Discount Calculator
Enter the original price and the discount to see what you actually pay — including what a second "extra" discount really adds up to.
Last updated
Final price
₹1,200
You save ₹800 on the original price
Price split
- You pay: ₹1,200
- You save: ₹800
- Original price
- ₹2,000
- Total discount
- −₹800
- Price after discount
- ₹1,200
How this calculator works
A single discount is straightforward: multiply by one minus the rate. Where retail gets interesting is the second discount — the "extra 20% off already reduced prices" that appears at checkout.
Those discounts apply sequentially, not additively. Fifty percent off followed by twenty percent off is not seventy percent off; it is sixty. The second discount is calculated on the already-reduced price, so it removes less in absolute terms than the headline suggests.
The gap widens as the discounts get larger. A "70% + 30%" offer sounds like the item is free. It is actually 79% off — generous, but not free.
The GST option exists because Indian retail prices are usually inclusive of tax, but not always. If the discounted price is exclusive, tax is added to the reduced figure, not the original.
The formula
Single discount
final price = original × (1 − discount ÷ 100)
Two stacked discounts
final price = original × (1 − d₁ ÷ 100) × (1 − d₂ ÷ 100)
Multiplication, not addition. This is why 50% + 20% is 60% off rather than 70%.
Effective discount
effective % = ((original − final) ÷ original) × 100
Worked example: 50% off, then an extra 20% off
An item priced at ₹2,000 is advertised at 50% off, with an extra 20% off at checkout.
| Original price | ₹2,000 |
|---|---|
| After 50% off | ₹1,000 |
| After a further 20% off | ₹800 |
| Total saved | ₹1,200 |
| Effective discount | 60% |
| If the discounts genuinely added to 70% | ₹600 |
| Difference | ₹200 |
The real discount is 60%, not 70%. The item costs ₹800 rather than the ₹600 the advertising implies — a ₹200 gap on a ₹2,000 item.
Things worth knowing
- Stacked discounts multiply, they never add. Two discounts of 50% and 20% give 60% off in total.
- Discounts advertised against "maximum retail price" can be misleading if the MRP was never the actual selling price.
- Check whether the quoted price includes GST. In Indian retail it usually does, but online marketplaces and services sometimes show tax separately at checkout.
- Bank and card offers are often capped in rupees regardless of the percentage advertised. "10% instant discount up to ₹1,000" is only 10% on purchases below ₹10,000.
- Coupon codes may apply to the pre-discount or post-discount price depending on the retailer. The order changes the final amount.