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Discount Impact Calculator

See how much extra volume a discount must generate simply to hold gross profit flat.

About Discount Impact Calculator

A discount comes entirely out of contribution, not revenue, so a 20% discount on a 55% margin removes over a third of the profit per unit. Holding profit flat then requires a far larger volume increase than the discount itself. The required volume uplift is almost always larger than anyone expects, which is why discounting is the fastest way to grow revenue and shrink profit at the same time.

Formula

Discount Impact

Units needed = original gross profit ÷ contribution per unit after the discount

contribution
Price less unit cost, the profit each sale delivers

Worked example

With the default values below, Discount Impact Calculator returns Extra Volume Needed to Hold Profit of 57.20%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Full price per unitminimum 0.01
100
Cost per unitminimum 0
45
Discount offeredaccepts 0–100 %
20 %
Units sold at full priceminimum 0
1,000

Results

Extra Volume Needed to Hold Profit
57.20%
Margin Before Discount
55.00%
Margin After Discount
43.75%
Gross Profit Before
$55,000.00
Units Needed at the Discounted Price
1,572

Step by step

  1. 1Values used
  2. 2Discount Impact
  3. 3Extra Volume Needed to Hold Profit= 57.20
  4. 4Margin Before Discount= 55.00
  5. 5Margin After Discount= 43.75
  6. 6Gross Profit Before= 55,000.00
  7. 7Units Needed at the Discounted Price= 1,572

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

How is Discount Impact calculated?

Units needed = original gross profit ÷ contribution per unit after the discount A discount comes entirely out of contribution, not revenue, so a 20% discount on a 55% margin removes over a third of the profit per unit. Holding profit flat then requires a far larger volume increase than the discount itself.

Why does Discount Impact matter?

The required volume uplift is almost always larger than anyone expects, which is why discounting is the fastest way to grow revenue and shrink profit at the same time.

What values do I need to enter?

This calculator takes 4 inputs: Full price per unit, Cost per unit, Discount offered, Units sold at full price. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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