How to Analyze Margin Erosion from Promotions, Discounts, and Sales
Calculate the exact sales volume increase required to offset a 10%, 20%, or 30% price cut without sacrificing absolute take-home profits.
Why is discounting blindly so dangerous?
A 20% discount on your retail price does NOT reduce your profit by 20%: it can slash your net profit by 60% to 80%!
Because product COGS, shipping charges, and advertising expenses remain strictly fixed, the entire price cut is deducted directly from your net margin.
This calculator reveals the exact additional sales volume needed to maintain your baseline profit after offering promotional discounts.
Compensation volume calculation
The tool evaluates gross margin before and after the price reduction to determine the necessary sales multiplier:
Required Sales Volume = Baseline Margin / Discounted Margin.
It displays the erosion threshold to alert you when a discount becomes actively destructive.
Concrete Real-World Case Study
Product sold at 200 MAD with a 30% margin (60 MAD profit)
- Baseline profit per unit: 200 - 140 = 60 MAD
- New profit after 30 MAD discount: 170 - 140 = 30 MAD (cut in half!)
- Required sales volume increase: (60 / 30) = 2X
Strategic Optimization Tips
- • Offer a high-perceived-value gift with minimal cost of goods rather than giving away direct cash discounts.
- • Always place an expiration countdown timer on discount codes to spur urgency without cheapening brand perception.