Free Online Discount Calculator
Runs 100% in your browser — your numbers never leave your device.
Final price after discounts + tax
What percent off is this?
About this discount calculator
Sale math is designed to confuse: "20% off plus an extra 10% off" sounds like 30% off, but the second discount applies to the already-reduced price, so you actually save 28%. This calculator applies discounts in sequence exactly the way a checkout till does, then adds sales tax on the discounted price.
The second box answers the reverse question — "was $80, now $60, what percent off?" — useful for checking whether a "sale" is really a deal, and for reconstructing the original price from a sale price (divide the sale price by 1 minus the discount).
Worked examples
A simple sale. A $129.99 gadget at 25% off costs 129.99 × 0.75 = $97.49, and you save $32.50. Enter 129.99 and 25 in the first box and the calculator shows all three figures: final price, savings and effective discount.
Stacked discounts. A $59.99 jacket has a 30% coupon plus an extra 20% taken at the till. The discounts apply in sequence: 59.99 × 0.70 × 0.80 = $33.59. That is an effective discount of about 44% — not the 50% it feels like. Enter both discounts and the calculator does the sequence for you, so you see the real number before you buy.
Adding tax. After those discounts the jacket is $33.59 at the shelf; with 8% sales tax the checkout total is 33.59 × 1.08 = $36.28. (Or the simpler textbook case: $72 plus 8% tax = $77.76.) Tax always applies to the discounted price here, matching how stores ring you up.
Checking a sale label. A tag says "was $80, now $60". The second box tells you that is 25% off and you save $20 — and if you only know the sale price and the discount, you can work backwards: a $72 item at 28% off was 72 ÷ 0.72 = $100 originally. Handy when a retailer hides the original price.
Who uses a discount calculator
Bargain hunters sanity-check Black Friday and clearance labels — "up to 70% off" on the banner rarely means 70% off your item. Resellers verify their margin: buy at the sale price, add tax and fees, and confirm the resale still profits. Small shop owners use the reverse direction when pricing a sale: pick the sale price customers will see, then confirm the discount percentage it implies. Travellers shopping abroad convert a foreign price, apply the local discount, and add local tax to get the true cost in one pass. And anyone staring at a "20% off plus extra 10%" sign uses it to find the number the marketing is hiding.
How to use
- Enter the original price, one or two discounts, and optional sales tax.
- Press Calculate to see the final price, total savings and effective discount.
- Use the second box to convert any original/sale pair into a percent-off figure.
Limitations
- Money is rounded to cents; tiny fractions of a cent are lost, as at a real till.
- Tax rules vary by place — some regions tax the pre-discount price. This calculator follows the common post-discount convention.
- Coupons with fixed dollar amounts aren't covered; subtract those from the price first.
- Percentage discounts commute: 20% then 10% gives the same result as 10% then 20% — the order you enter them in does not matter.
- Rounding happens once after discounts and once after tax, so hand maths that keeps full precision can differ from the result by a cent.
Frequently asked questions
Why don't stacked discounts add up to their sum?
Because each discount applies to the already-reduced price. A 20% discount followed by 10% gives 0.80 × 0.90 = 0.72, i.e. 28% off — not 30%.
Is sales tax applied before or after the discount?
After. Tax is calculated on the discounted price at checkout, so this calculator applies discounts first and tax second.
How do I find the original price from a sale price?
Divide the sale price by (1 − discount). A $72 item at 28% off was 72 ÷ 0.72 = $100 originally.
How are prices rounded?
All money results are rounded to the nearest cent (two decimal places), standard for currency.
Is my data uploaded anywhere?
No. The calculator runs 100% in your browser with JavaScript. Your numbers never leave your device, are never stored, and never sent to any server.
What is 25% off $129.99?
$97.49. Multiply the price by (1 − 0.25): 129.99 × 0.75 = 97.49, so you save $32.50. Enter the same figures in the first box and the calculator shows the final price, your savings and the effective discount together.
Does the order of stacked discounts matter?
No. Percentage discounts multiply, and multiplication does not care about order: 20% then 10% is 0.80 × 0.90 = 0.72, exactly the same as 10% then 20%. Either way the effective discount is 28%. Enter them in any order.
Why is the total a cent different from my own calculation?
Because the calculator rounds to cents once after applying the discounts and once again after adding tax — exactly like a till. If your hand maths carries full precision through every step, the last cent can differ. The calculator's figure is the one a checkout would show.
Can I enter a discount over 100% or a negative price?
No. Discounts must be between 0 and 100, and prices cannot be negative — the calculator shows an error otherwise. A 100% discount makes the item free; anything beyond that is not a discount.