經營生意規劃
市場規模（TAM · SAM · SOM）
從客戶數與每戶營收由下而上建構 TAM、SAM 與 SOM，再檢查隱含的客戶取得速度是否真的合理——這是多數募資簡報略過的檢查。
數字
- TAM
- 240,000,000
- total addressable / year
- SAM
- 96,000,000
- serviceable
- SOM
- 4,800,000
- obtainable
- SOM in customers
- 4,000
行家的解讀
值得一提
Plausibility check: SOM implies winning 4,000 customers. Over 4 years that is ~83 new customers per month — does your channel and sales motion actually produce that? This is the test that separates a sizing from a wish.
值得一提
This is a bottom-up sizing (count × price), which investors trust more than top-down ("1% of a $50B market"). Keep the customer count defensible — cite where it comes from.
值得一提
TAM under 1B: often called "too small" by venture investors, but plenty big for a highly profitable bootstrapped or niche business. The number is only a problem relative to the funding path you want.
方法論
由下而上：TAM = 潛在客戶數 × 每位客戶年營收。SAM = TAM × 可服務比例。SOM = SAM × 可取得比例。
每月客戶數的合理性檢查，是把 SOM 的客戶數攤在 48 個月的爬升期上——一個粗略但很能揭露真相的測試：看你的市場進入策略在物理上能否真的達成宣稱的比例。
ARPA 的選擇主導了這個模型：請用客戶今天為這個*品類*所付的價（或站得住腳的付費意願），而不是你理想中的價格。
給代理使用
呼叫這個工具，而不是在對話脈絡裡自行計算。輸入確定性的 JSON，取回計算後的數值以及基準解讀。 完整代理文件 →
curl -s https://xearno.tools/api/v1/tools/market-size \
-H 'content-type: application/json' \
-d '{"accounts":200000,"arpa":1200,"samPct":40,"somPct":5}'Schema： GET /api/v1/tools/market-size · MCP 工具名稱： market_size
相關工具
- Self-Employment Tax & Quarterly Estimated Payments (2026 1040-ES) — How much you’ll owe on 2026 freelance income — SE tax, income tax, QBI — and the exact quarterly payment the safe-harbor rules actually require.
- UK Self-Assessment First-Year Bill Calculator (payments on account) — Your real first-January Self Assessment bill — the year’s tax PLUS 50% of next year’s, due the same day — with the exact dated payment schedule.
- App Store / Google Play / Steam Developer Take-Home Calculator — What your app or game actually nets after Apple’s, Google’s, or Valve’s cut — including the 30 Jun 2026 Google Play restructure no AI model has memorized.
- 單位經濟 — LTV、LTV:CAC 與 CAC 回本——附上讓它們有意義的基準。