Answer first
What this calculator tells you
Calculate click-through rate, cost per click, cost per thousand impressions and cost per conversion. Compare ad campaigns on the same four metrics. Formula: CTR = clicks ÷ impressions; CPC = spend ÷ clicks; CPM = spend ÷ impressions × 1,000; cost per acquisition = spend ÷ conversions. At the worked-example inputs, the click-through rate is 1.5%. Holding every other input steady, moving impressions from 200,000 to 300,000 moves the result from 1.3% to 1.9%.
Transparent method
The formula
Compare ad campaigns on the same four metrics.
Worked example
Example inputs
How to interpret the result
Four numbers describe an ad campaign from different sides. Click-through rate shows whether the ad draws attention, cost per click prices that attention, cost per thousand impressions prices reach, and cost per conversion prices the result. On 250,000 impressions, 3,750 clicks and $4,200 spent, the rates are 1.5 percent, $1.12 a click, $16.80 per thousand and $28 per conversion.
At the worked-example inputs the click-through rate is 1.5%. It rises with clicks and falls as impressions increases; ad spend and conversions do not move it.
These are planning metrics, not audited accounting or a valuation opinion.
Before you rely on it
What to check
Compare campaigns on cost per conversion first. A cheap click that never converts is worse than an expensive one that does.
The common error
Where people go wrong with marketing metrics calculator
Optimizing for click-through rate alone. A high rate on the wrong audience pays for visits that never turn into customers.
Sensitivity evidence
How impressions changes the click-through rate
Holding every other input at the worked-example value, moving impressions from 200,000 to 300,000 moves the click-through rate from 1.3% to 1.9%: a spread of 0.625%, or 42% of the worked-example result.
| Impressions | Click-through rate | Cost per click | Cost per 1,000 impressions | Cost per conversion |
|---|---|---|---|---|
| 200,000 | 1.9% | $1.12 | $21 | $28 |
| 225,000 | 1.7% | $1.12 | $19 | $28 |
| 250,000worked example | 1.5% | $1.12 | $17 | $28 |
| 275,000 | 1.4% | $1.12 | $15 | $28 |
| 300,000 | 1.3% | $1.12 | $14 | $28 |
Every input, tested
Which input moves the click-through rate most
Of the 4 inputs, impressions moves the click-through rate most (0.303% across the range tested) and clicks moves it least (0.300%). Ad spend and conversions do not change it at all.
| Input | Tested from | To | Click-through rate at each end | Swing |
|---|---|---|---|---|
| Impressions | 225,000 | 275,000 | 1.7% to 1.4% | 0.303% (20%) |
| Clicks | 3,375 | 4,125 | 1.4% to 1.7% | 0.300% (20%) |
| Ad spend | $3,780 | $4,620 | 1.5% to 1.5% | none |
| Conversions | 135 | 165 | 1.5% to 1.5% | none |
Two variables at once
Click-through rate by impressions and clicks
Across the grid the click-through rate runs from 1.0% to 2.3%. Moving impressions from 200,000 to 300,000 shifts it by 0.625% at the middle column, and moving clicks from 3,000 to 4,500 shifts it by 0.600% at the middle row, so impressions is the bigger lever here.
| Impressions \ Clicks | 3,000 | 3,750 | 4,500 |
|---|---|---|---|
| 200,000 | 1.5% | 1.9% | 2.3% |
| 225,000 | 1.3% | 1.7% | 2.0% |
| 250,000 | 1.2% | 1.5% | 1.8% |
| 275,000 | 1.1% | 1.4% | 1.6% |
| 300,000 | 1.0% | 1.3% | 1.5% |
The highlighted cell is the worked example: 1.5%.
Step by step
The worked example, input by input
| Input | Value used | What it means |
|---|---|---|
| Impressions | 250,000 | Enter the impressions used in this calculation. |
| Clicks | 3,750 | Enter the clicks used in this calculation. |
| Ad spend | $4,200 | Enter the ad spend used in this calculation. |
| Conversions | 150 | Enter the conversions used in this calculation. |
| Click-through rate | 1.5% | |
| Cost per click | $1.12 | |
| Cost per 1,000 impressions | $17 | |
| Cost per conversion | $28 | |
Inputs, definitions and assumptions
Impressions
Enter the impressions used in this calculation. The prefilled worked-example value is 250,000.
