How to use the CPM calculator
- Pick what you want to find: CPM, ad spend or impressions.
- Enter the other two values from Ads Manager for the same date range.
- Read the result and the formula line under it, which shows exactly what was calculated.
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Free CPM Calculator
Work out cost per thousand impressions, the budget you need or the impressions you'll get. Enter any two values and the third is calculated.
Direct answer
How is CPM calculated?
CPM (cost per mille) is what you pay for 1,000 ad impressions: ad spend ÷ impressions × 1,000. Spending $250 for 50,000 impressions is a $5 CPM. The same equation rearranged gives the ad spend you need (CPM × impressions ÷ 1,000) or the impressions a budget buys (spend ÷ CPM × 1,000).
Formula
CPM = ad spend ÷ impressions × 1,000CPM calculator
Choose what you want to find, enter the other two values, and the result updates as you type.
Your CPM
$5.00
$250.00 ÷ 50,000 impressions × 1,000
New to CPM? Read what CPM means and what moves it, then follow the chain to clicks with the CTR calculator.
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Calculator guide
Using CPM to plan ad budgets
Updated
The CPM equation in three directions
| You want | Equation | Example |
|---|---|---|
| CPM | spend ÷ impressions × 1,000 | $250 ÷ 50,000 × 1,000 = $5.00 |
| Ad spend | CPM × impressions ÷ 1,000 | $5.00 × 120,000 ÷ 1,000 = $600 |
| Impressions | spend ÷ CPM × 1,000 | $600 ÷ $5.00 × 1,000 = 120,000 |
Planning a test budget with CPM
Before a creative test, decide how many impressions each ad needs before you judge it, then use CPM to price the test. With 5 ads, 5,000 impressions each and an expected $12 CPM, the test costs 5 × 5,000 × $12 ÷ 1,000 = $300.
| Ads in the test | Impressions per ad | CPM | Test budget |
|---|---|---|---|
| 3 | 5,000 | $12 | $180 |
| 5 | 5,000 | $12 | $300 |
| 5 | 10,000 | $12 | $600 |
| 10 | 5,000 | $15 | $750 |
From CPM to cost per click and cost per sale
CPM is only the price of reach. Cost per click = CPM ÷ (CTR × 10) when CTR is a percentage, and cost per acquisition = cost per click ÷ conversion rate. Use the CTR calculator and CPA calculator to follow the chain through, and read the CPM glossary entry for what drives CPM up or down.
Tool questions
CPM Calculator FAQ
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