Discount Calculator
Final price, total savings, and effective rate — including successive (stacked) discounts
| Final price | Rs 4,000 |
| Total saved | Rs 1,000 |
| Effective discount rate | 20.00% |
Frequently Asked Questions
Calculating final price and savings from a discount seems straightforward for a single discount, but successive (stacked) discounts — "30% off, then an additional 10% off" — don't simply add together to a flat 40% off, which is a common and costly misunderstanding when comparing promotional offers.
Why stacked discounts don't add together
When a second discount is applied to an already-discounted price, it's calculated on the reduced price, not the original price — which means two successive discounts always produce a smaller total savings than simply adding the two percentages together would suggest. A 30% discount followed by an additional 10% discount results in a combined discount that's meaningfully less than a flat 40% off, since the second 10% is taken off a price that's already 30% lower than the original, not off the original price itself. This gap between "add the percentages" and the true combined discount grows larger the bigger the individual discount percentages are.
A worked example
An item marked "30% off, plus an extra 10% off" and an item marked simply "40% off" are not the same deal, even though a quick mental addition might suggest they are — the stacked-discount item's true combined savings percentage is smaller than 40%, since the second discount only applies to the already-reduced price, which is exactly the kind of promotional math that benefits from an actual calculation rather than mental addition.
How this connects to your other everyday calculations
For working out an effective discount percentage from a final sale price rather than starting from stated discount percentages, this calculator's reverse-direction logic mirrors how the Profit Margin Calculator works backward from price figures to a percentage rate, using related but distinct percentage math.
Common mistakes
Adding successive discount percentages together to estimate total savings — treating "30% off then 10% off" as equivalent to a flat 40% off — is the single most common discount-math mistake, and retailers advertising stacked discounts benefit from this common misconception, since the true combined discount is always smaller than the naive sum suggests.