Discount Calculator — Sale Price & Savings
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Free Discount Calculator — Sale Price, Savings & Percent Off
Four modes in one: find the sale price after a discount, calculate your savings, find the discount percentage between two prices, or stack two discounts together. Formula shown every time. No sign-up, no ads, 100% free.
🏷️ What is the sale price after discount?
How to Use This Discount Calculator
Choose the tab that matches your question — all four modes give instant results as you type.
- Mode 1 — Sale Price: Know the original price and discount %? Find what you actually pay, how much you save, and optionally add sales tax.
- Mode 2 — Find Discount %: Know both original and sale price? Find out what percentage discount was applied.
- Mode 3 — Original Price: Know the sale price and discount %? Work backwards to find the original price before the deal.
- Mode 4 — Stacked Discounts: Have two discounts applied together (e.g. 20% sale + extra 10% coupon)? Find the true effective discount and final price.
Discount Formulas — Explained Simply
Formula 1: Sale Price After Discount
Sale Price = Original Price × (1 − Discount% ÷ 100)
Example: Jacket costs $120, 25% off. Sale Price = 120 × 0.75 = $90. You save $30.
Formula 2: Discount Percentage
Discount% = [(Original − Sale) ÷ Original] × 100
Example: Was $200, now $150. Discount% = [(200−150)÷200] × 100 = 25%.
Formula 3: Original Price Before Discount
Original = Sale Price ÷ (1 − Discount% ÷ 100)
Example: Sale $75, discount 25%. Original = 75 ÷ 0.75 = $100.
Formula 4: Stacked Discounts
Effective% = [1 − (1−D1÷100) × (1−D2÷100)] × 100
Example: 20% off then 10% coupon. Effective = [1 − 0.80 × 0.90] × 100 = [1 − 0.72] × 100 = 28% off — NOT 30%.
The second discount always applies to the already-reduced price, not the original. This is why two stacked discounts always produce less than their sum.
Common Discount Reference Table
| Discount | You Pay | $100 item | $250 item | $500 item |
|---|---|---|---|---|
| 5% off | 95% | $95.00 | $237.50 | $475.00 |
| 10% off | 90% | $90.00 | $225.00 | $450.00 |
| 15% off | 85% | $85.00 | $212.50 | $425.00 |
| 20% off | 80% | $80.00 | $200.00 | $400.00 |
| 25% off | 75% | $75.00 | $187.50 | $375.00 |
| 30% off | 70% | $70.00 | $175.00 | $350.00 |
| 40% off | 60% | $60.00 | $150.00 | $300.00 |
| 50% off | 50% | $50.00 | $125.00 | $250.00 |
| 70% off | 30% | $30.00 | $75.00 | $150.00 |
| 75% off | 25% | $25.00 | $62.50 | $125.00 |
Real-World Discount Examples
Original: $120 | Discount: 30%
Sale = 120 × 0.70 = $84.00
You save $36.00
Original: $999 | Discount: 20%
Sale = 999 × 0.80 = $799.20
You save $199.80
Original: $500 | 25% + 10% coupon
Effective = 32.5% | Final = $337.50
NOT 35% off — stacking!
Sale Price: $60 | Discount: 40%
Original = 60 ÷ 0.60 = $100.00
Saved $40 total
⚠️ Watch Out for Fake Discounts
A fake discount is when a retailer artificially inflates the "original price" to make the discount look larger than it really is. A product priced at $30 all year gets listed as "Was $100, now $30 — 70% off!" before a sale.
Use Mode 2 of this calculator to verify: enter what the retailer claims was the original price and the sale price. If the discount % seems too good to be true — it probably is. Always compare with the product's price on other platforms before buying.
Frequently Asked Questions
How do I calculate 20% off a price?
Multiply the original price by 0.80. Example: 20% off $150 = 150 × 0.80 = $120. You save $30. Or use Mode 1 above — enter the price and 20 in the discount field for an instant result.
Are two stacked discounts the same as adding them?
No — and this is one of the most common discount misconceptions. A 20% discount followed by a 10% coupon is NOT 30% off. The second discount applies to the already-reduced price: $100 → 20% off = $80 → 10% off = $72. Effective discount = 28%, not 30%. Use Mode 4 to calculate stacked discounts correctly.
How do I find the original price before a discount?
Use Mode 3. Enter the sale price and the discount percentage — the calculator finds the original price instantly. Formula: Original = Sale Price ÷ (1 − Discount% ÷ 100). Example: sale price $75, 25% off → original = 75 ÷ 0.75 = $100.
What is the difference between discount and cashback?
A discount reduces the price you pay at checkout. Cashback returns a percentage of the amount paid to you after the purchase — usually as store credit, points, or a bank transfer. Both save money, but a discount lowers your immediate out-of-pocket cost while cashback is received later.
Does this calculator work with any currency?
Yes. The $ sign is just a label. Enter amounts in rupees, euros, pounds, dirhams, or any other currency — the math is identical and the results work for any currency.
How does sales tax affect the final price?
Sales tax is applied after the discount. Use Mode 1 and enter your local tax rate in the "Sales Tax" field. Formula: Final with tax = Sale Price × (1 + Tax% ÷ 100). Example: $90 sale price with 8.5% tax = 90 × 1.085 = $97.65.
How can I mentally calculate a discount quickly?
10% off: Move decimal point one place left (10% of $80 = $8). 20% off: Find 10% then double it. 25% off: Divide by 4. 50% off: Divide by 2. 15% off: Find 10% + 5% (half of 10%) and add them. These shortcuts work for quick estimates when shopping.
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