Ecommerce Marketing Budget: How Much Should You Spend?
The most common answer you'll find online is "spend 5–20% of revenue on marketing." Which is technically true and completely useless at the same time.
If you're running a $10M ecommerce brand, the real question isn't what percentage is normal. It's: how much can I spend and still make money? And the answer depends on four things that most articles don't talk about — your margins, your category, where you are in your growth journey, and how much demand you're already generating without paid media.
Let's actually answer it properly.
First, understand what marketing spend actually is
Marketing spend as a percentage of revenue (also called your MER — Marketing Efficiency Ratio — expressed as spend ÷ revenue, or its inverse, revenue ÷ spend) is a blended measure of how hard your marketing dollars are working across your whole business.
It's a useful health check. But it's a lagging indicator, not a target. You don't set a budget by picking a percentage. You set a budget by understanding what your business can absorb and still grow profitably.
The right marketing budget is the one that grows contribution margin, not just revenue.
Your gross margin sets the ceiling
Before you think about how much to spend, you need to know how much you have to spend. And that starts with your contribution margin — what's left after you subtract the cost of your product and your variable fulfilment costs (shipping, 3PL, returns) from your revenue.
This is your marketing budget envelope. If your contribution margin is 35%, you can afford to spend a very different amount than a brand running at 60%.
Gross margin sets the ceiling
| Gross margin range | Typical marketing spend | What it means |
|---|---|---|
| Under 40% | 5–8% of revenue | Thin margins, every dollar needs to work hard. Not much room for brand investment. |
| 40–55% | 8–15% of revenue | Moderate headroom. Mix of brand and performance is viable. |
| 55–70%+ | 12–20%+ of revenue | Healthy margins allow for brand investment and longer payback windows. |
If your gross margin is 35% and you're spending 20% on marketing, you're burning through contribution margin fast. The maths just doesn't work long term.
Low margin brands that overspend on marketing don't grow — they bleed. Get the margin right first, then scale spend.
High marketing spend is often a sign of low organic demand
Here's something most brands don't want to hear: if you're spending 20%+ of revenue on marketing and it still feels hard, that's not a media buying problem. That's a brand problem.
Brands with strong organic demand — through word of mouth, community, search intent, or repeat purchase — naturally run at lower marketing percentages. They don't need to buy every customer because customers are already looking for them.
The brands that need to hammer paid media to survive are usually fighting one of these battles:
Weak product differentiation — they look like everything else in the category
Low repeat purchase — every customer is a one-time transaction
No earned media — no reviews, no UGC, no community driving organic growth
Category commoditisation — they're in a race to the bottom on price
If your marketing spend feels like a treadmill — you stop spending and revenue stops — that's the signal. It means your brand isn't compounding. And throwing more budget at performance channels won't fix that.
High spend can mask a broken growth model. The goal is to build a brand where marketing multiplies organic demand, not replaces it.
Your spend percentage should come down as you grow
This is the part that surprises a lot of founders. As you scale, your marketing as a percentage of revenue should decrease — not stay the same or (god forbid) increase.
Why? Because brand equity accumulates. Your organic search improves. Your retention base grows. Your word of mouth increases. Your cost to acquire a new customer starts being offset by the compounding value of your existing customer base.
If your marketing percentage isn't declining as you grow, one of three things is happening:
You're reinvesting deliberately to accelerate growth (fine, if it's working)
Your retention is broken and you're replacing churned customers with expensive new ones
You've hit diminishing returns in your channels and you're not seeing it yet
Spend benchmarks by stage
| Revenue stage | DTC brand | Retailer / reseller | What to watch |
|---|---|---|---|
| $1M–$5M | 12–20% | 5–10% | CAC is high. Focus on learning what works. |
| $5M–$15M | 10–15% | 4–8% | Efficiency should improve. Brand investment begins. |
| $15M–$30M | 8–13% | 3–7% | MER stabilising. LTV becoming a real lever. |
| $30M–$50M | 6–12% | 3–6% | Organic and retention carrying more weight. |
Resellers and multi-brand retailers typically run at lower percentages because they're riding category demand that already exists. They're not building a brand from scratch — they're capturing intent that others created.
