Field note
Unit Economics for Small Businesses
Use per-customer revenue, variable cost, and contribution to test whether a product or service can scale.
The useful distinction
Unit economics turns a whole business into a repeatable unit: one order, client, subscription, or project. Compare revenue per unit with variable cost to see the contribution available for acquisition and overhead.
A simple working method
Document what the unit includes and use observed averages. For services, include delivery time and contractor cost. For subscriptions, monitor retention and the payback period alongside margin.
Worked example
A subscription collects 50 per month and incurs 12 of service and payment cost, leaving 38 of monthly contribution before acquisition and overhead. If acquisition costs 114, the simple contribution payback is three months, before churn effects.
Common mistakes
- Choosing a unit that hides costly exceptions
- Using averages without checking the spread
- Comparing acquisition cost with revenue instead of contribution
When this number can mislead
Averages can hide cohorts with different retention or service effort. Track the definition, observation window and variable-cost scope, then compare like with like before concluding that growth will improve economics.
Frequently asked questions
What should the unit be?
Choose the repeatable item that drives the decision: an order, client, project, seat or subscription period.
Should customer acquisition cost be in unit economics?
Include it when the question is payback or growth; keep it separate from direct delivery cost so contribution logic remains visible.
What if customers have different economics?
Use cohorts or segments when retention, service effort, price or channel cost varies materially between customers.
Decision checklist
- Define one repeatable unit.
- Measure revenue and variable cost on the same basis.
- Compare cohorts before assuming scale improves results.
Definition and formula context: Shopify product pricing help.
Write down the period, costs included, and whether figures are before or after discounts. Clarity makes a calculation reusable.
Use the profit margin calculator → · Review methodology and sources