CPA budget table for a defined conversion count
The arithmetic cost associated with conversions equals conversion count multiplied by average CPA. A target CPA is a planning input or bidding target, not a promise that those conversions will be delivered.
CPA budget table for a defined conversion count
| Assumed average CPA | 10 conversions | 100 conversions | 1,000 conversions |
|---|---|---|---|
| 1.00 | 10.00 | 100.00 | 1000.00 |
| 2.00 | 20.00 | 200.00 | 2000.00 |
| 5.00 | 50.00 | 500.00 | 5000.00 |
| 10.00 | 100.00 | 1000.00 | 10000.00 |
| 25.00 | 250.00 | 2500.00 | 25000.00 |
| 50.00 | 500.00 | 5000.00 | 50000.00 |
| 100.00 | 1000.00 | 10000.00 | 100000.00 |
Formula & method
Conversion-related ad cost = conversion count × average CPA
Average CPA = included ad cost ÷ counted conversionsDefine the action first: a lead, purchase, signup or another tracked event. Use the same conversion definition and cost scope in both the CPA and conversion count. Campaign costs that produce no conversions still belong in the relevant cost total when calculating realized average CPA.
For an estimate, choose a hypothetical average CPA and keep it separate from a platform’s target setting. A target can differ from the observed average, and changing spend does not guarantee a proportional change in conversions.
Worked example
Suppose a campaign costs 900 and records 60 defined purchases. Its observed average CPA is 15.00. A scenario with 80 purchases at that same average would cost 1,200, but it is not a delivery forecast.
What can change the answer
Zero conversions produces no finite observed CPA. Conversion delays, duplicate events, refunds and attribution settings can change the final count.
Sources & definitions
Method checked:
Continue with a related task
CPA Calculator
CPA equals advertising spend divided by tracked actions. A campaign costing 600 with 24 qualifying actions has an average CPA of 25.
Conversion Rate Calculator
Conversion rate equals conversions divided by eligible interactions, multiplied by 100. Forty-two conversions from 1,400 interactions gives 3%.
CPM Calculator
CPM equals advertising spend divided by impressions, multiplied by 1,000. A spend of 1,200 for 400,000 impressions gives a CPM of 3 in the same currency.
CPC Calculator
Average CPC equals advertising spend divided by recorded clicks. Spending 150 for 300 clicks gives an average CPC of 0.50.