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fin.unit-economics Calculator
Calculates contribution margin per unit, CM ratio, and net contribution after fixed cost allocation from price and cost data. Contribution margin must be positive before fixed costs — a negative CM means each additional unit sold increases the loss.
Inputs
Avg Revenue
Total income generated before any costs are deducted. Profitability depends on how much survives after expenses.
Cogs Unit
Reference formula or conversion factor shown for context.
Shipping
Reference formula or conversion factor shown for context.
Return Rate
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Results
contribution margin per unit
Sample size or count used in the calculation.
net contribution (after returns)
Sample size or count used in the calculation.
CM ratio
The proportional relationship between two quantities.
effective COGS incl. returns
Sample size or count used in the calculation.
gross margin
Gross profit as a percentage of revenue. Tells you how much of each dollar of sales remains after production costs. Higher gross margin gives more room to cover fixed costs.
break-even units per month (if FC=$10k)
The price, quantity, or time at which total revenue equals total cost — neither profit nor loss.