Step	Formula	Example (₹2,000 at 25% off)
Savings	Original Price × (Discount % ÷ 100)	₹2,000 × 0.25 = ₹500
Price After Discount	Original Price − Savings	₹2,000 − ₹500 = ₹1,500
Tax Amount (if GST)	Price After Discount × (GST % ÷ 100)	₹1,500 × 0.18 = ₹270
Final Price (inc GST)	Price After Discount + Tax Amount	₹1,500 + ₹270 = ₹1,770

GST is applied on the discounted price, not the original MRP. So a 25% discount on ₹2,000 with 18% GST gives a final price of ₹1,770 — not ₹2,000 × 1.18 − 25%.

Discount Quick Reference Table (No GST)

Common discount percentages applied to popular price points — instant reference without opening a calculator.

Original Price	10% Off	20% Off	25% Off	30% Off	40% Off	50% Off
₹500	₹450	₹400	₹375	₹350	₹300	₹250
₹1,000	₹900	₹800	₹750	₹700	₹600	₹500
₹1,500	₹1,350	₹1,200	₹1,125	₹1,050	₹900	₹750
₹2,000	₹1,800	₹1,600	₹1,500	₹1,400	₹1,200	₹1,000
₹3,000	₹2,700	₹2,400	₹2,250	₹2,100	₹1,800	₹1,500
₹5,000	₹4,500	₹4,000	₹3,750	₹3,500	₹3,000	₹2,500
₹10,000	₹9,000	₹8,000	₹7,500	₹7,000	₹6,000	₹5,000
₹20,000	₹18,000	₹16,000	₹15,000	₹14,000	₹12,000	₹10,000

Stacked Discounts — What ‘Extra 20% Off’ Actually Means

During sale events (Flipkart Big Billion Days, Amazon Great Indian Festival, Myntra EORS), retailers often show “Flat 30% off + Extra 20% off with coupon.” Many shoppers assume this equals 50% off. It does not — it is 44% off.

First Discount	Extra Discount	Effective Total Discount	Example: ₹5,000 item
10%	10%	19% (not 20%)	₹4,050 (saves ₹950)
20%	10%	28% (not 30%)	₹3,600 (saves ₹1,400)
30%	10%	37% (not 40%)	₹3,150 (saves ₹1,850)
30%	20%	44% (not 50%)	₹2,800 (saves ₹2,200)
40%	20%	52% (not 60%)	₹2,400 (saves ₹2,600)
50%	10%	55% (not 60%)	₹2,250 (saves ₹2,750)

To calculate stacked discounts using this tool: Step 1 — apply the first discount, note the price after discount. Step 2 — enter that amount as the new original price, apply the second discount. The final result is your actual price.

How to Use This Calculator

Enter Original Price — the MRP or listed price before any discount
Enter Discount % — the percentage being offered (e.g., 20 for 20% off)
Enter Sales Tax % (Optional) — enter GST rate if applicable: 5% for essentials, 12% for most goods, 18% for electronics, 28% for luxury items
Results appear instantly — You Save, Price After Discount, Tax Amount, and Final Price (inc. tax)

For stacked discounts: run the calculator twice. Use the ‘Price After Discount’ from step 1 as your Original Price input in step 2.

Frequently Asked Questions (FAQ)

20% of ₹1,500 = ₹300. So 20% off ₹1,500 = ₹1,200. If 18% GST applies on top of the discounted price: ₹1,200 × 1.18 = ₹1,416 final price.

Use this formula: Original Price = Discounted Price ÷ (1 − Discount % ÷ 100). Example: if you paid ₹800 after a 20% discount, original price = ₹800 ÷ 0.80 = ₹1,000. This is useful when you see a sale price and want to verify what the MRP was.

GST is applied on the price after discount, not on the original MRP. This is the correct legal treatment in India — sellers must calculate GST on the transaction value (discounted price). So for a ₹2,000 item at 25% off with 18% GST: discounted price = ₹1,500, GST = ₹270, final = ₹1,770.

It means two successive discounts, not 40% off. First apply 30% off to get 70% of MRP, then apply 10% off that result. Effective discount = 1 − (0.70 × 0.90) = 37% — not 40%. On a ₹5,000 item: MRP → ₹3,500 (after 30%) → ₹3,150 (after extra 10%). Total saving = ₹1,850.

Yes. Enter the bill total as the original price and 15 as the discount %. For a restaurant bill with service charge, enter the service charge percentage in the tax field. The calculator works for any price × percentage scenario — products, services, subscriptions, or fees.