A sale tag that says “25% off” sounds simple, but the price you actually pay is not always obvious — especially when a store adds a second discount at checkout, or sales tax on top.
This discount calculator does the working for you. Enter the original price and the discount, add a second stacked discount or tax if they apply, and see the final price and your total saving straight away. More everyday money tools are on our finance calculators hub.
Discount Calculator
Enter the original price and a discount percentage to see the sale price, how much you save, and — if you add tax — the total you will actually pay.
Your discount results
What Is a Discount Calculator?
A discount calculator works out the sale price of an item after a percentage is taken off. You give it the original price and the discount percentage, and it gives you back the reduced price and the amount you save in dollars.
That is useful for sales, coupons, clearance offers, and promo codes. Instead of guessing what “30% off $80” means, you get an exact answer: $56, with $24 saved. It also handles two discounts in a row and tax added after the discount, which are easy to get wrong by hand.
How Does a Discount Calculator Work?
The calculator takes a percentage off the price, one discount at a time. If you need a refresher on percentages themselves, our percentage calculator covers the basics.
For a single discount, the formula is:
Price after discount = original price × (1 − discount % ÷ 100)
Original price is the full price before any discount. Discount % is the percentage taken off, such as 25. At 25% off, you pay 75% of the original price.
With a second, stacked discount, the same formula runs again on the new, lower price:
Final price = price after first discount × (1 − second discount % ÷ 100)
Tax, if you enter it, comes last:
Total to pay = final price + (final price × tax % ÷ 100)
This order matters. Discounts reduce the price first, and tax is charged on the discounted price, not the original.
How to Use the Discount Calculator
- Enter the original price in dollars.
- Enter the discount percentage — for example, 25 for 25% off.
- If there is a second discount, such as an extra coupon at checkout, enter it in the second discount box. It will be applied after the first discount. Leave it blank if there is only one discount.
- If you want tax included, enter the sales tax percentage. It will be applied to the discounted price. Leave it blank to skip tax.
- Click Calculate and read the price after the first discount, the final price, and how much you save.
- If tax was entered, also check the tax amount and the total to pay. To start over, click Reset.
Worked Example
Suppose an item costs $80 and the store offers 25% off.
Step 1 — first discount: $80 × (1 − 25 ÷ 100) = $80 × 0.75 = $60.00. You save $80 − $60 = $20.00.
Now suppose you also have a coupon for an extra 10% off at checkout.
Step 2 — second discount: $60.00 × (1 − 10 ÷ 100) = $60.00 × 0.90 = $54.00. Your total saving is $80 − $54 = $26.00.
That $26 saving is 32.5% effective off ($26 ÷ $80), not 35%. Stacked discounts do not simply add up, because the second 10% is taken off $60, not the original $80. Ten percent of $60 is only $6, not $8 — so the combined saving is smaller than 25% + 10% would suggest.
Sale Prices at Common Discounts
The table shows the sale price — before tax — for four common starting prices at four common discount levels. Use it for a quick check without calculating.
| Original Price | 10% Off | 20% Off | 25% Off | 50% Off |
|---|---|---|---|---|
| $50 | $45.00 | $40.00 | $37.50 | $25.00 |
| $80 | $72.00 | $64.00 | $60.00 | $40.00 |
| $100 | $90.00 | $80.00 | $75.00 | $50.00 |
| $200 | $180.00 | $160.00 | $150.00 | $100.00 |
Checking the dollar amount, not just the percentage, is always worthwhile.
Important Points & Assumptions
This calculator assumes discounts are percentages off the price, applied in the order you enter them: first discount, then second discount, then tax. That matches how most stores work, but check the offer terms — some coupons exclude sale items.
It assumes tax is charged on the discounted price, the usual rule in most U.S. states. Results are rounded to the nearest cent. Shipping, fees, and minimum-spend conditions are not included, and the calculator does not judge whether a “sale” price is genuinely good value — only what the maths gives.
Common Mistakes
The biggest mistake is adding stacked percentages together. As the worked example shows, 25% off followed by 10% off is 32.5% off in total, not 35%, because the second discount applies to a smaller price.
Another mistake is applying tax before the discount. Tax should be worked out on the discounted price. Adding tax to the original price first overstates what you will pay.
People also confuse “percent off” with “percent of the price.” At 25% off, you pay 75% of the price — if you calculate 25% of the price and treat that as the sale price, you have found the saving, not the price.
Finally, watch the reference price. A large percentage off an inflated “was” price may be worse than a smaller discount elsewhere — the same care you would use with our tip calculator when checking what a percentage comes to in dollars.
How to Interpret Your Results
Start with the final price: what the item costs after all discounts, before tax. Compare it with prices elsewhere, not just with the original tag.
The amount saved is your saving in dollars, and the effective percentage is your true combined discount when two discounts are stacked. Use it to compare offers fairly — a single 30% discount beats 25% plus 10%.
If you entered tax, the total to pay is the checkout figure to budget for. If you are paying cash, our money counting calculator can help you check the bills and coins you hand over.
Frequently Asked Questions
How do I calculate a discount by hand?
Multiply the price by the discount percentage divided by 100 to find the saving, then subtract it. For example, 25% of $80 is $20, so the sale price is $80 − $20 = $60.
Do stacked discounts add up?
No. Each discount applies to the price left after the previous one, so 25% off followed by 10% off gives 32.5% off in total, not 35%.
Is tax calculated before or after a discount?
Usually after. Sales tax is normally charged on the discounted price you actually pay, and this calculator applies tax last.
What does 100% off mean?
The final price is $0.00 — the item is free before any tax or fees. The calculator accepts 100% as a valid discount.
How do I find the effective percentage off with two discounts?
Divide your total saving by the original price and multiply by 100. Saving $26 on an $80 item is $26 ÷ $80 × 100 = 32.5% effective off.
Can I use this calculator for coupons and promo codes?
Yes. Enter a store discount as the first discount and a coupon percentage as the second. Check the coupon terms, as some exclude sale items.
References
For guidance on how sale prices and price comparisons should be advertised, see the Federal Trade Commission (FTC) guides for the use of pricing and retail price comparisons at www.ftc.gov.
Disclaimer: This calculator and article provide general information only and are not financial advice. Store policies on discounts, coupons, and tax vary, so check the terms of any offer and your local tax rules before relying on a result.