Discount Impact Calculator – Revenue Effect

Quick answer

See profit lost per % off: 20% discount needs +25% volume to hold margin.

$60 item → $48, margin drops 32%→15%.
Volume needed shown.

Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.

How Discounts Impact Profit

Required Volume Increase = Old Margin ÷ New Margin − 1

A discount comes straight out of margin, so the volume needed to break even rises faster than the cut. Worked example: a $60 item costing $40 has a $20 (33.3%) margin; a 20% discount drops price to $48 and margin to $8 (16.7%). To earn the same total profit you must sell 20 ÷ 8 = 2.5× — a 150% volume jump, not 20%. The rule: required volume = old margin ÷ new margin. Run every promotion through this math before printing the sale sign.

1
Enter price and cost
Current selling price and unit cost.
2
Enter discount %
The planned percentage off.
3
Read the impact
New margin, profit per unit and required volume.

Use Cases

Promo planning

Set the deepest discount that volume can realistically cover.

Margin protection

Define per-category discount floors before sale season.

Negotiating with marketplaces

Quantify what a platform-wide coupon really costs you.

Common Mistakes

Assuming a 20% discount needs only 20% more sales
Discounting best-sellers instead of aging inventory
Forgetting that marketplaces stack their promos on top of yours

FAQs

Why does 20% off need more than 20% more sales?

The discount shrinks the margin each sale contributes, so volume must multiply, not just add.

How much discount is safe?

Stay under half your margin percentage: with 40% margin, 15-20% off keeps required volume realistic.

Do discounts build loyalty?

Rarely — they train deal-hunting; bundles and added value protect margin better.

What about Buy 2 Get 1?

It reads as 33% off across three units but often moves more units than a straight cut.

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