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Unit Economics Calculator

The Unit Economics Calculator measures the profit contribution generated by one unit and estimates how many units are needed to recover fixed costs. It works for products, subscriptions, deliveries, or service transactions as long as revenue and variable costs are stated on the same per-unit basis.

The result highlights contribution margin, margin percentage, customer-level contribution after acquisition cost, and break-even volume. These metrics help test pricing and cost assumptions before a broader forecast is built.

Enter your values

USD
USD
USD
units
USD
Result
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contribution margin per unit
Contribution margin rate—
Contribution per customer after CAC—
Break-even units—
Break-even customers—

1. Enter unit revenue
Use the net revenue recognized for one product or transaction.

2. Add variable cost
Include costs that rise directly with each additional unit.

3. Describe acquisition economics
Enter acquisition cost per customer and average units purchased per customer.

4. Add period fixed costs
Use the overhead amount the contribution must recover.

5. Review viability
Positive unit and customer contribution are required for finite break-even volume.

Contribution per unit = Revenue per unit − Variable cost per unit; Customer contribution after CAC = Contribution per unit × Units per customer − CAC; Break-even units = Fixed costs ÷ Contribution per unit

Where:

  • CAC — customer acquisition cost
  • Variable cost — cost that changes with unit volume
  • Fixed costs — period costs not directly tied to each unit

Assumptions: Break-even results round up to whole units or customers and assume price and cost stay constant.

What the result means

The model is positive at both unit and customer levels, but actual break-even timing depends on sales volume and cash collection.

Results are estimates based on the values and assumptions entered.

Given:
$85 revenue per unit, $38 variable cost, $24 CAC, 3 units per customer, and $42,000 fixed costs

Calculation:
Unit contribution = 85−38 = $47. Customer contribution = 47×3−24 = $117. Break-even units = 42,000÷47 = 893.62, rounded up.

Result:
Contribution margin = $47 per unit; break-even volume = 894 units or 359 customers.

Interpretation:
The model is positive at both unit and customer levels, but actual break-even timing depends on sales volume and cash collection.

Which costs are variable?

Include costs that increase when one more unit is sold, such as product cost, transaction fees, or per-order fulfillment.

Should CAC be treated as a per-unit cost?

Not when one acquired customer buys several units. The customer-level calculation allocates CAC against the customer’s total contribution.

What if contribution margin is negative?

Selling more units increases the loss under the current assumptions, so break-even volume is not achievable without changing price or cost.

Does break-even include taxes and financing?

Only if they are included in the entered variable or fixed costs. The calculator does not add them automatically.

How is this different from contribution margin alone?

Contribution margin focuses on a unit or sales amount; unit economics extends the view to acquisition cost and customer purchasing behavior.