Question 1

How do I calculate a percentage discount?

Accepted Answer

To calculate a discount: Discount Amount = Original Price × (Discount % / 100). Final Price = Original Price − Discount Amount. For example, a 25% discount on a $80 item: Discount = $80 × 0.25 = $20. Final Price = $80 − $20 = $60. You saved $20, which is 25% of the original price.

Question 2

How do I find the original price before a discount?

Accepted Answer

If you know the final (sale) price and the discount percentage, the original price is: Original Price = Final Price / (1 − Discount% / 100). For example, if a sale price is $60 after a 25% discount: Original Price = $60 / (1 − 0.25) = $60 / 0.75 = $80.

Question 3

How do I find what percentage discount was applied?

Accepted Answer

Discount Percentage = ((Original Price − Sale Price) / Original Price) × 100. For example, original price $120, sale price $90: Discount % = ((120 − 90) / 120) × 100 = (30 / 120) × 100 = 25%.

Question 4

What is the difference between percentage off and percentage of?

Accepted Answer

25% off means you pay 75% of the original price — the discount is subtracted. 25% of means you calculate 25% of a number — typically for finding a portion. In retail, discounts are always expressed as 'off', meaning the percentage is removed from the price. When a store says '30% off', you pay 70% of the sticker price.

Question 5

How do stacked or multiple discounts work?

Accepted Answer

Stacked discounts (e.g. 20% off plus an extra 10% off) do NOT add together to 30% off. Each discount applies to the already-reduced price. Starting with $100: first 20% off = $80; then 10% off $80 = $8 more off = $72 final. Total savings = $28 = 28%, not 30%. The order of discounts does not affect the final price when stacking.

Question 6

What does 'buy one get one 50% off' actually mean?

Accepted Answer

BOGO 50% off means when you buy two items, the second (usually cheaper) item is 50% off. If both items cost the same price P, total cost = P + 0.5P = 1.5P, giving an effective 25% overall discount on both items combined. This is less than a straight 50% off deal. Retailers use this format because it requires you to buy two items to get the discount, increasing basket size.

Question 7

How do I calculate tax after a discount?

Accepted Answer

Sales tax is applied to the final (post-discount) price, not the original price. For example: original $100, 20% discount = $80 sale price, then 8% sales tax on $80 = $6.40, so total = $86.40. In most jurisdictions, tax is computed on the amount actually paid, not the pre-discount price. This calculator computes the discounted price before tax — add your local tax rate to the discounted price for a full total.

Question 8

What is a good discount percentage for retail sales?

Accepted Answer

From a shopper's perspective: 5-10% is a small loyalty/newsletter discount; 15-25% is a typical seasonal or holiday sale; 30-50% is a significant sale often indicating clearance or end-of-season; 50%+ is a deep clearance or liquidation discount. From a retailer's perspective, sustainable discounts depend on margin — a product with 60% gross margin can offer up to 40% off and still be profitable, while a 20% margin product cannot sustain heavy discounting.

Question 9

How does compound discounting work over time?

Accepted Answer

Compound discounting applies repeated percentage reductions. A product marked down 20% in week 1 and then 15% more in week 2 ends up at: $100 × 0.80 × 0.85 = $68, a total 32% reduction (not 35%). This is the same mathematics as compound interest in reverse. Weekly clearance markdowns in retail use this principle — each markdown reduces the already-reduced price, not the original.

Question 10

Is my data private when using this calculator?

Accepted Answer

Yes, completely. All discount calculations run entirely in your browser using JavaScript. No prices or percentages you enter are transmitted to any server, stored, or shared. The calculator works fully offline once the page loads.

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