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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% |
Adjust Discount
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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
How do I calculate a discount?
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.
How do stacked discounts work?
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).
How do I find the original price before 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.
How do I find the discount percentage?
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.
Is a bigger percentage always a better deal?
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.
How this works
Calculations are run entirely in your browser. No inputs are sent to our servers and no account is required. Formulas follow standard US definitions from the IRS and the CFPB where applicable; international users should confirm local tax and regulatory rules apply.
What this tool can’t do
When to consult a professional
This is a software engineering tool, not financial advice. Run the math here, then take the result to a certified financial planner, CPA, or your bank before making a decision that materially affects your money.
Sources
- [1]Consumer Financial Protection Bureau (CFPB)Official sourceconsumerfinance.govAccessed Apr 21, 2026
US consumer finance regulator; authoritative on mortgage disclosures, APR rules, credit cards.
Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).