Unit Economics
The direct revenues and costs associated with a single unit of your business model — typically one customer. The fundamental analysis of whether your business makes money at the individual customer level.
Unit Economics Is the Business Model Stress Test
Revenue growth looks great in pitch decks. Unit economics tells you whether that growth is building a business or digging a hole. If it costs you $15K to acquire a customer who generates $10K in lifetime value, every new customer makes your company worth less. Growth just accelerates the bleeding.
The Core Framework
Three numbers define your unit economics:
- CAC — What it costs to acquire one customer
- LTV — What one customer is worth over their lifetime
- LTV:CAC — The ratio between the two
If LTV:CAC is above 3:1 and payback period is under 18 months, your unit economics work. Everything else is optimization.
Common Unit Economics Traps
The most common trap is calculating LTV on revenue instead of gross margin. The second most common trap is using blended CAC when channel-specific CAC tells a very different story. The third trap is ignoring expansion and contraction in LTV calculations. Fix all three and your unit economics picture changes dramatically — usually not for the better.
Unit Economics at Scale
Unit economics should improve as you scale, not degrade. Brand awareness reduces CAC. Product maturity reduces churn. Expansion motion increases LTV. If your unit economics are worse at $10M ARR than they were at $2M ARR, your go-to-market is not scaling efficiently.
Frequently Asked Questions
What metrics make up unit economics?
The core trio is CAC (cost to acquire), LTV (lifetime value), and LTV:CAC ratio. Supporting metrics include payback period, gross margin, and ARPU. Together they tell you whether each customer is profitable, how long until they are profitable, and how much profit they generate over their lifetime.
When should a startup start tracking unit economics?
As soon as you have paying customers. Even with 20 customers, you can calculate basic CAC, ARPU, and early churn rates. Waiting until Series A to figure out your unit economics means you might have spent two years scaling something that loses money per customer. Start early, even if the data is imperfect.
