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Discount Impact On Profit Calculator

Work out discount impact on profit instantly with clear inputs, formula shown and shareable results.

About Discount Impact On Profit Calculator

A discount comes straight off contribution, so the volume uplift required to hold profit flat is far larger than the discount itself. On a 36% margin a 10% discount needs roughly 38% more units — the arithmetic most promotional plans skip.

Formulas

Break-even volume

Volume needed = Current volume x Original contribution / Discounted contribution

Discounted contribution

CM after = List x (1 - Discount %) - Variable cost

Worked example

With the default values below, Discount Impact On Profit Calculator returns Volume uplift needed to stand still of 38.46%. Change any input above and every figure here is recalculated in your browser.

Inputs used

List price
50
Variable cost per unit
32
Discount offered
10
Current volume
2,000

Results

Volume uplift needed to stand still
38.46%
Units needed at the discount
2,770
Gross margin after discount
28.89%
Contribution lost per unit
$5.00

Step by step

  1. 1Values used
  2. 2Break-even volume
  3. 3Discounted contribution
  4. 4Volume uplift needed to stand still= 38.46
  5. 5Units needed at the discount= 2,770
  6. 6Gross margin after discount= 28.89
  7. 7Contribution lost per unit= 5.00

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why is the required uplift so large?

Because the discount is a percentage of price but the loss is a percentage of the much smaller contribution figure. Thin margins amplify this dramatically.

Does a discount ever pay?

Yes, when it unlocks genuinely incremental volume, clears ageing stock whose holding cost is real, or wins a customer whose lifetime value exceeds the giveaway.

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