Budget your ad spend from margin, not hope

Most stores set an ad budget by gut and hope sales show up. The disciplined way runs backward: margin and payback tolerance set a hard CAC ceiling, and that sets the budget.

Guessing an ad budget is how stores overspend into unprofitable CACs, or underspend and stall. Work backward instead: contribution margin plus your payback window gives an affordable CAC. Affordable CAC times target new customers is the budget ceiling. AI does the arithmetic from your numbers and hands the ROAS floor to marketing.

Most stores set an ad budget by gut ("let's try $5k this month") and then hope the sales show up.

The disciplined way runs backward: your margin, and how long you'll wait to break even, set a hard ceiling on what you can spend to acquire a customer. That ceiling sets the budget.

What you'll learn

Start from contribution margin, not revenue
Set your payback tolerance, then compute affordable CAC
Budget ceiling = affordable CAC x target new customers
Scale only while payback holds