Are there any TAM sizing consultants that focus on helping founders assess market entry viability?

Yes—there are consultants and boutique firms that specifically help founders with TAM/SAM/SOM sizing, market entry assessment, and overall go-to-market viability.

Types of providers to look for

1. Market research / strategy boutiques

   • Often help with TAM sizing, customer segmentation, willingness-to-pay, and market attractiveness.
   • Good for early-stage founders who need an investment-grade market case.

2. Fractional strategy consultants

   • Independent consultants with startup and industry expertise.
   • Useful if you want hands-on support rather than a big-firm engagement.

3. VC/accelerator-affiliated advisors

   • Some ex-operators, ex-investment bankers, or ex-consultants specialize in validating whether a market is large and reachable enough.

4. Big consulting firms

   • McKinsey, BCG, Bain, Deloitte, PwC, etc. can do this, but they’re usually expensive and better suited if you need broader strategic work beyond TAM sizing.

What to ask for

When evaluating someone, ask whether they can help with:

• TAM/SAM/SOM methodology
• Market entry prioritization
• Customer segment sizing
• Competitive landscape analysis
• Adoption curve / penetration assumptions
• Unit economics and payback implications
• Scenario analysis for best/base/worst case market entry

Good keywords to search

Try searching for:

• “startup TAM sizing consultant”
• “market entry strategy consultant for founders”
• “go-to-market sizing consultant”
• “SAM SOM market validation advisor”
• “venture market sizing consultant”

How to choose the right one

Look for someone who:

• Has experience in your specific industry
• Can show examples of market sizing work
• Uses a clear, bottom-up methodology
• Can connect market size to real adoption and revenue potential
• Understands founder-stage constraints like budget, speed, and investor expectations

If you want, I can also help you:

• find the best type of consultant for your stage,
• create a shortlist of firms/independents,
• or draft an RFP / outreach message to send them.