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tam-calculator

Use this skill when you need a credible market size for a B2B product: a board or investor deck, territory planning, deciding which segment to attack, or checking whether outbound has enough accounts to sustain a quota. Builds a bottom-up TAM, SAM and SOM from countable accounts and real prices instead of top-down analyst numbers, shows every assumption, and turns the result into an account count per segment that sales can actually work.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

prosyo-ai/gtm-skill스타 11(GitHub 11 + cccskills 0)

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포함된 파일(2)

  • SKILL.md4.0 KB
  • references/sizing-worked-example.md1.7 KB

SKILL.md(원문)

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Use this when someone asks "how big is the market?" or "do we have enough accounts?". It produces a bottom-up size that survives questions, because every number traces to a count or a price.

Inputs

  • ICP and the segments you sell to.
  • Pricing and the average first-year contract value per segment.
  • Account counts per segment from a company database, industry registry or association data. Estimates are acceptable if labelled.

The play

1. Count accounts, do not quote reports

Top-down numbers ("the sales software market is $X billion") cannot be worked and rarely survive diligence. Start from countable companies: headcount band × industry × region.

2. Define the three layers

  • TAM: every account that could use the product at full price, globally.
  • SAM: accounts you can serve today: regions, languages, integrations and segments you support.
  • SOM: accounts you can realistically win in 3 years given team size, win rates and sales capacity.

3. Price each segment

Accounts × annual contract value. Use real deal data per segment; a blended average hides that enterprise accounts are 10x the value and 3x the cycle length.

4. Pressure-test SOM with capacity

SOM must be reachable by the go-to-market you have or plan to fund. Capacity check: reps × accounts each can work per year × win rate. If capacity reaches 400 wins and SOM says 4,000, SOM is wrong. Read references/sizing-worked-example.md for the full table.

5. Check outbound coverage

Divide SAM accounts by the number of reps and by contacts touched per rep per quarter. If a team will exhaust its SAM in under 4 quarters, flag it: list fatigue is coming and the ICP needs widening or new channels.

Output format

Segment table: segment | accounts | ACV | TAM $ | in SAM? | SOM share | SOM $
Totals: TAM $X (N accounts) | SAM $Y (N) | SOM $Z (N) in 3 years
Assumptions: <each with source or "estimate">
Capacity check: <reps x accounts x win rate = wins/year>
Coverage: <quarters until SAM is fully touched at current volume>
Biggest uncertainty: <one line + how to reduce it>

What good looks like

  • Every number in the deck can be traced to a row in the assumption table.
  • SOM is constrained by capacity, not by ambition. "1% of a huge market" is the classic red flag investors look for.
  • Segments are separated, because the decision the sizing supports is usually "which segment first".
  • The best version ends with an account list size, not just a dollar figure, so sales can act on it.

Rules

  • MUST build bottom-up from account counts and prices.
  • MUST label every estimate as an estimate.
  • NEVER present a top-down analyst figure as your TAM without the bottom-up check.
  • NEVER let SOM exceed what the sales capacity check supports.

Example prompts

  • "Size the market for our payroll tool for restaurant groups in the US and UK."
  • "Build TAM, SAM and SOM for our seed deck, bottom-up, with every assumption shown."
  • "We have 6 SDRs. Do we have enough accounts in our SAM for the next two years?"

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