Quick answer
How do you calculate the price after a discount?
The discount price is the original price × (1 − discount ÷ 100). A ₹2,499 item at 40% off costs ₹1,499.40. Stacked offers multiply: 40% + 10% extra means paying 0.6 × 0.9 = 54% of the price, which is 46% off in total, so you pay ₹1,349.46.
- Sale price = price × (1 − discount/100)
- Stacked offers: 50% + 20% = 60% off, not 70%
- Original price = sale price ÷ (1 − discount/100)
How do you calculate the sale price and how much you save?
Turn the percentage off into the share you still pay. At 30% off you pay 70% of the price, or 0.7. The saving is the original price minus the sale price.
To use the discount calculator, enter the original price and the discount, or tap a quick option. Add an extra discount if the shop runs a stacked offer, and a tax rate if tax is added at the till.
How do stacked discounts work?
Sale offers like “50% off + extra 20%” apply one discount after the other. Multiply the remaining fractions: 0.5 × 0.8 = 0.4, so you pay 40% of the price, a total discount of 60%.
Take a ₹4,999 jacket at 30% off plus an extra 10%. You pay 0.7 × 0.9 = 63% of the price, which is ₹3,149.37. You save ₹1,849.63, a total discount of 37%, not 40%.
Is GST or sales tax added before or after the discount?
In India, GST is charged on the price after a discount shown on the invoice. Most shop prices already include GST, so you only need the tax box when a price is quoted before tax. On the jacket above, 18% GST on ₹3,149.37 adds ₹566.89, for a final price of ₹3,716.26.
In the US, shelf prices usually exclude sales tax, which is added at the till on the discounted price. A $80 item at 25% off costs $60. With a local sales tax of 8%, you pay $64.80. Rates vary by state and city, so enter the rate on your receipt.
How do you find the original price from a sale price?
Divide the sale price by the share you paid. A ₹1,349.46 price after 46% off in total was originally ₹1,349.46 ÷ 0.54 = ₹2,499. This is a quick way to check whether a “was” price on a sale tag adds up.
Frequently asked questions
How do I calculate a discount?
Multiply the price by the discount percentage and divide by 100 to get the saving, then subtract it from the price. 40% off ₹2,499 saves ₹999.60, so you pay ₹1,499.40.
Is 50% + 20% off the same as 70% off?
No. The extra 20% applies to the already halved price, so 50% + 20% is 60% off in total. On ₹1,000 you pay ₹400, not ₹300.
How do I find the original price from a sale price?
Divide the sale price by (1 − discount ÷ 100). A ₹750 item at 25% off was originally ₹750 ÷ 0.75 = ₹1,000.
Is GST charged before or after the discount?
In India, GST is charged on the price after a discount shown on the invoice. Enter the GST rate in the tax box to see the final amount.
How do I work out the discount percentage from the old and new price?
Subtract the sale price from the original price, divide by the original price and multiply by 100. An item cut from ₹1,800 to ₹1,350 is (450 ÷ 1,800) × 100 = 25% off.
Does the discount calculator work in dollars and other currencies?
Yes. Choose ₹, $, £ or € from the currency menu. The maths is the same in every currency; only the number formatting changes.