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CPM calculator

Compute the cost per thousand impressions (CPM) of an ad campaign.

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The CPM calculator turns Campaign cost, Impressions into CPM, instantly and for free. For instance, with Campaign cost = $500.00 and Impressions = 100,000 it returns CPM = $5.00.

How to use it

  1. Enter your values: Campaign cost, Impressions.
  2. Read the result instantly: CPM.

Frequently asked questions

What does the CPM calculator actually compute?

It takes Campaign cost and Impressions and derives CPM from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

2 values: Campaign cost ($) and Impressions. Nothing else is required — no account, no file upload.

Can you show a worked example?

With Campaign cost = $500.00 and Impressions = 100,000, the calculator returns CPM = $5.00. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

When would I actually use this?

Before and after a campaign: turning a target into a daily budget, comparing two channels on the same basis, and deciding whether the return justifies continuing.

What is the most common mistake?

Judging ROAS without subtracting the cost of goods. A 3× return on ad spend is a loss whenever the margin is under a third — the ratio says nothing about profit on its own.

What is the difference between the CPM calculator and the Ad Cost Calculator (CPM, CPC, CPA, CTR)?

This one returns CPM; the Ad Cost Calculator (CPM, CPC, CPA, CTR) returns CPM (cost per 1,000 impressions) and CPC (cost per click). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Impressions from reach and frequency is the closest one after this: Calculate total ad impressions from unique reach and average frequency.

What else is worth having open alongside it?

Cost per lead (CPL) calculator and CPC calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from, and how current are they?

The formulas are the industry-standard ones every ad platform uses; the inputs come from your own reporting. Platforms differ in attribution window and in what counts as a conversion, so figures rarely reconcile exactly between them.

Further reading

All guides →
ComparisonCPM vs CPC: What You Are Actually Paying ForCPM and CPC are not two prices for the same thing. They are the same auction seen from two sides, and click-through rate is the exchange rate between them — so the cheaper option flips as soon as CTR moves.ExplainerImpressions, Reach and Frequency Are Three Numbers, and You Need All ThreeImpressions divided by reach is frequency — one identity that decides what a campaign actually is. The same impression budget split five ways, what a frequency cap really costs you, and why the three-exposure rule is a 1970s heuristic rather than a law.ExplainerCost Per Click, and What You Are Actually Bidding AgainstYour bid decides whether you are eligible; the advertiser below you decides what you pay. Doubling a bid can move the price not at all, quality can halve it for the same position, and the average CPC in your report is a click-weighted mixture that describes no query. The auction arithmetic, worked.ExplainerWhat an Influencer Earnings Calculator Is Really EstimatingThese tools multiply followers by an assumed rate per thousand, which makes them a CPM model under another name — and every input behind that rate is an assumption they never show you.ExplainerCPM, CPC and CPA Explained: Which Ad Metric Matters?Understand cost per mille, cost per click and cost per acquisition — how each is calculated, how they relate, and which one to optimize for at each stage of a campaign.ExplainerWhat Is a Break-Even ROAS? (And How to Find Yours)ROAS is revenue divided by ad spend. Learn what break-even ROAS means, how to find it from your profit margin, and why a ROAS above 1 can still lose money.