Discount Calculator
See the final sale price and exactly how much you save.
How the calculator works
A simple discount multiplies the original price by the discount percentage and subtracts the result: 25% off an $80 item removes $20, leaving $60. Stacked discounts apply in sequence rather than together — the second percentage acts on the already-reduced price, so “30% + 10%” is not 40% but 1 − 0.70 × 0.90 = 37%. The calculator displays this effective figure so you can compare a stacked promotion against a single flat discount honestly. The “you pay” row is simply the final price divided by the original one, expressed as a percentage of the original price.
Formula
You save = Price − Final price
Where:
- Price — the original price before any discount
- d₁, d₂ — discount rates as decimals (25% = 0.25), applied in order
- Effective discount = 1 − (final ÷ original)
Example
A $80 jacket at 25% off: the discount is 80 × 0.25 = $20, so the final price is $60 and you pay 75% of the original. Add a members-only extra 10%: the second cut removes 10% of $60 — another $6 — landing at $54. The effective discount is 32.5%, not 35%: the labels overstate the deal by 2.5 points, which the effective row makes obvious.