How to Use Unit Economics Calculator
The Unit Economics Calculator quantifies the revenue and costs associated with a single unit of your business (typically a customer or a product). By breaking down your financial performance to this granular level, it provides clear insights into the sustainability and scalability of your business model.
Bottom Line
Enter CAC, monthly ARPU, gross margin, and churn to get LTV, LTV-to-CAC ratio, payback period, and monthly contribution margin — the numbers that determine whether your unit economics support growth.
Unit Economics Calculator
Evaluate LTV:CAC ratio, payback period, and per-customer viability.
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What It Does
Use the calculator with intent
The Unit Economics Calculator quantifies the revenue and costs associated with a single unit of your business (typically a customer or a product). By breaking down your financial performance to this granular level, it provides clear insights into the sustainability and scalability of your business model.
Founders checking whether their LTV-to-CAC ratio is strong enough to raise a growth round, and marketers who want to verify that planned acquisition spend will actually produce positive-margin customers.
Interpreting Results
Start with LTV. Then compare Monthly Contribution and Unit Profit before deciding what changes the answer most.
Input Steps
Field by field
- 1
Enter inputs
Enter CAC, monthly ARPU, gross margin percent, average customer lifespan in months, and monthly churn percent. Lifespan and churn should broadly agree because 5% monthly churn implies about 20 months of expected life, while 2% implies about 50 months.
- 2
Read outputs
Read monthly contribution, LTV, LTV:CAC ratio, CAC payback months, unit profit, implied lifespan from churn, and the verdict. Below 1 is unsustainable, 1-3 is marginal, 3-5 is healthy, and above 5 is excellent but can also suggest under-investment in growth.
- 3
Take
Take warnings seriously when implied lifespan from churn differs from your entered lifespan by more than about 20%. That usually means your LTV is being flattered by optimistic assumptions rather than actual retention behavior.
- 4
Use result
Use the result to choose the highest-use fix: lower CAC, higher ARPU, better gross margin, or lower churn. If LTV:CAC is healthy but payback is still long, cash flow rather than profitability is the bottleneck and pricing or onboarding may matter more than top-line growth.
- 5
Re-run
Re-run every month by channel, plan tier, or segment. Track LTV:CAC and payback together because ratios can improve while capital efficiency still worsens if gross contribution takes too long to recover CAC.
Run one base case and one sensitivity case before trusting a single output.
Common Scenarios
Use realistic starting points
Baseline assumptions
CAC
150
Monthly ARPU
49
Gross Margin Percent
75%
Avg Lifespan Months
24
Check LTV-to-CAC ratio first — under 3x means the business is acquiring customers at a cost that won't compound, and fixing CAC or churn matters more than growing top-line revenue.
Higher CAC
CAC
180
Monthly ARPU
49
Gross Margin Percent
75%
Avg Lifespan Months
24
Higher CAC does not touch LTV but reduces the LTV:CAC ratio and lengthens payback. Watch the verdict label : if the ratio tips from healthy to marginal, it usually means CAC scaled faster than the business improved monetization. Payback extension is the more actionable number: each extra month of payback is a real cash-flow cost that compounds at scale.
Lower Monthly ARPU
CAC
150
Monthly ARPU
41.65
Gross Margin Percent
75%
Avg Lifespan Months
24
Lower ARPU shrinks monthly contribution and reduces LTV. Watch the implied lifespan from churn versus your entered lifespan : if ARPU is falling because customers are downgrading rather than churning, lifespan stays the same but LTV compresses, and the ratio can look worse than a simple churn problem would cause.
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