Free tools
The cost per acquisition calculator
Paste your spend and your conversions. Get cost per acquisition by channel, plus the blended figure your board will ask about ten seconds later.
Maya Sorensen
Performance Lead
This is a small tool that does one thing. Paste spend and conversions per channel and it returns cost per acquisition for each, plus the blended number across all of them. No account required and nothing is stored.
Why blended matters
Channel-level cost per acquisition flatters whichever channel gets last-click credit. The blended figure, total spend divided by total conversions, is cruder but harder to argue with, and it is the number that actually moves your payback period.
How to read the gap
If your best channel’s cost per acquisition is far below the blended number, you have a channel that looks efficient because something else is doing the awareness work. That is not a reason to cut the other channels. It is a reason to be suspicious of the attribution.
Run your own numbers through Orbit.
Fourteen days free, every module included and no card needed.