How to use this calculator
Enter original price, variable cost, volume, proposed discount, and a plausible new volume.
Formula and method
Contribution = (unit price − variable unit cost) × units. Required new units = ceil(original contribution/discounted unit contribution), when positive.
Worked example
Price 100, cost 60, 100 units and a 10% discount reduce unit contribution to 30; 134 units preserve at least 4,000.
Assumptions and supported scope
Single product and unchanged unit cost/fixed costs; no demand elasticity forecast. At non-positive discounted contribution, no finite preservation target is shown.
Method references
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