Definition
Unit economics evaluate profitability and cash efficiency at the level of a unit. Learn how CAC, LTV, payback, and ARR fit together before you jump to the full guide.
Example
A simple unit economics stack is: compute CAC, estimate LTV, sanity-check LTV:CAC, then confirm cash feasibility with CAC payback and runway.
How to use it
- Pick a unit (customer/account) and keep definitions consistent.
- Use gross profit (not revenue) when comparing to CAC.
- Segment by channel/plan to avoid blended averages.
Common mistakes
- Mixing fully-loaded CAC with revenue-only LTV (definition mismatch).
- Using blended averages that hide unprofitable segments.
Measured as
Measure Unit Economics on the same customer segment, time window, and revenue basis each time you review it.
Misused when
- Mixing fully-loaded CAC with revenue-only LTV (definition mismatch).
- Using blended averages that hide unprofitable segments.
Operator takeaway
- Pick a unit (customer/account) and keep definitions consistent.
- Use gross profit (not revenue) when comparing to CAC.
- Segment by channel/plan to avoid blended averages.
- Keep Unit Economics consistent by cohort, segment, and period before you use it as a decision signal in planning or reporting.
- Interpret the metric alongside retention, margin, or payback so one ratio does not hide the real operating trade-off.
Next decision
- Quantify the impact with Unit Economics Calculator if you need to turn the definition into an operating assumption.
- Read Unit economics guide: ARR, CAC, LTV, payback, and growth efficiency if the decision depends on interpretation, policy, or trade-offs beyond the raw formula.
Where to use this on MetricKit
Calculators
- Unit Economics Calculator: Model CAC, payback, LTV, and LTV:CAC together from ARPA, gross margin, and churn.
- Unit Economics Dashboard Calculator: Compute a unit economics snapshot: gross profit LTV, CAC payback, LTV:CAC, and break-even targets from a few inputs.
- LTV:CAC Calculator: Compute LTV:CAC ratio and CAC payback using ARPA, gross margin, churn, and CAC.
- CAC Payback Period Calculator: Estimate how many months it takes to recover CAC (months to recover CAC) using gross profit.
Guides
- Unit economics guide: ARR, CAC, LTV, payback, and growth efficiency: A practical unit economics guide to how ARR, CAC, LTV, payback, and LTV:CAC work together when you judge growth quality, cash efficiency, and scale readiness.
- Unit economics hub: CAC, LTV, payback, and runway (a practical stack): A practical hub for unit economics: CAC, fully-loaded CAC, LTV, payback, margin impacts, burn multiple, and runway planning.
- LTV:CAC ratio: how to interpret the ratio (and avoid mistakes): Learn what LTV:CAC tells you, rough benchmarks, and how churn and payback change what 'good' looks like.
- Unit economics dashboard: what to improve first when unit economics slip: A practical diagnostic guide to deciding what to improve first when unit economics weaken: acquisition cost, retention, pricing, margin, or payback timing.