經營生意定價 · 規劃
單位經濟
從 ARPU、毛利率與流失率算出客戶終身價值；與取得成本比較；並對照標準的 SaaS／訂閱基準（3:1 的 LTV:CAC、回本低於 12 個月）解讀結果。
數字
- LTV : CAC
- 3.3 : 1
- Customer LTV (gross profit)
- 1,333
- CAC payback
- 10 months
- Implied customer lifetime
- 2.8 years
行家的解讀
好跡象
3.3:1 sits in the healthy 3–5:1 range for subscription businesses.
好跡象
Payback under 12 months — acquisition recycles cash quickly, which compounds growth without extra funding.
值得一提
Check your CAC definition: blended CAC (all customers ÷ all spend) flatters the number when organic is strong. Paid CAC is the honest test of whether paid channels work.
方法論
LTV =（ARPU × 毛利率）÷ 每月流失率。這是標準的毛利 LTV；以營收計的 LTV 會被毛利倍數高估。
CAC 回本 = CAC ÷ 每位客戶每月毛利——客戶還清其取得成本所需的月數。
基準（3:1 LTV:CAC、回本 <12 個月、B2B 每月流失 <2%）是廣泛使用的 SaaS 營運常態——當作門檻用，不是定律。以 1/流失率 估算終身，假設流失率固定，當早期流失高於成熟期流失時會高估終身。
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/unit-economics \
-H 'content-type: application/json' \
-d '{"arpu":50,"grossMargin":80,"churn":3,"cac":400}'Schema： GET /api/v1/tools/unit-economics · MCP 工具名稱： unit_economics
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