Discount Margin Calculator
On an item carrying twenty percent margin, ten points of discount wipes out half of it. Discounts are granted in price points and paid for in margin points, at a ratio intuition underestimates every time. The commercial conversation nonetheless keeps running in percentage of price, on a number that looks modest; the scale of the giveaway surfaces at the category review.
Two configurations widen the gap and are seldom computed. Stacked discounts compound rather than add: three lots of ten percent do not make thirty. And a discount placed on an already promotional price bites into margin that has already been reduced, which moves break-even volume far faster than the headline rate implies. Both cases are handled explicitly here.
Discount Margin Calculator
How to read the result
What you enter
- Shelf price and cost price of the item
- Discount considered, as a percentage or an amount
- Successive discounts, in the order they apply
- Starting price: list price or an already promotional price
How to read the result
- The extra volume required is the figure to test against commercial realism
- For a stack, the gap to the arithmetic sum is shown outright
- On an already promotional price, margin erodes faster than the headline rate suggests
- What the output supports: grant, cap, or refuse with the volume argument in hand
What the result does not tell you
- Break-even volume is an arithmetic threshold. The tool says neither whether it is reachable on this item, nor over what period.
- Cost price is assumed fixed. Extra volume that unlocks a supplier rebate tier or changes the logistics scheme improves the answer without being captured.
- Nothing is said about neighbouring items. A discount that pulls volume within the same shelf improves the line and damages the category.
- No memory effect is modelled. Repeated, a discount shifts the customer's reference price and makes the return to list price steadily more expensive.
The calculation holds at item level. Deciding a discount across a range means repeating the exercise at category level.
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