Strategy + Playbooks
Estimate your Total Addressable Market using company criteria, headcount ranges, and industry data. Size the opportunity before you build the campaign. Free Claude skill.
[tam-calc]The Problem
"How big is the opportunity?" It's the first question investors, board members, and leadership ask. It's also the question most sales teams can't answer with any precision. They either throw out a massive number from a Gartner report that means nothing, or they guess based on a LinkedIn search they did once.
Properly sizing a market requires combining multiple data sources — industry reports, company databases, your own customer data — and running the analysis for TAM (total addressable), SAM (serviceable addressable), and SOM (serviceable obtainable). That's hours of spreadsheet work that most teams skip in favor of "there's a lot of companies out there."
The problem isn't just accuracy — it's decision-making. Without a real TAM analysis, you can't prioritize segments, allocate resources, or know when a market is saturated. You're running campaigns blind.
What It Does
TAM Calculator estimates your Total Addressable Market by combining your ICP criteria with market intelligence. It produces a three-tier analysis — TAM, SAM, and SOM — with company counts, revenue projections, and segment breakdowns. The output is structured for board decks, investor conversations, and campaign planning.
Every output includes:
This skill works best with a GTM playbook in your project for context. No playbook yet? Install GTM Playbook first.
Example
[tam-calc] Calculate TAM for a sales engagement platform targeting B2B SaaS companies with 50-2000 employees in North America. ACV is $24,000.All B2B SaaS companies with 50-2,000 employees in North America
B2B SaaS companies with 50-2,000 employees, using a CRM but no dedicated engagement platform, with an outbound sales motion
Companies in SAM actively hiring SDRs or showing buying signals, reachable through current channels, in Year 1
| Segment | Companies | Revenue Opportunity |
|---|---|---|
| 50-200 employees | ~4,200 | $100.8M |
| 201-500 employees | ~2,500 | $60M |
| 501-2,000 employees | ~1,700 | $40.8M |
Sizing method: Top-down + bottom-up validation
Data basis: Industry estimates + ICP criteria
Confidence level: Moderate (±25% on company counts)
Time to generate: ~10 seconds
Get Started
Open Claude Projects
Go to claude.ai and open your Projects section. Create a new project or use an existing one.
Add the skill instructions
Paste the skill prompt into your Project instructions. This teaches Claude the skill.
Start using it
Type `[tam-calc]` followed by your target market criteria — industry, company size, geography, and pricing. The skill calculates TAM, SAM, and SOM with segment breakdowns.
Use Cases
Before building a campaign for a new vertical or geography, run the numbers. Know whether there are 500 or 50,000 potential customers before investing in targeting and content.
Generate TAM/SAM/SOM slides with structured data instead of vague market references. The three-tier breakdown is exactly what investors expect to see.
Run TAM calculations for multiple verticals side-by-side. Use the comparison to decide where to focus first based on opportunity size and competition density.
Model different ACVs against your TAM to understand how pricing affects total market opportunity. Useful for pricing strategy decisions and packaging.
Work backwards from SOM to set pipeline and revenue targets your team can actually hit. No more arbitrary quota assignments disconnected from market reality.
Skill Stack
Define your ICP criteria first, then calculate how many companies match those criteria.
The playbook provides the market context and vertical definitions TAM Calculator uses.
After sizing your TAM, segment it into territories for prioritized outreach.
Use TAM insights to prioritize which segments to target first based on opportunity size.
ClaudeGTM includes every skill, video walkthroughs, templates, and a complete GTM system in a box.
Get ClaudeGTM — $297