vCPM vs CPM

vCPM vs CPM: Standard vs Viewable Impressions

Standard CPM counts every impression where your ad was technically served — even if it appeared below the fold and was never seen by human eyes. vCPM (Viewable CPM) only counts impressions that met the MRC viewability standard: at least 50% of the ad was visible for at least 1 second. vCPM emerged as advertisers demanded accountability for the fact that a significant portion of "served" impressions were never actually viewed.

What is vCPM?

vCPM (Viewable CPM) is a pricing model that only charges for impressions that met a minimum viewability standard — the ad was on-screen for a qualifying duration.

Full vCPM definition

What is CPM?

Standard CPM (Cost Per Mille) charges for all 1,000 served impressions, regardless of whether the ad was actually in the user's viewport or visible for any meaningful time.

Full CPM definition

vCPM vs CPM: Key Differences

Aspect

vCPM

CPM

Impression counted when

Ad is 50%+ in view for ≥1 second (display)

Ad is technically served to the page

Typical viewability rate

100% by definition

Industry average ~50–60%

Price vs. standard CPM

Higher CPM (premium inventory)

Lower base CPM

Waste reduction

Eliminates paying for unseen ads

Includes below-fold, hidden placements

Availability

Google Display Network, select programmatic

Universal across all display buying

When to use vCPM

Brand campaigns where actual visibility and ad recall matter
You want assurance that your budget is only spent on genuinely seen impressions
Premium display buys where viewability is a contractual requirement

When to use CPM

Performance campaigns where clicks (not views) are the actual goal
Programmatic campaigns where vCPM inventory is limited
When the volume of impressions matters more than guaranteeing each one was seen

Verdict

vCPM is the superior model for brand awareness campaigns because it eliminates spending on ads that nobody saw. It typically costs more per impression but delivers more value per dollar. Standard CPM remains common in programmatic buying and performance campaigns where viewability is less critical than click or conversion volume. For brand advertisers, moving from CPM to vCPM bidding on Google Display is a straightforward quality upgrade.