Discount calculator
Find the price after a discount, the amount saved and the real % off for double discounts like 20% + 10%. Add GST after the discount in one tap.
How to use this discount calculator
- Type the price.
- Pick % off or ₹ off and type the discount.
- For an offer like “20% + 10%”, type 10 in the extra discount box.
- Pick a GST rate to add GST after the discount.
Why 20% + 10% is not 30%
The second discount is on the already reduced price. ₹1,000 less 20% is ₹800; 10% off ₹800 is ₹80, so you pay ₹720. That is ₹280, or 28% off, not 30%.
Discount and GST
A discount shown on the invoice at the time of sale reduces the taxable value, so GST is charged on the price after the discount. ₹1,000 less ₹150 is ₹850, and 18% GST is ₹153, not ₹180.
Quick discount table on ₹1,000
| Discount | You pay | You save |
|---|
| 5% | ₹950 | ₹50 |
| 10% | ₹900 | ₹100 |
| 15% | ₹850 | ₹150 |
| 20% | ₹800 | ₹200 |
| 25% | ₹750 | ₹250 |
| 50% | ₹500 | ₹500 |
Price after discount
Price × (100 − Discount %) ÷ 100.
₹1,000 at 20% off = ₹800Double discount
The second discount is taken on what is left after the first.
20% + 10% = 28% off, not 30%Rounded to 2 decimals.
Questions
Discount calculator FAQ
How do I calculate a discount?
Multiply the price by the discount % and divide by 100; take that from the price. 20% off ₹1,000 is ₹200 off, so you pay ₹800.
Is GST charged before or after the discount?
After. A discount on the invoice reduces the taxable value, so GST is on the discounted price.
How do I work out 20% + 10% off?
Take 20% off first, then 10% off the new price. On ₹1,000 that is ₹800, then ₹720: 28% off in all.
How do I find the discount % from two prices?
(Original price − Sale price) ÷ Original price × 100. ₹1,000 down to ₹850 is a 15% discount.
Billman