Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
CPM
$6.00
Expected clicks
6,750
Effective cost per click
$0.67
Expected conversions
203
Cost per acquisition
$22.22
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter total spend ($).
- 2Enter impressions.
- 3Enter expected click-through rate (%).
- 4Enter landing page conversion rate (%).
- 5Read your cpm on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Solve for whichever leg you are missing: budget, impressions, or CPM. Useful for sanity-checking a media quote before you sign it.
Worked example
Using the values the calculator loads with:
Inputs
- Total spend: 4500 $
- Impressions: 750000
- Expected click-through rate: 0.9 %
- Landing page conversion rate: 3 %
Results
- CPM: $6.00
- Expected clicks: 6,750
- Effective cost per click: $0.67
- Expected conversions: 202.5
- Cost per acquisition: $22.22
What each field means
Inputs
- Total spend ($)
- The total spend used in the calculation, measured in $. Starts at 4500 $ so you have a working example on load.
- Impressions
- The impressions used in the calculation. Starts at 750000 so you have a working example on load.
- Expected click-through rate (%)
- The expected click-through rate used in the calculation, measured in %. Starts at 0.9 % so you have a working example on load. Accepted range: 0–100 %.
- Landing page conversion rate (%)
- The landing page conversion rate used in the calculation, measured in %. Starts at 3 % so you have a working example on load. Accepted range: 0–100 %.
Results
- CPM
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Expected clicks
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Effective cost per click
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Expected conversions
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Cost per acquisition
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the cpm calculator work?
Solve for whichever leg you are missing: budget, impressions, or CPM. Useful for sanity-checking a media quote before you sign it. The underlying maths is: CPM = Spend ÷ Impressions × 1,000.
What do I need to enter?
4 values: total spend, impressions, expected click-through rate, and landing page conversion rate. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the cpm result mean?
It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). CPM Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/cpm
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/cpm" target="_blank" rel="noopener">CPM Calculator — RevenueLab</a> (2026).</p>
Source: [CPM Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/cpm) (2026).