About the discount calculator
Shops advertise discounts as a percentage off. Enter the original price and the percentage to see the sale price and how much you save. You can stack a second discount, such as a coupon, and add sales tax to see the price at the register.
The other tabs work backwards: find the percentage from the original and sale prices, or find the original price from a sale price and its percentage.
Two stacked discounts are applied one after the other, so 20% plus 10% is 28% in total, not 30%.
Formula
- Sale price = Original × (1 − discount ÷ 100)
- Discount % = (1 − Sale ÷ Original) × 100
- Original = Sale ÷ (1 − discount ÷ 100)
Example
A $100 jacket at 20% off sells for $80, so you save $20. If the sale price is $80 and the discount was 20%, the original price was $80 ÷ 0.8 = $100.