CPM Calculator: Cost Per Thousand Impressions

Everything runs in your browser. No figure you type is sent anywhere, stored or logged.

How do you calculate CPM?

Divide the cost by the impressions, then multiply by a thousand.

CPM = (total cost / impressions) x 1,000

Spend $2,000 for 250,000 impressions and the CPM is $8.00. The M is the Roman numeral for a thousand, from the Latin mille, which is why it is cost per mille and not cost per million. Rearranged, the same formula answers the other two questions people actually ask:

Impressions = (budget / CPM) x 1,000
Cost = (impressions / 1,000) x CPM

So $1,000 at a $10 CPM buys 100,000 impressions, and a million impressions at a $10 CPM costs $10,000. In a spreadsheet, with cost in column A and impressions in column B:

=IF(B2=0,"",(A2/B2)*1000)

Is CPM charged per impression or per thousand?

You are billed per impression. CPM is just the unit the price is quoted in, because the per impression number is unreadably small. A $9.87 CPM is $0.00987 per impression.

What is the difference between CPM, eCPM and vCPM?

The practical difference: a publisher can have a $20 eCPM on inventory an advertiser bought at a $5 CPM, because eCPM blends several buys and vCPM prices only the impressions someone could actually see. Tab four of the calculator does the publisher side.

What is a good CPM in 2026?

Good means cheap enough that the clicks and conversions it produces still pay. There is no universal number, and anyone quoting one without a platform, an objective, an audience and a date is guessing. Here is what the 2026 sources actually report.

Read these as planning ranges, not quotes. The methodologies are not the same: Gupta Media reports observed spend across tens of billions of impressions, Digital Applied aggregates platform and exchange reports, Adwave reports CTV market pricing. Two other things worth knowing. Connected TV CPMs fell roughly 10 to 30 percent year on year through mid 2025 as Amazon Prime Video, Netflix, Disney+ and free ad supported channels added inventory. And several widely shared CPM tables are badly out of date: one popular calculator page still lists LinkedIn at $6.59, which every 2026 source contradicts by a factor of five.

Why is LinkedIn ten times the CPM of Display?

Because you are not buying impressions, you are buying an audience, and the auction prices that audience. A $3.12 Display impression could be anyone. A $98.40 LinkedIn impression is a named C-suite decision maker at a company you chose. The right comparison is cost per qualified lead, not cost per thousand. In B2B, the expensive impression is frequently the cheap lead.

Does a lower CPM mean a better campaign?

No, and this is the most expensive misconception in media buying. A $40 CPM audience can be far more profitable than a $2 one. Broad, cheap inventory usually reaches people with no interest, so click through rate and conversion rate fall faster than the CPM does. The only honest test is cost per conversion, or cost per qualified lead if a person closes the sale. Use tab two to turn any CPM into the cost per click and cost per acquisition it actually implies.

How do you convert CPM to CPC and CPA?

Three formulas connect the three pricing models, and click through rate and conversion rate are the bridges.

CPC = (CPM / 1,000) / CTR
CPM = CPC x CTR x 1,000
CPA = CPC / conversion rate
CPA = CPM / (CTR x conversion rate x 1,000)

A $9.87 CPM at a 1.49% click through rate is an effective $0.66 cost per click. At a 2.5% conversion rate that is a $26.50 cost per acquisition. Change the click through rate to 0.5% and the same CPM becomes a $1.97 click and a $79 acquisition, on identical impression pricing. That is the whole argument for spending on creative rather than on bid tinkering: doubling click through rate halves your effective cost per click at the same CPM.

When should I buy on CPM instead of CPC?

The break even is easy to work out. At a $10 CPM you need a 0.50% click through rate to match a $2.00 CPC and a 1.00% click through rate to match a $1.00 one. Above that line the CPM buy is cheaper per click. Below it, you are paying the platform for impressions nobody acted on.

Why is my CPM so high, and how do I lower it?

Seven things drive CPM, and only some of them are problems. Work down the list before you change bids.

1. Campaign objective. A conversion objective costs more per thousand than an awareness one, because the platform is finding a much narrower slice of people. Switching objectives mid flight often doubles CPM and that is expected behaviour, not a fault.
2. Audience size and seniority. Narrow audiences cost more, and seniority costs most of all: cross industry LinkedIn is $33.80 while C-suite targeting is $98.40.
3. Retargeting versus prospecting. Retargeting pools are small and every advertiser wants the same people, so retargeting CPM has historically run more than double prospecting CPM on Meta.
4. Geography. The US, UK, Canada and Australia are the expensive markets. The same creative to the same audience profile in a tier two market can cost a fraction.
5. Season. Q4 is the most expensive quarter of the year and January the cheapest, as retail budgets leave the auction. A January versus November comparison is not a like for like one.
6. Creative fatigue and frequency. As frequency climbs past about three, click through rate falls and the auction prices you higher for repeat exposure. Check frequency before blaming the audience.
7. Account level problems. Rejected ads, low ad relevance diagnostics, an unverified domain or pixel issues all raise delivery cost. Check Events Manager diagnostics before assuming the market moved.

What should I actually do about a high CPM?

1. Compare cost per conversion first. If cost per conversion is fine, a high CPM is not a problem.
2. Widen the audience before cutting the budget. Broad targeting with strong creative usually lowers CPM and holds conversion rate.
3. Refresh creative when frequency passes about three. New creative resets both click through rate and delivery cost.
4. Stop overlapping ad sets bidding against each other for the same people. Self competition is a silent CPM tax.
5. Look at unique click through rate rather than raw click through rate on social, so repeat clicks from the same person do not flatter the numbers.
6. Test a cheaper placement before you test a cheaper platform. Shorts, bumpers and native sit well below in-stream and feed placements.
7. In programmatic, do not assume a higher CPM buys better inventory. On open exchange it often does not.

How do publishers use eCPM?

If you sell ad space, the advertiser side formula is not the one you need.

eCPM = (ad revenue / impressions served) x 1,000
Fill rate = (impressions served / ad requests) x 100

eCPM normalises everything into one comparable number, so a CPC deal, a CPA deal and a straight CPM deal can be ranked against each other on the same page. The catch is that eCPM alone can be gamed by raising floor prices: rates go up, fill rate goes down, and total revenue falls while the headline metric improves. Revenue per thousand ad requests is the number that actually pays, and tab four shows it whenever you enter ad requests.

CPM calculator FAQs

Related free tools and guides

Sources