These two roles get confused all the time. Same level of seniority, similar price point, both part-time, both senior operators. But the scope is genuinely different, and picking the wrong one wastes 6-12 months. Here's how to decide.
Fractional CMO is broader — owns all of marketing including strategy, brand, demand gen, content, team leadership. Fractional head of growth is narrower and deeper — owns growth specifically: acquisition, activation, retention, and experimentation. Pick CMO if your bottleneck is 'we don't have a clear marketing strategy.' Pick head of growth if your bottleneck is 'we have a strategy but our acquisition channels aren't working.' Some companies eventually need both.
Fractional CMO scope: positioning, ICP definition, brand strategy, demand generation, content strategy, PR, marketing team hiring and structure, board credibility, cross-functional alignment with sales/product/finance. Senior-most marketing role.
Fractional head of growth scope: acquisition channel architecture (paid, organic, partnerships, community), activation and onboarding optimization (especially for PLG), retention and expansion programs, experimentation infrastructure, growth team hiring, growth analytics and dashboards. Senior-most growth role.
Overlap: both work on demand generation. Both work on conversion. Both work cross-functionally. But the CMO is responsible for what the company sounds like in the market; the head of growth is responsible for the mechanics that turn awareness into revenue.
Five signals you need a CMO, not a head of growth:
1. Your positioning isn't clear and your team can't articulate what you do
2. Your brand presence is weak relative to your category
3. Your marketing team needs leadership and direction, not more channel optimization
4. Your board wants someone in the room who owns marketing outcomes
5. Your strategy needs to evolve and you don't have an internal marketing voice
Five signals you need a head of growth, not a CMO:
1. Your positioning and strategy are clear, but your acquisition channels aren't producing
2. You have product-market fit but growth has plateaued
3. Your CAC has crept up and you can't figure out why
4. You need experimentation velocity and your current team doesn't have the framework
5. You're PLG and your activation/retention metrics need senior attention
Companies between $5M and $20M ARR often need both — and one fractional operator usually can't do both well. The pattern that works:
• Fractional CMO at 1-2 days/week owning strategy, brand, marketing team leadership
• Fractional head of growth at 1-2 days/week owning acquisition mechanics, experimentation, channel optimization
• Combined cost: $20K-$35K/month. Compare to full-time CMO + full-time head of growth at $50K-$80K/month all-in.
Less common but real: a single senior operator who can credibly do both. Usually only works at the smaller end of the scale (under $5M ARR).
Both roles run roughly $8K-$25K/month for 1-2 days/week of senior time. Variance comes from scope, stage, and experience.
Full-time equivalents:
• Full-time CMO: $300K-$500K all-in
• Full-time VP/Head of Growth: $300K-$450K all-in
Fractional pricing is 30-50% of full-time for the same seniority. The trade-off is part-time hours and shorter engagement length.
Two questions:
1. Is your bottleneck strategy or execution? Strategy bottleneck = CMO. Execution bottleneck = head of growth.
2. What's your single biggest gap right now? 'We don't know what to say' = CMO. 'We say it fine but it's not converting' = head of growth.
If both feel true, start with the CMO — strategy without execution can be patched short-term; execution without strategy compounds in the wrong direction.
| Dimension | Fractional CMO | Fractional Head of Growth |
|---|---|---|
| Primary focus | All of marketing | Growth function specifically |
| Strategy ownership | Yes — broad | Yes — narrower |
| Brand and positioning | Yes | Sometimes (lighter) |
| Acquisition channels | High level | Deep operational |
| Experimentation | Sometimes | Always |
| Team leadership | Marketing team | Growth team specifically |
| Board credibility | Yes | Usually yes |
| Best for | $5M-$50M ARR with strategy gaps | $1M-$20M ARR with channel gaps |
| Monthly cost | $8K-$25K | $8K-$20K |