IndCalc
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Calculate sale price after % off, total savings, effective discount on stacked offers, and reverse-engineer the original MRP from a discounted price. INR + USD supported.
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Single discount: Sale Price = MRP × (1 − d/100), where d is the discount percentage. Total savings = MRP − Sale Price = MRP × d/100. Simple, common, but stores often dress it up to look more impressive.
Stacked discount (e.g., '30% off + extra 10%'): Apply discounts sequentially. Total Sale = MRP × (1 − d₁/100) × (1 − d₂/100). The effective combined discount is NOT d₁ + d₂; it's always less. 30% + 10% = 37% effective, not 40%.
Reverse discount (find MRP from sale): Original = Sale Price ÷ (1 − d/100). Useful when stores show only the discounted price and you want to verify the 'savings' marketing matches reality.
In Indian retail, discount is applied BEFORE GST. A ₹1,000 product with 20% off and 18% GST = (₹1,000 × 0.80) + (₹800 × 0.18) = ₹800 + ₹144 = ₹944 final. GST is computed on the post-discount taxable value, which means a higher discount also reduces the GST you pay.
Some unscrupulous retailers compute GST on MRP first, then apply 'discount' on the post-tax value to make the discount look bigger. This is technically incorrect and shortchanges the buyer. Always check the invoice line-by-line — the taxable value should equal MRP minus discount, NOT MRP itself.
For tax-exempt items (basic groceries, books, etc.), there's no discount-vs-tax order to worry about. For luxury items (jewellery, electronics with 28% GST, alcohol), the order matters meaningfully — a 30% discount can save you 30% of GST too, not just 30% of the base price.
'Up to 70% off' — the highest-discount items are usually a few low-stock SKUs or unpopular sizes. Real average discount across the catalog is often 20-30%. Check actual prices before celebrating.
'Buy 1 Get 1 Free' = 50% effective discount. 'Buy 2 Get 1 Free' = 33.33% effective. 'Buy 3 Get 1 Free' = 25% effective. These bundle deals often look bigger than they are; they're really volume-discount math.
'Flat 50% off' is genuinely 50%. 'Up to 50% off' is at most 50% — most items in the sale will be discounted less. Watch for the word 'flat' as the honest signal of uniform discount across all items.