Discount Calculator
See what you save and what you pay from any percentage off. Free, no signup, with the formula below.
How do I use the discount calculator?
- Enter the Original Price.
- Enter the Discount Percentage.
- Read You Save and Final Price.
Results update as you type, with a chart of saving versus price. Reset clears both fields.
What is the discount formula?
With P = original price and d = discount percentage:
- Savings = P × d ÷ 100
- Sale price = P × (1 − d ÷ 100), or P − savings
Worked example: an $80 item at 25% off.
- Savings = 80 × 25 ÷ 100 = $20.00
- Sale price = 80 × 0.75 = $60.00
The calculator shows You Save $20.00 (25.00% off) and Final Price $60.00.
| % off | You save | You pay |
|---|---|---|
| 10% | $8.00 | $72.00 |
| 20% | $16.00 | $64.00 |
| 25% | $20.00 | $60.00 |
| 30% | $24.00 | $56.00 |
| 50% | $40.00 | $40.00 |
How do you find the percent off from two prices?
This calculator needs the percentage. If you only know both prices:
Percent off = (original − sale) ÷ original × 100
Example: a price cut from $80 to $56 is (80 − 56) ÷ 80 × 100 = 30% off.
The percentage calculator does this too: its percentage change mode shows $80 to $56 as a 30% decrease.
Are two discounts the same as adding them?
No. The second discount comes off the reduced price.
On $100, 20% off leaves $80. Then 10% off $80 is $8, so you pay $72: 28% off in total, not 30%. The order doesn’t matter; 10% then 20% also gives 28%.
Combined % off = 100 × [1 − (1 − a ÷ 100) × (1 − b ÷ 100)]
| First | Then | Total off |
|---|---|---|
| 20% | 10% | 28% |
| 30% | 20% | 44% |
| 50% | 20% | 60% |
The calculator applies one discount at a time. For a stacked deal, run it twice, entering the first final price as the new original price.
Is the discount applied before or after sales tax?
It depends on the store and local tax rules, so check your receipt. When both are percentages, the order doesn’t change the total: for $80 at 25% off with 8% tax, 80 × 0.75 × 1.08 and 80 × 1.08 × 0.75 both equal $64.80. Fixed-amount coupons can work differently.
This calculator doesn’t include tax. To add it to the final price, use the sales tax calculator.
Discount calculator FAQs
How do I calculate 20% off?
Multiply the price by 20 and divide by 100 to get the saving, then subtract it. For a $45 item, 45 × 20 ÷ 100 = $9.00 off, so you pay $36.00. As a shortcut, multiply by 0.8, because paying 80% of the price is the same as 20% off.
How do I find the original price from the sale price?
Divide the sale price by (1 − discount ÷ 100). If an item costs $60 after 25% off, the original was 60 ÷ 0.75 = $80.00. The calculator only works forward, but you can check: enter $80 and 25%, and it shows a final price of $60.00.
Is 50% off then 20% off the same as 70% off?
No. The 20% comes off the price that’s already been halved. On a $100 item, 50% off leaves $50, and 20% off $50 is $10, so you pay $40. That’s 60% off in total, not 70%. Two stacked discounts always come to less than their simple sum.
Is the discount taken before or after tax?
It depends on the store and local tax rules, so check your receipt. When the discount and the tax are both percentages, the order doesn’t change what you pay: 25% off and 8% tax on $80 comes to $64.80 either way. Fixed-amount coupons can be treated differently.
To compare two offers side by side, use the comparison calculator.