The real answer isn't a percentage. It's a formula based on your goals, margins, and growth stage. Here's how to calculate your ideal ad budget.

From a client campaign shoot. The budget question, visualised.
You've probably heard: "Spend 5-10% of revenue on marketing."
This advice is useless. Here's why:
Industry benchmarks ignore:
Instead of arbitrary percentages, use this approach:
Formula: Target CAC = Customer Lifetime Value × 0.25-0.33
If your average customer is worth $3,000 over their lifetime, you can afford to spend $750-$1,000 to acquire them profitably.
Monthly Revenue Goal ÷ Average Transaction Value = Customers Needed
Example: $50,000/month goal ÷ $2,500 average = 20 customers needed
Customers Needed × Target CAC = Monthly Ad Budget
20 customers × $800 CAC = $16,000/month ad budget
Match your budget to your stage.
| Stage | Revenue | Ad Budget | Focus | Priority |
|---|---|---|---|---|
| Startup | < $500K revenue | $1-3K/mo | Proving product-market fit | Learning over scaling |
| Growth | $500K-$2M revenue | $5-15K/mo | Systems are proven, time to scale | Optimizing CAC |
| Scale | $2M+ revenue | $15-50K+/mo | Maximize proven channels | Brand + Performance |
Not all channels perform equally. Here's what to expect:
| Channel | Avg. CPM | Avg. CPC | Target CAC |
|---|---|---|---|
| Meta Ads. Creating demand, retargeting | $8-$15 | $0.50-$2.00 | $50-$300 |
| Google Ads. Capturing high intent | N/A | $2.00-$10.00 | $75-$400 |
| LinkedIn Ads. B2B, high LTV services | $30-$80 | $5.00-$15.00 | $250-$1000+ |
Benchmarks for service-based businesses in 2025. E-commerce costs will vary.
Don't advertise if you can't spend at least $1,500/month per channel.
Here's why:
Better to focus on one channel with adequate budget than spread thin across three.
Advertising accelerates what's already working. It doesn't fix broken fundamentals.
Don't run ads if:
When we work with clients, we start with this conversation:
What's your revenue goal for the next 12 months?
What's your average customer value?
What are you willing to spend to acquire a customer?
From there, we reverse-engineer the budget needed to hit their goals, and we're transparent about whether it's realistic.
Estimate your ideal monthly ad spend based on your revenue goals and customer value.
Inputs:
Outputs:
This is an estimate. Actual spend depends on platform and creative performance.
Stop guessing and start calculating. Book a strategy call and we'll help you determine the right ad budget for your specific business and goals.
Founder of donebyverde, a studio in South Florida. We build the site, shoot the content, and wire the follow up that answers first, for service businesses across South Florida. This article is how we actually work.
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