Unit Economics
What is Unit Economics?
Unit economics measures the profitability of a single customer or transaction. At its simplest: how much revenue does one customer generate (Customer Lifetime Value) minus what you paid to acquire them (Customer Acquisition Cost). If your CAC is 100 and CLV is 300, your unit economics are solid. If CAC is 100 and CLV is 80, your business model is broken.
Why It Matters
Unit economics are the foundation of any sustainable business. You can grow fast and look impressive to investors, but if your unit economics are negative, you're just efficiently destroying cash. For bootstrapped founders especially, profitable unit economics are non-negotiable—you can't survive on venture funding. Understanding unit economics forces you to make real decisions: raise prices, reduce acquisition costs, increase customer lifetime value, or kill the business.
How to Apply
Calculate your CAC by taking total marketing and sales spend and dividing by new customers acquired. Calculate CLV by taking annual revenue per customer and multiplying by expected customer lifespan (or simply gross profit per customer times years kept). Aim for a 3:1 or 4:1 ratio of CLV to CAC. Then benchmark your unit economics against your payback period—if you spend 100 to acquire a customer and they generate 300 lifetime value, how long until you recover that 100? 3-6 months is healthy for SaaS. Track unit economics by customer segment, acquisition channel, and product—different segments have wildly different economics. IdeaFuel's Financial Modeling tool helps you model unit economics across different customer segments, pricing strategies, and acquisition channels to identify your most profitable growth levers.
Common Mistakes
- Ignoring CAC entirely—many founders focus only on revenue and ignore what customers cost to acquire. You can't build a sustainable business on broken unit economics.
- Including overhead in CAC calculation—CAC should be direct marketing and sales spend per customer, not fully loaded. Overhead is a separate problem.
- Assuming unit economics stay constant as you scale—CAC usually increases and conversion rates decline as you exhaust your easy-to-reach customers. Model this explicitly.
How IdeaFuel Helps
IdeaFuel's Financial Modeling tool helps you model unit economics across customer segments and acquisition channels, identifying your most profitable growth strategies.