Unit Economics Formula
The Unit Economics Formula, specifically the Contribution Margin, reveals the profitability of each individual unit sold. It's crucial for understanding how much profit each sale generates to cover fixed costs and contribute to overall business profit.
Formula
Copy the exact expression or work through it step by step below.
Contribution Margin = Revenue Per Unit - Variable Cost Per Unit Variables
CM
Contribution Margin
The recurring amount that changes the unit economics result over time.
RU
Revenue Per Unit
The incoming amount used to size the unit economics outcome.
VCU
Variable Cost Per Unit
The cost-side input that anchors the unit economics math.
Step By Step
- 1
Set the baseline case with the real calculator inputs.
CAC = $150, Monthly Arpu = 49, Gross Margin Percent = 75.0%, Avg Lifespan Months = 24
- 2
Translate rates, periods, and cash values onto the same footing before combining them.
Keep the unit economics assumptions consistent instead of mixing monthly and annual views.
- 3
Apply the formula and read the first calculator outputs, not just the headline assumption.
The calculator lands with ltv at $882 and monthly contribution at $36.75.
- 4
Run one changed scenario so the formula is stress-tested before it is trusted.
The unit economics calculator page is the fastest way to compare that second case.
Worked Example
Unit Economics sample case
CAC
$150
Monthly Arpu
49
Gross Margin Percent
75.0%
Avg Lifespan Months
24
Contribution Margin = Revenue Per Unit - Variable Cost Per Unit using cac $150, monthly arpu 49, gross margin percent 75.0%, avg lifespan months 24.
The calculator lands with ltv at $882 and monthly contribution at $36.75.
Common Variations
Try These Tools
Run the numbers next
Sources & References
- Unit Economics — Investopedia
- Startup CEO: A Field Guide to Scaling Up Your Business — Wiley (Matt Blumberg)
Related Content
Keep the topic connected
Unit Economics Examples
Explore practical unit economics examples across SaaS, e-commerce, and services. Learn to calculate CLTV, contribution margin, and project profitability for smarter business decisions.
How to Use Unit Economics Calculator
Master your business's profitability per unit with this guide. Learn to calculate LTV, CAC, and gross margins to optimize growth and financial health.
What Is LTV? Simply Explained
Understand LTV (Customer Lifetime Value), a vital SaaS metric. Learn its calculation, why it's crucial for profitability, and how it informs strategic business decisions.