How much should you spend on ads?
Short answer: spend as much as you can while each customer still costs less than they are worth. The right budget follows your unit economics — break-even CPC, conversion rate, and margin — not a one-size-fits-all percentage of revenue.
“Spend 10% of revenue on marketing” is the advice you will hear most, and it is the least useful. It ignores whether your ads are actually profitable. A better approach starts from the math and works outward.
Step 1: Confirm the unit economics work
Before scaling anything, make sure your actual CPC sits below your break-even CPC. If a click is profitable, more clicks means more profit — and budget becomes a growth decision, not a gamble.
Step 2: Forecast before you commit
Use a budget to estimate clicks, conversions, revenue, and profit so you are not flying blind. The ad budget forecast calculator turns a spend figure into expected outcomes in seconds.
Step 3: Scale in steps, watch payback
- Increase budget gradually (20–30% at a time) so performance has room to stabilize.
- Watch CAC payback — a profitable ratio with a long payback can still strain cash flow.
- Stop scaling a channel when its marginal ROAS drops below break-even.
FAQ
What if I have no data yet?
Start small, gather conversion-rate and CPC data, then size the budget from real numbers.
Should budget be fixed monthly?
Treat it as a dial tied to profitability, not a fixed line item — scale up while clicks stay profitable.