LTV:CAC Ratio
The health ratio every investor checks first
Comparing how much profit a customer brings in versus what it cost to acquire them (3:1 means ₹3 earned for every ₹1 spent).
Why It Is Critical
This is the single ratio that leadership and investors check first - above almost everything else. It tells you whether the business model is fundamentally sound: are you acquiring customers for significantly less than what they are worth? A healthy LTV:CAC ratio is the foundation on which every growth decision is built.
How It Works & Underlying Dynamics
A ratio of 3:1 is the widely used industry benchmark - meaning every ₹1 spent acquiring a customer returns ₹3 in margin-adjusted lifetime value. But this benchmark is a heuristic, not a law. An early-stage company deliberately buying market share may rationally run at 1.5:1. A mature SaaS business with very low churn may comfortably run at 5:1 or higher.
Strategic Rules of Thumb & Execution Playbook
- Recalculate monthly using margin-adjusted LTV - not revenue LTV.
- Treat a ratio trending below 2:1 as a signal requiring immediate action - better targeting, retention work, or pricing review.
- A ratio improving from 2:1 to 3:1 over six months is a stronger signal than a static 3:1.
- Always ask: which version of LTV is underneath this ratio before reacting to it.
Calculation Example & Benchmark Matrix
| LTV:CAC Range | What It Signals |
|---|---|
| Below 1:1 | Losing money on every customer acquired |
| 1:1 - 2:1 | Danger zone - margins are too thin or CAC too high |
| 3:1 | Widely used healthy benchmark |
| 5:1+ | Excellent - or possibly under-investing in growth |
'A 6:1 ratio built on revenue LTV and a 2:1 ratio built on margin LTV might describe the exact same business. Always ask which version of LTV is underneath the ratio before treating it as good news.'