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Ad Click, Impression Cost & CTR Calculator

Compare CPC, CPM and click-through rate from one set of campaign totals.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

CPC divides spend by clicks. CPM divides spend by impressions and multiplies by 1,000. CTR compares clicks with impressions; all counts should use the same campaign window.

CPC = spend ÷ clicks; CPM = spend ÷ impressions × 1,000; CTR (%) = clicks ÷ impressions × 100

Worked example

Enter these known values and leave the other values blank.

Total cost
500 USD
Clicks
1000
Impressions
100000
Cost per click (CPC)
0.5 USD
Click-through rate (CTR)
1 %
Cost per mille (CPM)
5 USD

Assumptions and limitations

  • Inputs describe one consistent reporting period. Review the formula and counting conventions before comparing results.

Common questions

Why can a low CPM still produce expensive clicks?

If few impressions result in clicks, the spend is spread across relatively few clicks. CTR connects the impression cost and click cost.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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