Google Ads Marginal CAC Calculator

by conorhughesuk · Workflow & Planning

Manifest V3 Free

View in Chrome Web Store Data as of 17 Oct 2026

Automatically calculates and displays marginal CAC when adjusting Target CPA in Google Ads

Users

−1 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#225K

#189K among extensions

Version

1.0.0

updated 4 Jan 2026

Users

monthly, 10 months

Latest, 17 Oct 2026: 7 usersMove the mouse over the chart for any month

Ratings count

monthly, 10 months

Latest, 17 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Google Ads Marginal CAC Calculator

Automatically converts the "get an additional X conversions for Y cost" to a marginal acquisition cost in Google Ads - really useful for getting a feel of where your optimal Target CPA should be. When you click 'Edit Target CPA' in Google Ads, you'll automatically see the Marginal CAC calculated and added into your budget popup. Please note - the marginal cost and conversion increases are calculated by Google Ads. It's up to you to judge how accurate they are.