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Coupon Profit Impact Calculator

Enter your price, unit cost and coupon discount to see the profit impact.

Result

How it is calculated

You enter the full selling price, the cost of one unit (both in dollars) and the coupon discount as a percentage of the price. The tool takes the discount off the price and keeps the cost fixed: coupon price = price × (1 − discount ÷ 100), profit = coupon price − cost, margin = profit ÷ coupon price × 100. It also computes the margin at full price, (price − cost) ÷ price × 100, and shows margin lost as the difference in percentage points. Margin is measured on the selling price, not on cost. There is no result if the price is not above the cost, if the discount is 100% or more, or if any value is negative. If the coupon pushes the price below the cost, the profit and margin are shown as negative numbers.

Worked example

A product sells for $50 and costs $30 to make; a 20% coupon is offered. Price after the coupon: 50 × 0.80 = $40. Profit per sale: 40 − 30 = $10.00, down from $20 at full price. Margin with the coupon: 10 ÷ 40 × 100 = 25.00%. Margin at full price: 20 ÷ 50 × 100 = 40%, so 15.00 points of margin are lost. Since profit per sale halves, you would need to sell twice as many units with the coupon to earn the same total profit.

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Common mistakes

  • Treating margin lost as a percentage. It is in percentage points: going from 40% to 25% is 15 points, not a 15% drop. In relative terms the margin fell by 37.5%.
  • Thinking that a 20% discount costs only 20% of profit. The cost stays fixed, so the discount comes entirely out of profit, and here profit falls by half.
  • Entering the cost as a percentage or leaving shipping and payment fees out of it. A cost that is too low makes the coupon look safer than it is.
  • Comparing margin and markup. This tool gives margin on selling price; a 25% margin is the same as a 33% markup on cost.
  • Forgetting that a deeper coupon can pass below cost. At a 45% discount on this item the profit becomes −$2.50, so every sale loses money.

Sources

About this calculator

A coupon that looks generous to customers can quietly erode a business’s margin far more than the discount percentage suggests, because the discount comes straight off revenue while the unit cost stays fixed. A 20% coupon on a product with a 40% margin, for instance, can cut profit per sale by half.

This calculator shows the profit and margin per sale after a coupon is applied, alongside how many margin points are given up compared to selling at full price. It’s a practical check for small business owners and e-commerce sellers deciding how deep a promotional discount can go, and for marketers weighing a coupon campaign’s expected volume lift against its real cost to the bottom line.

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Comments (1)

  • Editorial team

    Percentage points can hide the real cost. At the default 15 percent coupon, margin drops from 60 to 52.94 percent, but profit per unit falls from 30.00 to 22.50, a quarter lower. To earn the same total profit you would need to sell one third more units. Does your coupon get used by buyers who would have bought anyway?

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