CPM vs CPV: Which Video Cost Metric to Watch
In short: Both metrics price a media buy before anyone converts, but they price different behavior. CPM charges for reach - every thousand impressions served, watched or not. CPV only charges once a platform-defined view threshold is crossed, so it is really a cost of attention, not a cost of delivery. The two move independently: a video can carry a low CPM and a high CPV if most people scroll past before the view threshold, or the reverse if a short, punchy cut gets watched through cheaply. Use CPM when you are buying reach and treat views as a bonus; use CPV when the view itself is the thing you are paying to prove happened.
By the AdFlint research team · Fact-checked against current Google and Meta platform behavior · Last reviewed July 2026
CPM
Cost per thousand impressions, calculated as spend divided by impressions multiplied by one thousand; the price of reaching an audience regardless of response.
It prices attention, not results. The number moves with auction competition, placement mix, seasonality, and creative quality, so a narrow retargeting pool almost always costs more per thousand than broad delivery. The usual mistake is reading a high figure as waste. An expensive audience that buys beats cheap impressions nobody acts on, and cutting cost here often cuts revenue too.
Full definitionCPV
Ad spend divided by video views, where the platform's definition of a countable view, a duration or interaction threshold, determines the denominator.
Its entire meaning sits in that threshold. Google counts a view on skippable in-stream at thirty seconds, or the full ad if shorter, or an interaction; feed placements elsewhere count far briefer watches. The same creative therefore reports very different numbers by surface. The frequent misreading is comparing across platforms or formats without checking what each one calls a view.
Full definitionSide by side.
The differences that actually change what happens in your account.
| CPM | CPV | |
|---|---|---|
| What triggers the charge | The ad is served and counted as an impression, regardless of whether it loads fully or is seen. | A platform-defined view threshold is crossed - a duration watched or an interaction taken. |
| What the number tells you | How expensive it was to put the creative in front of people. | How expensive it was to get people to actually watch it. |
| Sensitive to creative length | No - a 6 second bumper and a 2 minute pre-roll cost the same per thousand impressions. | Yes - a longer video has more room to lose viewers before the countable-view mark, which can raise or lower the rate depending on hook strength. |
| Comparable across placements | Reasonably, since an impression is a consistent unit across most surfaces. | Only if you check the view definition first - in-stream, feed, and Shorts-style placements use different thresholds. |
| What a bad number means | The audience or placement is competitive or narrow, not necessarily that the creative is weak. | People are dropping off before the countable-view mark, which usually points at a weak opening few seconds. |
| Where it shows up in bidding | The default cost basis for most awareness and reach buys. | A bid strategy option on video campaigns aimed at driving watch-through. |
| Failure mode | Reading a high CPM as wasted spend when it is really an expensive but valuable audience. | Comparing CPV across two platforms or formats that count a view differently and drawing a false conclusion. |
What actually separates them.
CPM charges on delivery of the impression itself, while CPV charges only after a platform-specific watch threshold is met, so CPV is a strictly harder bar to clear.
A campaign can hold a stable CPM while its CPV climbs if the hook stops working and people abandon the video earlier, even though delivery cost has not changed.
CPM is directly comparable across almost any placement because an impression is a fixed unit, but CPV is only comparable once you confirm both surfaces define a view the same way.
Bidding to CPM optimizes for cheap delivery and lets the algorithm chase impression volume, while bidding to CPV pushes the algorithm toward people statistically likely to watch through, which usually narrows and shrinks the audience.
CPM tells you nothing about creative quality on its own, while a rising CPV over time is one of the more reliable early signals that a specific cut is fatiguing.
Which one should you use?
Use CPM when
- You are running an awareness or reach campaign and the view itself is not the goal, exposure is.
- You want a cost figure that is stable and comparable across very different placements and formats.
- You are buying a broad audience deliberately and expect the number to run higher as the pool narrows later.
- The creative is short enough that a view threshold would barely differentiate it from a raw impression.
Use CPV when
- You are testing whether a hook actually holds attention past the first few seconds.
- You are paying for video specifically and want the bidder to chase watch-through rather than raw delivery.
- You need to diagnose creative fatigue and CPM alone is not moving while performance is softening.
- You are comparing two edits of the same video and want a behavioral signal, not just a delivery cost.
Common questions.
Why is my CPV so much higher on one placement than another for the same video?
Each surface defines a countable view differently - a longer watch-through requirement on in-stream placements versus a shorter one on feed-style placements. Before concluding the creative performs worse on one surface, check what threshold each platform is actually charging against.
Can a campaign have a good CPM and a bad CPV at the same time?
Yes, and it usually means the ad is cheap to deliver but weak at holding attention once it appears. That combination points at the opening seconds of the creative rather than the targeting or placement.
Should I bid to CPM or CPV for a video campaign?
Bid to CPV when proving the watch itself is the goal, such as validating a new creative concept or building a video remarketing pool. Bid to CPM when the video is a delivery vehicle for a broader awareness push and you do not want the algorithm narrowing the audience just to protect view rate.
Or stop choosing between them.
AdFlint picks the setting, writes the ads, and keeps optimizing inside the Google and Meta accounts you already own.