Discount Calculator
Calculate how much you save with any discount. Enter the original price and discount percentage to see the sale price instantly. Supports stacked discounts and sales tax.
Free online tool - no sign-up required
Calculate Your Discount
Enter the item's original price before discount
Enter the discount percentage (e.g., 25 for 25% off)
For stacked discounts (e.g., extra 10% off sale)
Enter your local sales tax rate
Quick Discount Reference
| Discount | $25 Item | $50 Item | $100 Item | $200 Item |
|---|---|---|---|---|
| 10% off | $22.50 | $45.00 | $90.00 | $180.00 |
| 15% off | $21.25 | $42.50 | $85.00 | $170.00 |
| 20% off | $20.00 | $40.00 | $80.00 | $160.00 |
| 25% off | $18.75 | $37.50 | $75.00 | $150.00 |
| 30% off | $17.50 | $35.00 | $70.00 | $140.00 |
| 40% off | $15.00 | $30.00 | $60.00 | $120.00 |
| 50% off | $12.50 | $25.00 | $50.00 | $100.00 |
| 75% off | $6.25 | $12.50 | $25.00 | $50.00 |
Sale prices shown before tax
How to Use This Discount Calculator
Enter Price and Discount
Type the original price of the item and enter the discount percentage. Use the quick buttons for common discount amounts like 10%, 20%, or 50% off.
Add Stacked Discounts or Tax
Optionally enter a second discount percentage for stacked deals (e.g., extra 10% off clearance). Add your local sales tax rate to see the total out-of-pocket cost.
View Your Savings
See the discount amount, final price, total savings, and a detailed breakdown. Compare the effective discount when stacking multiple discounts.
How Discount Calculation Works
Sale Price = Original Price x (1 - Discount / 100)A discount reduces the original price by a percentage. The sale price is what remains after subtracting the discount amount from the original price.
Discount Amount = Original Price x (Discount% / 100)Sale Price = Original Price - Discount AmountStacked Price = Sale Price x (1 - Second Discount% / 100)Final Price = Stacked Price + (Stacked Price x Tax% / 100)Key points about discount calculations:
- Single discount is straightforward: multiply price by (1 - rate) to get the sale price
- Stacked discounts are applied sequentially - the second discount applies to the already-reduced price, not the original
- Two 20% discounts do not equal 40% off. They equal 36% off (100 x 0.8 x 0.8 = 64, saving 36%)
- Sales tax is calculated on the final discounted price, reducing your total tax obligation
Understanding stacked discounts is especially useful during sales events where stores offer an additional percentage off already marked-down items.
Frequently Asked Questions
How do I calculate a discount percentage?
Multiply the original price by the discount percentage divided by 100. For example, a 25% discount on a $80 item: $80 x (25 / 100) = $20 discount. The sale price is $80 - $20 = $60.
What are stacked discounts and how do they work?
Stacked discounts apply sequentially, not additively. A 20% discount followed by an additional 10% discount does NOT equal 30% off. Instead, the second discount is applied to the already-reduced price. For example, $100 with 20% off = $80, then 10% off $80 = $72. The effective total discount is 28%, not 30%.
Is sales tax calculated before or after the discount?
Sales tax is calculated after all discounts have been applied. You pay tax on the discounted price, not the original price. This means discounts also reduce the amount of tax you owe.
How do I find the original price from a sale price?
To reverse-calculate the original price, divide the sale price by (1 minus the discount rate). For example, if an item costs $60 after a 25% discount: $60 / (1 - 0.25) = $60 / 0.75 = $80 original price.
What is the difference between percentage off and dollars off?
A percentage discount scales with the price (20% off a $50 item saves $10, but 20% off a $200 item saves $40). A fixed dollar discount (like $10 off) saves the same amount regardless of price. Percentage discounts are better on expensive items, while fixed discounts may be better on cheaper items.
Important Disclaimer
This calculator provides estimated discount savings for informational purposes only. Actual prices may vary due to rounding, store policies, coupon restrictions, or additional fees. Sales tax rates vary by location and product type. Always verify the final price at checkout. This tool does not constitute financial or shopping advice.