Sale Discount Calculator
Calculate sale prices and savings with percentage or dollar discounts.
Formula
Discount Amount = Original Price × (Discount% / 100) Sale Price = Original Price − Discount Amount
How to Calculate
To calculate a percentage discount, multiply the original price by the discount percentage divided by 100. Subtract that discount amount from the original price to get the sale price. For dollar-amount discounts, simply subtract the discount from the original price.
For stacked discounts (e.g., 20% off plus an extra 10% off), do not simply add the percentages. Apply the first discount, then apply the second discount to the already-reduced price. A 20% discount followed by a 10% discount is not 30% off—it is actually 28% off the original price.
When running promotions, also consider the impact on your margins. If a product has a 50% margin and you offer a 30% discount, your margin drops to roughly 29%. Always calculate the discounted margin before committing to a promotion to ensure you remain profitable.
Worked Example
A $120 jacket is on sale for 25% off, and loyalty members get an additional 10% off.
First discount: $120 × (25/100) = $30 off → $120 − $30 = $90 Second discount: $90 × (10/100) = $9 off → $90 − $9 = $81
Total savings: $120 − $81 = $39 (which is 32.5% off, not 35%)
If the jacket cost the retailer $60, the margin at full price is 50%. At the $81 sale price, margin drops to ($81 − $60) / $81 = 25.9%.
Why It Matters
Discounting is one of the most powerful tools for driving sales, clearing inventory, and acquiring customers—but used carelessly it destroys profitability. Understanding the math behind discounts helps you design promotions that attract buyers without giving away your margins. It also helps you evaluate competitor pricing and decide whether to match their deals.
Practical Tips
- ✓Calculate the impact on your profit margin before offering any discount.
- ✓Use "buy more, save more" tiered discounts to increase average order value.
- ✓Set clear start and end dates for promotions to create urgency without permanent price erosion.
- ✓Track whether discounted customers return at full price—discounts that only attract deal-seekers can hurt long-term profitability.
Frequently Asked Questions
How do I calculate the original price from a sale price?
Is a 20% + 10% stacked discount the same as 30% off?
What is a loss leader pricing strategy?
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