Discount Calculator
Find the final price after a percentage discount and an optional flat coupon, with your total savings shown clearly.
Discount Calculator — input your values
What does this everyday calculator do?
The discount calculator applies a percentage discount to an original price, then optionally subtracts a flat coupon amount, giving you the final price, total savings and savings percentage.
A bar chart compares the original and final prices at a glance, and the step-by-step math shows the order of operations: percentage first, coupon second, then the savings total.
Formula and variables
The coupon applies after the percentage discount, which is how most store promotions work.
| Symbol | Meaning |
|---|---|
| Discount amount | original price × discount percentage ÷ 100 |
| After discount | original price − discount amount |
| Total savings | original price − final price |
Worked example
A jacket costs $120 and is 25% off, with an additional $10 coupon.
- Discount = $120.00 × 0.25 = $30.00.
- After discount: $120.00 − $30.00 = $90.00.
- Final = $90.00 − $10.00 = $80.00, saving $40.00 (33.33%).
Answer: The jacket costs $80.00 after the discount and coupon.
Tips and common mistakes
Tips
- A '50% + 20% off' tag is not 70% off: the second discount applies to the reduced price, making the total about 60% off.
- Compare the final price per unit when buying in bulk — bigger packages are not always the better deal.
- Check whether the coupon applies before or after tax; a coupon that applies before tax saves you more in sales tax.
- If you have both a percentage coupon and a fixed amount, run both orders to see which arrangement saves more.
Common mistakes to avoid
- Adding discount percentages together: two sequential discounts never equal their sum.
- Forgetting that a coupon larger than the discounted price cannot go below zero.
- Comparing the discounted price to the original including tax, which makes the savings look larger than they are.
Discount Calculator — frequently asked questions
How do I calculate a discount?
Multiply the original price by the discount percentage divided by 100, then subtract that from the original price. A 25% discount on $80 is $80 − $20 = $60.
What is the formula for the sale price?
Sale price = original price × (1 − discount percentage ÷ 100). For a 30% discount, multiply by 0.70.
How do I find the discount percentage?
Divide the savings by the original price and multiply by 100. Saving $20 on a $100 item is a 20% discount.
Do I apply the coupon before or after the percentage discount?
This calculator applies the percentage first, then the coupon. Applying a fixed coupon first and the percentage second can sometimes save more — test both orders.
Can the final price be negative?
No. The final price is clamped at zero, so a coupon larger than the discounted price simply makes the item free.
What is the difference between discount and savings?
Discount is the percentage reduction, while savings is the actual money kept — original price minus what you pay, including any coupon.