Discount Amount = Original × (Discount% ÷ 100) Final Price = Original − Discount Amount Original from Sale = Sale Price ÷ (1 − Discount%/100) Discount % = ((Original − Sale) ÷ Original) × 100 Successive discounts = 100 − (1−d1/100)×(1−d2/100)×100
Successive discount myth: 20% off then 10% off ≠ 30% off. Actual = 1 − (0.80 × 0.90) = 28% total. On ₹1,000: you pay ₹720, saving ₹280, not ₹300.
Frequently Asked Questions
Discount = ₹999 × 20 ÷ 100 = ₹199.80. Final price = ₹999 − ₹199.80 = ₹799.20. You save ₹199.80.
No — successive discounts don't add. 20% then 10% = 1 − (0.80 × 0.90) = 28% total, not 30%. On ₹1,000: you pay ₹720, saving ₹280 not ₹300. This is a common retailer marketing trick.
Original = Sale Price ÷ (1 − discount/100). Example: Paid ₹750 after 25% off → Original = ₹750 ÷ 0.75 = ₹1,000.
Discount % = ((Original − Sale) ÷ Original) × 100. Example: ₹1,000 item sold at ₹799 → ((1000−799)÷1000)×100 = 20.1%.
GST is on the actual transaction value (selling price after discount). If a ₹1,000 item sells at ₹800 with 18% GST, the GST is ₹144 (18% of ₹800), not ₹180 (18% of MRP).
Maintained by the RupeeCalc editorial workflow. Last checked: 29 May 2026. This page gives informational estimates only; verify official sources, your own documents, and a qualified professional before filing taxes, taking loans, investing, invoicing, or making compliance decisions.
A discount is not always the final saving. Many online offers depend on coupon conditions, card eligibility, minimum order value, platform fee, GST, delivery charge, cashback delay, wallet restrictions, or return-policy limitations. A 20% discount with high delivery fee may be worse than a smaller instant discount with a clean final price.
Use the calculator to convert percentage discounts into rupee savings and final payable amount. Then compare the final checkout price, not only the advertised offer banner. For expensive purchases, also check warranty, seller rating, return window, and whether cashback is instant or conditional.
Offer-checking checklist
Check if discount applies before or after GST.
Confirm maximum discount cap.
Check whether cashback is instant, delayed, or wallet-only.
Compare delivery, platform, and convenience fees.
Do not buy only because the discount percentage looks large.