Discount Calculator
Enter a price and a % off to see the sale price and exactly how much you save.
How to use
- Enter the original price.
- Enter the discount percentage (e.g. 25 for 25% off).
- Optionally add a sales tax percentage — tax is applied to the discounted price. The final price and savings update instantly.
Examples
25% off a $80 jacket
The discount is $20, so the sale price is $60. You save $20.
20% off with 10% sales tax
A $100 item at 20% off costs $80; adding 10% tax on the discounted price gives a final price of $88.
Coupon on top of a sale price
An item at 50,000 KRW with 20% off and an extra 10% coupon does not come to 35,000. The coupon applies to the already-discounted 40,000, giving 36,000 — an effective 28% off. Stacked discounts always multiply, so 0.8 × 0.9 = 0.72 of the original.
Deciding between two offers
30% off versus buy-one-get-one-free on the same item are not the same deal. BOGO is effectively 50% off if you want two, and 0% off if you want one. Convert every offer into an effective per-unit price before comparing, because the framing is designed to make comparison hard.
Checking a marked-up markdown
A price raised before a sale makes the headline discount look larger than the real saving. If an item was 40,000, went to 60,000, then dropped 30% to 42,000, the sale price is above the original. Comparing the final price against the price you remember — not against the crossed-out one — is the only reliable check.
FAQ
How is the sale price calculated?
Sale price = original price × (1 − discount ÷ 100). A 25% discount on $80 is 80 × 0.75 = $60.
Is tax applied before or after the discount?
After. Retailers charge tax on the amount you actually pay, so this calculator applies the tax percentage to the discounted price.
How do I stack two discounts, like 20% off plus an extra 10%?
Sequential discounts multiply instead of adding: 20% then 10% is 0.80 × 0.90 = 0.72, i.e. 28% off in total, not 30%. Run the calculator twice, feeding the sale price back in.
Why is my discount limited to 0–100%?
More than 100% off would mean a negative price, which no sale means in practice — so values outside 0–100 are flagged as errors.
What percentage did I actually save?
Divide the amount saved by the original price. Paying 36,000 for something listed at 50,000 saves 14,000, which is 28%. Working from the final price rather than adding up the advertised rates is the only way to compare offers that stack differently.
How do I find the original price from a sale price?
Divide by one minus the discount rate. A 30%-off item selling at 63,000 came from 63,000 ÷ 0.7 = 90,000. Adding 30% back to the sale price gives 81,900, which is wrong for the same reason that removing a percentage and re-adding it never returns the start.
Is Korean VAT included in the displayed price?
For consumer retail in Korea, yes — displayed prices are generally VAT-inclusive by law, so a discount applies to a price that already contains tax. Business-to-business quotes are often stated excluding VAT, which is why the same nominal discount can produce different final numbers depending on which kind of price you started from.