Overview

The Discount Calculator computes the final price after applying a discount percentage, or reverse-calculates the discount rate between two prices. It helps you quickly see how much you save during sales, with coupons, or special offers.

Formula

Discount Amount = Original Price × (Discount Rate / 100). Final Price = Original Price − Discount Amount. Discount Rate = ((Original Price − Sale Price) / Original Price) × 100.

How to Use

1. 1Enter the original price.
2. 2Enter the discount rate (%).
3. 3The discount amount and final price are displayed automatically.
4. 4Alternatively, enter both original and sale prices to reverse-calculate the discount rate.

Examples

Background

Discount calculations are among the most frequently needed arithmetic in daily consumer life. In Korea, consumer prices displayed are inclusive of VAT (10%), so discount rates apply directly to the listed price. Stacked discounts (e.g., store sale + coupon) are applied sequentially rather than added together. For example, a 20% + 10% double discount results in an effective 28% discount, not 30%. Savvy consumers compare the total effective discount including card cashback, reward points, and other benefits for the best deal.

Tips

• ✔Stacked discounts (coupon + sale) are applied sequentially, so they differ from simple addition.
• ✔Verify the original price has not been inflated before the sale.
• ✔Factor in credit card cashback or reward points for the effective discount rate.
• ✔A buy-one-get-one-free offer is equivalent to a 50% discount.

FAQ