How Much Should You Spend on Facebook Ads? (2026 Guide)

The honest answer is that there is no universal number, but there is a sensible framework. After managing over $100M in ad spend, here is how we set budgets for ecommerce brands.

Start with what you can afford to lose while testing

Before you scale, you are buying data. Budget enough to get statistically meaningful results: a rough rule is to spend roughly 3x to 5x your target cost per acquisition per ad set per week so the algorithm has room to learn. If your target CAC is $30, that means about $90 to $150 per ad set weekly during testing.

Anchor the budget to your margins, not your competitors

Your real ceiling is your contribution margin. If you make $40 of profit on a $90 product before ad spend, you can pay up to $40 to acquire a customer and break even, and you want to be well under that. A profit-first agency builds the budget around your margins, AOV and repeat-purchase rate, which is the approach we take on every account.

Scale only what is already profitable

Increase spend on winners in measured steps (20 to 30 percent every few days) so you do not reset the learning phase. Kill or rework anything below your break-even ROAS quickly.

A simple starting point

Most DTC brands we work with start somewhere between $3k and $10k per month, scaling as ROAS holds. The number matters less than the structure: clean tracking, tested creative, and disciplined scaling.