What unit economics measures
Unit economics tells you whether a single customer earns back more than it costs to win and keep. The unit is usually one customer or one account, and the model compares what that account pays over its life against what you spent to acquire and serve it. When the ratio is healthy, growth compounds. When it inverts, every new customer drains cash faster.Two inputs anchor the model. The first is customer acquisition cost, the fully loaded sales and marketing spend divided by new customers won. The second is customer lifetime value, the gross-margin revenue a customer contributes before they churn. The relationship between them decides whether your acquisition engine funds itself.
The core ratios
Revenue leaders track a small set of derived metrics rather than raw dollars.
| Metric | Question it answers |
|---|---|
| LTV to CAC ratio | Does a customer return several times their acquisition cost? |
| CAC payback period | How many months until a customer repays what you spent? |
| Contribution margin | What does one account earn after variable cost to serve? |
Why it governs spend
Unit economics sets the ceiling on how aggressively you can grow. If each customer pays back in six illustrative months, you can fund acquisition from existing accounts and scale hard. If payback stretches past two years, you are financing growth from the balance sheet and burning runway.
The lever most teams miss is retention. Extending customer life or lifting expansion revenue improves lifetime value without raising a dollar of acquisition spend, which is why churn work and unit economics belong in the same review.
Frequently Asked Questions
What is unit economics in SaaS?
Unit economics is the profit and loss of a single customer relationship. For a SaaS business it compares the gross-margin revenue a customer pays across their subscription against the cost to acquire and serve them. Healthy unit economics means each account funds the acquisition of the next one. Weak unit economics means growth burns cash and depends on outside funding.
How do you calculate unit economics?
Start with two numbers per customer. Divide fully loaded sales and marketing spend by new customers won to get acquisition cost, then multiply average monthly gross-margin revenue by expected customer lifespan to get lifetime value. Divide lifetime value by acquisition cost for the core ratio, and divide acquisition cost by monthly gross margin for payback period. Run the math on cohorts rather than a blended average so one large deal does not hide weak segments.
What counts as good unit economics?
A commonly cited practitioner convention treats a lifetime value to acquisition cost ratio around 3 to 1 as workable, with acquisition cost repaid inside twelve months. These figures are illustrative and shift with deal size and gross margin. A long payback can still work for enterprise contracts with low churn, while a fast payback matters more for lower-priced products sold at high velocity. Read the numbers against your own cohorts before setting a target.
Put these metrics to work
ORM builds custom revenue forecast models that turn concepts like unit economics into prescriptive action for your team.
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