How to Use the Discount vs Volume Profit Calculator
When planning a discount promotion, the key question is whether the resulting sales boost will offset the lost margin per unit. This calculator computes total margin before the discount using price, cost, and current volume, then applies the discount rate and expected volume increase to compute total margin after the discount, comparing the two directly.
A bigger discount isn't automatically a loss. If the volume increase outpaces the discount rate, total margin can actually grow — and higher-margin products tend to benefit even more from the resulting volume boost. Conversely, low-margin products can require a very large volume increase just to break even on a small discount.
The expected volume increase is best estimated from your own past promotion data. Without that, reference price-elasticity figures for a similar category, or use a conservative, lower estimate to reduce risk.
Frequently Asked Questions
Not necessarily. If the resulting volume increase is larger than the discount rate itself, total margin can actually grow. Higher-margin products tend to benefit more from a volume boost after discounting.
If you have past promotion data, referencing how volume changed relative to discount depth is the most accurate approach. Without data, reference price-elasticity figures for a similar category or use a conservative, lower estimate.