Discount Calculator
Calculate sale prices, savings, and discount percentages. Figure out original prices, stacked discounts, and find the best deals.
Discount Results
Final Price
$75
You Save
$25
25.0% off
What do you want to calculate?
Choose your calculation type
Values
Enter prices and discount percentages
Price Breakdown
Visual comparison of price and savings
Quick Reference
Common discount amounts at a glance
| Discount | You Pay | You Save |
|---|---|---|
| 10% off | $90 | $10 |
| 15% off | $85 | $15 |
| 20% off | $80 | $20 |
| 25% off | $75 | $25 |
| 30% off | $70 | $30 |
| 40% off | $60 | $40 |
| 50% off | $50 | $50 |
| 60% off | $40 | $60 |
| 70% off | $30 | $70 |
Discount Formulas
Mathematical calculations explained
Calculate Sale Price:
Sale Price = Original × (1 - Discount%/100)
Calculate Discount %:
Discount% = (Original - Sale) / Original × 100
Calculate Original Price:
Original = Sale Price / (1 - Discount%/100)
Stacked Discounts:
Final = Original × (1 - D1%) × (1 - D2%)
Stacked Discount Equivalents
Multiple discounts combined
Two successive discounts equal these single discounts:
| First | + | Second | = | Effective |
|---|---|---|---|---|
| 10% | + | 10% | = | 19% |
| 20% | + | 10% | = | 28% |
| 20% | + | 20% | = | 36% |
| 25% | + | 15% | = | 36.25% |
| 30% | + | 20% | = | 44% |
| 50% | + | 50% | = | 75% |
Quick Answer
To calculate a discounted price: Sale Price = Original Price × (1 - Discount%). For a 100 item at 30% off: 100 × (1 - 0.30) = 100 × 0.70 = 70. Savings = 100 - 70 = $30. Calculate any discount at practicalwebtools.com.
Key Facts
- Discount formula: Sale Price = Original × (1 - Discount%)
- Savings formula: Savings = Original × Discount%
- To find discount %: Discount = (Original - Sale) / Original × 100
- Stacked discounts multiply: 20% then 10% = 28% total (not 30%)
- "Up to X% off" often means best items have smaller discounts
- Compare unit prices, not just discount percentages
- Some "sales" inflate original prices before discounting
Adjust Discount
See how different discount percentages affect your savings
Personalized Insights
1 insight based on your inputs
Good News
Good discount of 25%. You're saving $25 on $100.
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Frequently Asked Questions
To calculate a discount: Savings = Original Price × (Discount % / 100). Final Price = Original Price - Savings. For example, a 20% discount on $50: Savings = $50 × 0.20 = $10. Final price = $50 - $10 = $40.
Stacked discounts apply sequentially, not additively. A 20% + 10% discount is NOT 30% off. First apply 20% to get a new price, then apply 10% to that result. $100 with 20% then 10% off = $100 × 0.80 × 0.90 = $72 (28% effective discount).
Use this formula: Original Price = Sale Price / (1 - Discount%). If an item is $60 after 25% off: Original = $60 / (1 - 0.25) = $60 / 0.75 = $80. The original price was $80.
Discount % = ((Original - Sale) / Original) × 100. If original price is $80 and sale price is $60: Discount = (($80 - $60) / $80) × 100 = 25%. You're getting 25% off.
Not necessarily. Compare final prices, not percentages. 50% off $30 ($15) is worse than 30% off $50 ($35 → $35 vs $15). Also consider quality, need, and whether you'd buy at full price. The best discount is on something you actually need.
Discount Results
Final Price
$75
You Save
$25
25.0% off