DTC brands have to work harder because they're building both the brand and the demand simultaneously. The payoff is better margin and more pricing power if they do it right.
CAC matters just as much as the percentage
Your marketing spend as a percentage of revenue tells you how efficient your marketing is in aggregate. But your Customer Acquisition Cost (CAC) tells you whether you can actually afford to keep growing.
The number to care about isn't CAC in isolation — it's your LTV:CAC ratio and your payback period. How long does it take to recoup what you spent to acquire a customer? And how much do they spend with you over time relative to what you paid to get them?
CAC health check
| Metric | Healthy | Warning sign |
|---|---|---|
| LTV:CAC ratio | 3:1 or higher | Below 2:1 — not making enough back per customer |
| CAC payback period | Under 6 months | Over 12 months — cash flow risk on inventory-heavy businesses |
| New customer % of revenue | 30–50% | Over 70% — you're not retaining anyone |
| Repeat purchase rate (yr 1) | 25–40% | Under 20% — one-and-done buying behaviour |
If your CAC is high and your payback period is long, scaling spend is a working capital trap. You're fronting the cost of customers before you've recovered it. That's manageable with the right inventory and cash position, but it becomes a real problem fast if you run out of runway.
A rising CAC is one of the earliest signals that your marketing efficiency is deteriorating — usually before it shows up in your MER.
Category competitiveness changes everything
Not all categories are equal. Some are dominated by a handful of well-funded incumbents who have been buying market share for years. Others are more fragmented and accessible. The competitiveness of your category directly affects how much you need to spend to be visible.
In highly competitive categories — think supplements, activewear, beauty, home goods — CPMs are higher, everyone is running similar offers, and it takes more to cut through. In those environments, creative quality and brand differentiation become the variable, not budget.
In less competitive categories, or where you have genuine product differentiation, you can often outperform on a fraction of a competitor's budget because your conversion rates are naturally higher.
Category competitiveness
| Category type | What it means for spend |
|---|---|
| High competition beauty, supplements, activewear | Higher CPMs. Brand investment is critical. Creative quality is your edge — not budget. |
| Mid competition homewares, pet, outdoor | Moderate CPMs. Efficient if your product has clear differentiation. |
| Lower competition / niche | Cheaper acquisition, but smaller market. Efficiency comes from category leadership. |
| Seasonal / event-driven | MER looks great in peak, hides off-season problems. Watch the annual blended number. |
The mistake founders make is comparing their spend percentage to brands in completely different categories. A 12% spend rate in activewear and a 12% spend rate in a niche B2B adjacent category are two completely different situations.
So what should you actually spend?
Here's the honest answer: start with what your contribution margin allows, not what a benchmark says.
Work through this in order:
How to set your budget
| Step | Question to answer |
|---|---|
| 1. Gross margin check | What does my contribution margin look like after COGS and fulfilment? This is your ceiling. |
| 2. CAC reality check | What am I actually paying to acquire a customer, and how long until I recoup it? |
| 3. Organic demand audit | How much revenue comes without paid media? Email, organic search, direct, referral? |
| 4. Category read | How competitive is my category and what does it cost to be present? |
| 5. Growth stage | Am I investing to acquire or optimising for efficiency? Both are valid — not at the same time. |
If you're spending more than 15% of revenue on marketing and your contribution margin is under 45%, something needs to change — either the margin, the spend, or both.
And if the number feels uncomfortably high, that's worth paying attention to. High marketing spend that feels like survival rather than growth is usually telling you something about the underlying business — not the channel mix.
The bottom line
There's no magic number. But there is a range your business can afford, and that range is determined by your margins, your CAC, how much organic demand you've built, where you are in your growth journey, and how competitive your category is.
The brands that get this right aren't spending the most. They're spending what their unit economics allow, building brand equity so the spend compounds over time, and using marketing efficiency as a diagnostic tool — not just a budget line.
Get those foundations right and the percentage takes care of itself.
I work with ecommerce brands doing $5M–$50M as a fractional CMO — helping founders grow profitably without the overhead of a full-time hire. If this post resonated and you're trying to figure out whether your marketing spend is working as hard as it should be, I'd love to have a conversation.
