Discount Calculator
Calculate the sale price and amount saved after a percentage discount.
What you enter and what comes back
Enter the original price and the discount percentage. The calculator returns two figures:
- You save:
price × discount ÷ 100 - Final price: the original price minus the saving
The defaults, $100 at 25% off, give a final price of $75 and a saving of $25. A less tidy example: $34.99 at 15% off comes to $29.74, saving $5.25. Results are rounded to the cent, and a final zero is left off: a $12.50 saving reads $12.5.
Why the two lines can add up to a cent more
Each line is rounded to the nearest cent on its own. When the exact answer ends in half a cent, both can round up. $129 at 12.5% off is exactly $112.875 to pay and $16.125 saved. The calculator shows $112.88 and $16.13, which together make $129.01. At the register you pay one rounded figure, $112.88 or $112.87 depending on how the store rounds.
The same thing happens when a discount is applied per item rather than to the whole order. Three items at $19.99 with 20% off:
- per item: $15.992 rounds to $15.99, so three cost $47.97;
- on the order total of $59.97: $47.98.
A one-cent gap like this on a receipt is rounding, not an error.
Volume discounts and early-payment terms
Ordering more to reach a discount tier. Say a supplier charges $12 a unit and offers 10% off orders of 50 or more. You need 45. Without the discount, 45 units cost $540. With it, 50 units cost $600 less 10%, which is also $540. The five extra units are free, so the larger order wins if you can use or store them.
Paying an invoice early. An invoice for $2,400 that offers 2% off for paying in 10 days instead of 30 comes to $2,352, a $48 saving. You're paying 20 days early to save 2%. As an annual rate that's about 37.24% (2 ÷ 98 × 365 ÷ 20). Compare it with what that cash earns elsewhere, or what borrowing it would cost you.
Entries the calculator doesn't block
- Over 100%: $100 at 110% off shows a final price of $-10. No real discount works like that, so check for a typo.
- Negative discounts: $100 at −10% gives a final price of $110 and a saving of $-10. You can use this deliberately to add a surcharge or a price increase.
- Decimal percentages such as 12.5% or 33.3% are used exactly as typed.
Frequently asked questions
Can I take a discount off a price that already includes tax?+
Yes, and the result is the same as discounting first and adding tax after, because percentages multiply. $100 with 8% tax is $108, and 25% off that is $81. Taking 25% off first gives $75, and adding 8% tax also gives $81.
What is the difference between a discount, a markdown and a rebate?+
A discount is a reduction you get at the point of sale, often for a reason such as a coupon or a bulk order. A markdown is the seller permanently lowering the ticket price. A rebate is money returned after you've paid full price, usually once you've sent in a claim, so it doesn't lower what you pay at the register.
Does the dollar sign mean it only works for dollars?+
No. The sign is only a label. The arithmetic is the same in any currency, so enter a price in euros, pounds or rupees and read the results in that currency.
Embed this tool on your website
Free to use on blogs, school sites and intranets. Paste this code into your page's HTML; please keep the credit line.
<iframe src="https://utilityapp.lat/embed/math/discount-calculator" title="Discount Calculator" width="100%" height="660" style="border:0;max-width:760px" loading="lazy"></iframe> <p style="font-size:13px"><a href="https://utilityapp.lat/math/discount-calculator">Discount Calculator</a> by UtilityApp</p>