Clicks
Enter the clicks used in this calculation. The prefilled worked-example value is 3,750.
Ad spend
Enter the ad spend used in this calculation. The prefilled worked-example value is $4,200.
Conversions
Enter the conversions used in this calculation. The prefilled worked-example value is 150.
How to use this calculator
- 1Verify the inputs. Gather impressions, clicks, ad spend and conversions from your own documents; the prefilled values are examples.
- 2Save a baseline. The worked example puts the click-through rate at 1.5%. Store your own version of it as Scenario A.
- 3Test one change. Start with impressions, the input with the biggest effect here: moving impressions from 225,000 to 275,000 takes the click-through rate from 1.7% to 1.4%, a swing of 20% of the worked-example figure.
- 4Check the extremes. At half the example impressions (125,000) the click-through rate is 3.0%; at double (500,000) it is 0.750%.
People also ask
Frequently asked questions
How do you calculate marketing metrics?
CTR = clicks ÷ impressions; CPC = spend ÷ clicks; CPM = spend ÷ impressions × 1,000; cost per acquisition = spend ÷ conversions. Enter ad spend in dollars. At the worked-example inputs the click-through rate is 1.5%.
What does the marketing metrics result mean?
Compare ad campaigns on the same four metrics. At the worked-example inputs the click-through rate is 1.5%. It rises with clicks and falls as impressions increases; ad spend and conversions do not move it.
How much does impressions change the click-through rate?
Holding every other input at the worked-example value, moving impressions from 200,000 to 300,000 moves the click-through rate from 1.3% to 1.9%, a spread of 0.625%.
What are the limits of this marketing metrics calculator?
These are planning metrics, not audited accounting or a valuation opinion. The tables on this page test impressions only from 200,000 to 300,000; a value outside that range is not tabulated here.
Which input moves the click-through rate most in the marketing metrics calculator?
Ranked by how far each moves the click-through rate across the range tested: impressions (0.303%, 20%) and clicks (0.300%, 20%). Ad spend and conversions do not change it.
If I double impressions in the marketing metrics calculator, does the click-through rate double?
Doubling it from 250,000 to 500,000 takes the click-through rate from 1.5% to 0.750%, which is 0.50 times the worked-example figure. So it falls instead of rising. Halving it to 125,000 gives 3.0%.
How much does clicks matter in the marketing metrics calculator?
The worked example uses 3,750. Holding every other input at its worked-example value, moving clicks from 3,375 to 4,125 takes the click-through rate from 1.4% to 1.7%, a swing of 20% of the worked-example figure.
How much does ad spend matter in the marketing metrics calculator?
The worked example uses $4,200. The click-through rate does not depend on ad spend; it moves the cost per click from $1.01 to $1.23 instead when ad spend goes from $3,780 to $4,620.
How much does conversions matter in the marketing metrics calculator?
The worked example uses 150. The click-through rate does not depend on conversions; it moves the cost per conversion from $31 to $25 instead when conversions goes from 135 to 165.
Which inputs change the cost per click in the marketing metrics calculator?
At the worked-example inputs it is $1.12. Clicks takes it from $1.24 to $1.02 and ad spend takes it from $1.01 to $1.23.
Which inputs change the cost per 1,000 impressions in the marketing metrics calculator?
At the worked-example inputs it is $17. Impressions takes it from $19 to $15 and ad spend takes it from $15 to $18.
Which inputs change the cost per conversion in the marketing metrics calculator?
At the worked-example inputs it is $28. Ad spend takes it from $25 to $31 and conversions takes it from $31 to $25.
How often should I review my prices and costs?
At least every quarter, and whenever a major cost changes. Costs drift upward between reviews and quietly erode margin, while prices left unchanged do not keep up.
Sources and evidence
Free Calculators Online is independent and is not affiliated with or endorsed by the source organizations. Educational estimates only.