Discount Calculator
To calculate discounted price: multiply original price by (1 - discount%). For 25% off $80: $80 × 0.75 = $60. You save $20. To find discount percentage: (Original - Sale) / Original × 100. Stacking discounts: apply each sequentially, not additively. 20% off then 10% off = 28% total discount (not 30%). Formula: Original × (1-d1) × (1-d2). For example, $100 with 20% then 10% = $100 × 0.80 × 0.90 = $72.
Calculate sale prices, discounts, and savings. Find final price after discount, reverse-calculate discount percentage from sale price, stack multiple discounts (e.g., 20% off then extra 10% off), add sales tax after discount, and visually compare original vs discounted prices.
Original Price
Discount Percentage
Quick Presets
Sales Tax (Optional)
You Pay
$80.00
Original Price
$100.00
Discount Amount
-$20.00
You Save
$20.00 (20%)
Price Comparison
Discount Formulas
- Final Price = Original × (1 − Discount% / 100)
- Discount Amount = Original × (Discount% / 100)
- Discount % = ((Original − Final) / Original) × 100
- Stacked: apply each discount sequentially to the reduced price
- With Tax: Total = Final Price × (1 + Tax% / 100)
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- How do I calculate a discount?
- Discount amount = Original price × (Discount percentage / 100). Final price = Original - Discount. For 25% off $80: Discount = $80 × 0.25 = $20. Final price = $80 - $20 = $60. Or: $80 × 0.75 = $60 directly.
- How do I find the original price from sale price?
- Original = Sale price / (1 - Discount rate). If item is $60 after 25% off: Original = $60 / 0.75 = $80. Use the Reverse tab to enter the original and sale price, and the calculator finds the discount percentage automatically.
- How do I calculate discount percentage from two prices?
- Discount % = ((Original - Sale price) / Original) × 100. If original is $80, sale is $60: Discount = ($80-$60)/$80 × 100 = 25%. Use the Reverse tab for instant calculation.
- How do stacked discounts work?
- Multiple discounts apply sequentially, not additively. 20% off then 10% off ≠ 30% off. $100 with 20% off = $80. Then 10% off $80 = $72. Total effective discount: 28%, not 30%. Use the Stacked tab to calculate multiple discounts applied in order.
- How do I calculate discount with sales tax?
- Apply the discount first, then add tax on the discounted price. For 20% off $100 with 8% tax: Discounted price = $80. Tax = $80 × 0.08 = $6.40. Total = $86.40. Enable the sales tax option in Basic or Stacked tabs.
- What is the difference between percent off and dollars off?
- Percent off scales with price (20% off $100 = $20, off $50 = $10). Dollars off is fixed ($20 off regardless of price). Percent off is better for expensive items. Compare: 20% off $150 ($30) vs $25 off—percent off wins.