Everyday cpa (cost per acquisition) problems come down to one relationship between 3 figures. This calculator takes total attributed conversions, average cost per click (cpc), number of clicks and turns them into cost per acquisition (cpa) and total ad spend, with the working shown so you can check the result rather than simply trust it.
What Is the CPA (cost per Acquisition) Calculator?
It is built around cost per acquisition (cpa), total ad spend, and it works the same way whether you are checking a homework answer, confirming a colleague's figure, or working something out for yourself. Everything runs in your browser, so nothing you enter is uploaded anywhere.
How the CPA (cost per Acquisition) Calculation Works
The steps are applied in order, so an output that depends on another output updates as soon as the underlying figures change.
The relationship between total attributed conversions, average cost per click (cpc), number of clicks and cost per acquisition (cpa), total ad spend is fixed, so the same figures always give the same answer. That makes it a good cross-check: run the numbers a second way and see whether the result agrees.
Getting a Result You Can Trust
For anything that matters, write the inputs down next to the result. A calculation you can reproduce is worth far more than a number you cannot explain, and it takes a moment to record total attributed conversions and average cost per click (cpc) and number of clicks alongside cost per acquisition (cpa), total ad spend.
Frequently Asked Questions
What do I need to work out cost per acquisition (cpa)?
Enter total attributed conversions, average cost per click (cpc), number of clicks. The calculator then works through the relationship and reports cost per acquisition (cpa), total ad spend.
What does the cpa (cost per acquisition) actually calculate?
It takes total attributed conversions and average cost per click (cpc) and number of clicks and converts them into cost per acquisition (cpa), total ad spend using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter total attributed conversions?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.
Can I use this for a quick estimate as well as a precise answer?
Yes. The calculator is built for quick checks, so round your inputs to a sensible number of significant figures and the result will be just as useful. If you need more precision, keep the same method and add digits to the inputs rather than adjusting the method itself.