Margin Math Before Media Spend: A 5-Minute Arbitrage Check

I wrote this because I kept seeing campaigns fail before they even started.

This is a condensed version. The full guide has the complete framework and examples.

Here is the quick check I use:

Profit per visitor = Revenue per visitor - Cost per visitor

Margin % = Profit per visitor / Revenue per visitor

If CPC is $0.45 and revenue per visitor is $0.70:

• Profit = $0.25
• Margin = 35.7%

Then I stress test:

• CPC +15%
• Revenue -15%
• If margin breaks, no launch.

Full walkthrough: how to calculate arbitrage margins

Leave your toughest question in the comments and I’ll answer it.