Calculating your cost per 1000 impressions (cpm) is straightforward once you know the CPM formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the CPM Calculator.
What is CPM?
The CPM calculation tells you your cost per 1000 impressions (cpm) from a few simple inputs. The figure you are solving for here is the cost per 1000 impressions (cpm), expressed in INR.
The CPM formula
The core formula is:
Cost per 1000 impressions (CPM) = Total ad spend ÷ Total impressions × 1000Here is what each input means:
- Total ad spend — a money amount. Example: ₹5,000.
- Total impressions — a number. Example: 25,000.
How to calculate it step by step
- Write down the total ad spend (for example, ₹5,000).
- Write down the total impressions (for example, 25,000).
- Apply the formula above to get your cost per 1000 impressions (cpm).
- Double-check the result with the CPM Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Total ad spend | ₹5,000 |
| Total impressions | 25,000 |
| Cost per 1000 impressions (CPM) | ₹200.00 |
With total ad spend of ₹5,000 and total impressions of 25,000, the cost per 1000 impressions (cpm) works out to ₹200.00.
Example 2
With total ad spend of ₹10,000 and total impressions of 25,000, the cost per 1000 impressions (cpm) works out to ₹400.00.
| Result | Value |
|---|---|
| Cost per 1000 impressions (CPM) | ₹400.00 |
Example 3
With total ad spend of ₹2,500 and total impressions of 25,000, the cost per 1000 impressions (cpm) works out to ₹100.00.
| Result | Value |
|---|---|
| Cost per 1000 impressions (CPM) | ₹100.00 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the CPM Calculator does it instantly, for free, with the formula and a worked example built in.
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