How to Use the Discount Calculator
Select the type of discount using the tabs above, enter the original price and discount value, and the final sale price appears instantly — no need to click a button.
- Single Discount — Enter one percentage discount and see the sale price, amount saved, and a visual savings bar.
- Stacked Discounts — Apply multiple discounts one after another (e.g. store-wide 20% off + extra 10% coupon). See each step broken down and the effective combined discount.
- Fixed Amount Off — Enter a specific dollar amount to deduct and see what percentage of the original price you save.
How Discounts Work
A percentage discount reduces the price by that fraction of the original. To calculate it: multiply the price by the discount percentage, divide by 100, and subtract from the original price.
For example, 25% off $80.00: $80 × 25 ÷ 100 = $20 saved. Final price: $80 − $20 = $60.00.
How Stacked Discounts Work
When multiple discounts are stacked, each one applies to the already-reduced price — not the original. This means stacking 20% + 10% is not the same as 30% off.
Example: $100 item with 20% off, then 10% off. Step 1: $100 × 0.80 = $80. Step 2: $80 × 0.90 = $72. The effective discount is 28%, not 30%.
Common Discount Examples
| Scenario | Original | Discount | Final Price |
|---|---|---|---|
| 10% off | $50.00 | 10% | $45.00 |
| 20% off | $80.00 | 20% | $64.00 |
| 25% off | $120.00 | 25% | $90.00 |
| 33% off | $60.00 | 33% | $40.20 |
| 50% off | $200.00 | 50% | $100.00 |
| 20% + 10% stacked | $100.00 | 28% effective | $72.00 |
| $15 off | $59.99 | $15.00 | $44.99 |
Frequently Asked Questions
How do I calculate a discount on a price?
Multiply the original price by the discount percentage divided by 100, then subtract that from the original price. For example, 20% off $80: $80 × 0.20 = $16 saved, final price $64.
What does stacking discounts mean?
Stacking discounts means applying multiple percentage discounts one after another. Each discount is applied to the reduced price, not the original. For example, 20% off then 10% off $100 gives $72, not $70.
Is 20% + 10% the same as 30% off?
No. When you stack 20% and 10%, each discount applies to the already-reduced price. 20% off $100 = $80, then 10% off $80 = $72. A straight 30% off $100 = $70. Stacked discounts always save less than simply adding the percentages.
How do I calculate the effective discount of stacked discounts?
The effective discount is: 1 − (1 − d1/100) × (1 − d2/100) × … expressed as a percentage. For 20% + 10%: 1 − (0.80 × 0.90) = 1 − 0.72 = 28%.
What is a fixed amount discount?
A fixed amount discount subtracts a specific dollar value from the price regardless of the original cost. For example, $15 off a $60 item gives a final price of $45, which is a 25% savings.
Does the order of stacked discounts matter?
Mathematically, the order does not change the final price — 20% then 10% gives the same result as 10% then 20%. However, seeing each step can help you understand how the price decreases at each stage.
Is this calculator free?
Yes, completely free with no signup required. All calculations happen in your browser — nothing is sent to a server.
Can I share my calculation?
Yes! The URL updates with your inputs automatically, so you can copy and share the link with anyone to show them the exact calculation.