impressions than $30 impressions. Blended CPM is always more accurate for decision-making.

Blended CPM tells you the true cost efficiency of your entire media plan. Without it, you can't accurately answer "how much did we pay per 1,000 impressions overall?" A simple average overstates the impact of high-CPM channels with few impressions.

Shift more impressions to lower-CPM channels (while maintaining performance). Negotiate better rates on high-CPM platforms. Increase volume on efficient channels. Remove underperforming high-CPM placements. A 10% impression shift from a $20 CPM to a $5 CPM channel can significantly reduce blended CPM.

No. Low CPM ≠ best results. LinkedIn at $30 CPM may generate 10× more qualified leads than Facebook at $7 CPM. Optimize for your business goal (leads, sales, ROAS), not just CPM. Use blended CPM as one efficiency metric alongside conversion metrics.

Yes! Publishers can calculate blended eCPM across ad formats: (Banner eCPM × banner imps + Video eCPM × video imps + Native eCPM × native imps) ÷ total imps. This gives your overall revenue efficiency per 1,000 impressions across all ad types.