How Much Should You Actually Spend on Ads? A Framework for Growing Ecommerce Brands

Most ecommerce founders ask this question backwards. They want one number — "what percentage of revenue should go to ads?" — as if the same rule applies at every stage. It doesn't. The right number depends on where your brand actually is, not on a rule you read somewhere.

Why a flat percentage breaks down

A flat rule like "spend 10% of revenue on ads" ignores the two things that actually decide the right number for your brand: how much margin you have to work with, and how far you are from being a known name. A brand doing $300,000 a year and fighting for its first repeat customers has a completely different job than a brand doing $3M a year defending market share it already has. Use the same percentage for both and one of them is either badly overspending or leaving real growth on the table.

Early stage: spend to learn, not to scale

Below roughly $500K a year in revenue, the goal of ad spend isn't growth yet — it's data. You're figuring out which products sell through paid channels, which creative angles actually convert, and what a realistic cost per acquisition looks like for your business. Expect ad spend to run higher as a percentage of revenue here than it will later, often in the 15-20% range, because you're paying a real "tuition" cost to learn what works. Don't judge this stage by ROAS alone — judge it by how fast you're building a repeatable, working campaign structure.

Growth stage: spend to compound what's already working

Once you've found campaigns that reliably convert (usually somewhere past $500K-$1M in revenue), the job changes from learning to compounding. This is where percentage-of-revenue starts to matter less than marginal return: keep pushing budget into a campaign as long as the next dollar in still returns a profitable customer, and pull back the moment it doesn't. Brands in this stage often land in a 10-15% range, but the real signal isn't the percentage — it's whether cost per acquisition is holding steady as spend increases. If CPA climbs sharply every time you add budget, you've hit the ceiling of that audience, not a floor you need to push through.

Mature stage: spend to defend, not just to acquire

Past roughly $3-5M a year, paid ads usually aren't the only thing driving revenue anymore — retention, repeat purchase rate, and brand search all start carrying real weight. Ad spend as a percentage of revenue often drops here, sometimes into the 5-10% range, even as the absolute dollar amount grows, because a larger share of revenue is coming from customers who didn't need a fresh ad to convert. The mistake brands make at this stage is holding onto an early-stage percentage out of habit, which just funds acquisition spend past the point where it's the best use of that money.

What to track instead of a fixed percentage

If you only track one number, make it blended CAC against average order value and repeat purchase rate together, not ad spend as an isolated percentage of revenue. A rising percentage of revenue spent on ads is not a problem if CAC is stable and customers are worth more over time. A shrinking percentage is not a win if it's actually a sign you've stopped acquiring new customers at all.

The bottom line

There's no universal "right" ad spend percentage, because the question itself is the wrong one to lead with. The right question is: what stage is this brand actually in, and is the next marginal dollar of ad spend still buying a profitable customer? Answer that honestly and the percentage takes care of itself.

If you want a second opinion on where your brand actually sits, that's exactly the kind of thing we help ecommerce brands work through. See our paid ads service or book a consultation.