Understanding Unit Economics
Unit economics are the direct revenues and costs associated with a particular business model, expressed on a per-unit basis. A "unit" might be a single customer (in SaaS) or a physical item sold (in E-commerce).
Contribution Margin vs. Gross Margin
Founders often confuse these two, but in the current environment, investors look closely at the distinction:
- Gross Margin: Revenue minus COGS (the cost of the product itself).
- Contribution Margin: Gross Margin minus all other variable costs (shipping, credit card fees, direct ad spend). This tells you how much money is left to cover fixed overhead like rent and payroll.
The Importance of "Breakeven Units"
This calculator shows the number of units you must sell monthly just to reach $0 net profit. If your contribution margin is low, you need massive volume to survive — a red flag for scalability.
SaaS Benchmarks
Top-performing SaaS companies often operate with 70–80% contribution margins, depending on GTM model and scale. Below 40% often means you're running a "services" business disguised as software.