Promotional Price and Contribution Calculator

A discount lowers the price, but unit cost stays the same, so profit falls by more than the discount suggests. This tool shows the effect on contribution and how much sales must grow.

Formulas

• Campaign price = list × (1 − discount ÷ 100)
• Unit contribution = price − unit cost (old: list − cost)
• Change in unit contribution = new unit contribution − old unit contribution
• Margin (%) = contribution ÷ price × 100 (0 if the price is 0)
• Maximum discount (%) = (list − cost) ÷ list × 100; beyond it you lose money per unit
• Units needed = old contribution × units ÷ new unit contribution (rounded up); 0 if the new unit contribution is 0 or negative

Amounts are rounded HALF_UP to 2 decimals; margins use unrounded values.

Example 1: cost 60, list 100 TRY, 20% off, 5 units: campaign price 80.00 TRY; contribution falls from 40.00 to 20.00 TRY (change −20.00 TRY); margin from 40% to 25%; total campaign contribution 100.00 TRY; maximum discount 40%. To earn the same total contribution (200 TRY) you must sell 10 units, i.e. double.

Example 2 — a discount below cost: cost 90, list 100 TRY, 20% off: campaign price 80.00 TRY, new unit contribution −10.00 TRY, new margin −12.50%, maximum discount 10%; units needed shows 0, meaning the target cannot be reached.

Example 3: cost 33.33, list 49.99 TRY, 15% off, 7 units: campaign price 42.49 TRY, new unit contribution 9.16 TRY, margin 21.56%, total contribution 64.13 TRY, units needed 13.

How to read the result: the change in unit contribution shows how much profit each sale loses to the discount. The maximum discount rate is the limit at which unit contribution reaches zero; your campaign rate should stay below it. Units needed is the sales level required to match the original total contribution. If the new unit contribution is zero or negative it shows 0 and the target cannot be reached.