Discount Calculator
Sale season rarely offers one clean discount: a coupon takes 20% off, then a bank offer knocks a further 10% off whatever remains. Because the second discount lands on the reduced price, the true saving is smaller than the sum of the stickers — 20% plus 10% is 28%, not 30%. This calculator stacks discounts multiplicatively, shows the final price and rupees saved, and reports the one effective percentage.
Enter values
Results
- Final price
- ₹1,599.20
- You save
- ₹399.80
- Total effective discount
- 20%
How is the Discount calculated?
Enter the original listed price, the first discount percentage — the coupon or sale markdown — and an optional second discount applied afterwards, such as a card offer at checkout. The calculator reduces the price twice, returns the final price, subtracts it from the original to show what you save, and compresses both discounts into one effective percentage. Leave the second discount at zero for a single markdown, and the effective figure simply equals the first.
Formula
final = price × (1 − d1 ÷ 100) × (1 − d2 ÷ 100) saved = price − final effective discount = 100 × (1 − (1 − d1 ÷ 100) × (1 − d2 ÷ 100)) where: price = original listed price d1 = first discount percentage d2 = second discount percentage, applied to the reduced price Stacked discounts multiply, they never add.
Example
Original price: ₹1,999 · First discount: 20% · Second discount: 10% After the first discount: 1,999 × 0.80 = ₹1,599.20 Final price: 1,599.20 × 0.90 = ₹1,439.28 You save ₹559.72 — an effective 28%, not the 30% that adding the stickers suggests. The extra ₹39.98 never comes off because the 10% only ever touched ₹1,599.20, not the full ₹1,999.
Things to remember
Stacked percentages are how retail offers are designed, and the fine print decides whether stacking is even allowed — many schemes cap the second discount or exclude reduced items. Compare offers by the effective percentage here, not by adding the numbers on the tags, and confirm the final figure at checkout.
Frequently Asked Questions
How do you calculate two discounts in a row?
Apply each discount in turn: reduce the price by the first percentage, then take the second percentage off the reduced figure. On ₹1,999, 20% then 10% gives ₹1,599.20 and then ₹1,439.28 — never ₹1,999 minus 30%, which would overstate the saving.
Are two 50% discounts the same as one 100% discount?
No — two 50% discounts leave a quarter of the price, not nothing: halve once to 50%, then halve again. Stacked percentages multiply, so 50% plus 50% is an effective 75% off, and the item is never actually free.
How do I find the effective percentage of stacked discounts?
Multiply the remaining shares — 0.80 for 20% off, 0.90 for 10% off — and subtract the product from 1: 0.80 × 0.90 = 0.72, so the effective discount is 28%. This calculator shows that figure beside every result.
Does GST apply before or after a discount?
In India, GST is computed on the price you actually pay, so the discount comes first and the tax applies to the discounted value. A 28% effective discount on a ₹1,999 item also reduces the GST due on it — the bill, not the sticker, is what gets taxed.
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