How to use the Discount Calculator
Choose the calculation you need from the tabs above, enter your values and the result appears instantly.
Sale Price tab
Enter the original price and the discount percentage. Example: a $120 item with a 25% discount → sale price $90, you save $30.
Original Price tab
Enter the sale price and the discount applied. Useful for "reverse" calculations. Example: item costs $80 after a 20% discount → original price was $100.
Discount % tab
Enter both the original and the sale price to find out what percentage off was applied. Example: $100 original, $65 sale → 35% discount.
Discount formulas
| What you want | Formula |
|---|
| Sale price | Original × (1 − Discount% / 100) |
| Original price | Sale / (1 − Discount% / 100) |
| Discount % | (1 − Sale / Original) × 100 |
| Amount saved | Original − Sale |
FAQ — Discount Calculator
How do I calculate 20% off a price?
Multiply the original price by 0.20 to get the discount amount, then subtract from the original. Example: 20% off $50 = $50 × 0.20 = $10 savings → $40 sale price.
How do I find the original price after a discount?
Divide the sale price by (1 − discount/100). Example: $80 after a 20% discount → $80 / 0.80 = $100 original price.
What is the difference between a sale price and a discounted price?
They mean the same thing: the price after the discount has been applied. The "discount" refers to the amount or percentage subtracted from the original price.