Discount Calculator
Quickly determine the final sale price, total savings, and breakdown of discounts. Supports stacked double-discounts and sales tax or GST calculations.
Final Price
₹800
You Save
₹200
Discount Percent
20%
Detailed Price Breakdown
How to Use the Discount Calculator
- Enter the **Original Price** of the item before any discount.
- Set the primary **Discount Percentage** (e.g. 20% off).
- Check **Add an additional stacked discount** if the store offers a secondary coupon or discount on top of the sale price (e.g. extra 10% off at checkout).
- Check **Calculate Sales Tax / GST** if you want to find the final on-the-road price after tax has been added.
- The calculator instantly updates the final cost, money saved, and total discount percentage.
Discount Calculation Formula
To calculate discounts and taxes, the math is applied in sequential steps:
Price 1 = Original Price x (1 - Discount 1 / 100)
Step 2: Stacked Discounted Price (if applicable)
Price 2 = Price 1 x (1 - Discount 2 / 100)
Step 3: Final Cost with Tax (if applicable)
Final Price = Price 2 x (1 + Tax Rate / 100)
Understanding Stacked and Double Discounts
Retail stores and online shopping platforms often advertise double discounts, such as "20% off sale items plus an extra 10% off at checkout." Many shoppers assume these percentages are added together to make 30% off. However, in retail math, discounts are applied sequentially.
If you purchase a ₹1,000 item with a 20% + 10% discount: the first 20% off reduces the price to ₹800. Next, the 10% checkout discount is applied to the ₹800, reducing it by ₹80 to a final price of ₹720. Your actual total discount is 28%, saving you ₹280. Our calculator does this math automatically, showing you the true cost and savings breakdowns before you reach the register.
Frequently Asked Questions
How is a discount calculated?
To calculate a discount, multiply the original price by the discount percentage divided by 100. Subtract this savings amount from the original price to find the discounted price.
How do you calculate a double or stacked discount?
Stacked discounts are calculated sequentially, not added together. For example, if a product has a 20% discount plus an additional 10% off, you first subtract 20% from the original price, and then subtract 10% from that new discounted price (which represents a total discount of 28%, not 30%).
How do I calculate the final price including sales tax/GST?
First, apply the discount(s) to the original price to find the discounted price. Next, multiply this discounted price by the tax percentage divided by 100 to get the tax amount. Add the tax amount to the discounted price to get the final price.
Why does my final price show a different discount percentage when tax is added?
When you add sales tax or GST, the tax increases the final price, which offset some of your discounts. This calculator displays your net discount percentage to show your actual real-world savings.