What is a Discount Calculator?
A discount calculator is a financial tool that instantly computes the sale price of an item after applying a percentage discount. Whether you’re shopping during a sale, comparing deals, or running a promotion, our discount calculator saves you time and eliminates errors.
How to Calculate a Discount
The formula for calculating a discounted price is:
- Discount Amount = Original Price × (Discount % ÷ 100)
- Final Sale Price = Original Price − Discount Amount
Example
A jacket originally priced at $120 is on 25% off sale:
- Discount Amount = $120 × 0.25 = $30.00
- Final Price = $120 − $30 = $90.00
How to Find the Discount Percentage
If you know the original and sale prices but not the discount percentage:
- Discount % = ((Original Price − Sale Price) ÷ Original Price) × 100
Example: $120 original, $90 sale → ((120−90)÷120)×100 = 25% off
Common Discount Percentages and Their Effects
| Discount % | $50 Item | $100 Item | $500 Item |
|---|---|---|---|
| 10% | $45 | $90 | $450 |
| 20% | $40 | $80 | $400 |
| 25% | $37.50 | $75 | $375 |
| 30% | $35 | $70 | $350 |
| 50% | $25 | $50 | $250 |
| 70% | $15 | $30 | $150 |
Stacked Discounts: Is 30% + 20% Off = 50% Off?
No! Stacked discounts don’t simply add up. When two discounts are applied sequentially:
- Start: $100
- After 30% off: $70
- After additional 20% off $70: $56
- Total effective discount: 44%, not 50%
Frequently Asked Questions
What does “buy one get one 50% off” mean?
You pay full price for one item and half price for the second. The effective discount on two items is 25%.
How do I calculate tax after a discount?
Apply the discount first, then calculate tax on the discounted price: Final = (Original × (1 − Discount%)) × (1 + Tax%).
Is a 40% discount better than two 20% discounts?
A single 40% discount is slightly better. Two 20% discounts yield: 1 − (0.8 × 0.8) = 36% effective discount.