Discount Calculator
Sale price after percentages and a fixed coupon in the order you choose, the percent off between two prices, or the original price — plus quantity and tax.
Sale price after a discount
Final price: 80 You save: 20
Find the discount %
Discount: 20%
Find the original price
Original price: 100 You save: 30
Plain numbers, no currency.
All three directions of the same sum
A discount has three questions and this page answers all of them. Enter an original price and a percentage to see the sale price and what you save. Enter an original and a sale price to get the percentage between them. Or enter what you paid and the percentage that was advertised, and the third section works back to the list price — the question anybody standing in front of a ticket saying 70, was 30% off, is actually asking.
Stacked discounts, and why they are less than they look
Extra percentages typed into the second box are applied one after another to the running price, which is how stacked coupons actually work. 20% and then a further 10% is 28% off, not 30%, because the second coupon comes off a price the first one has already reduced. The page shows the effective discount so the difference is visible rather than assumed, and ticking "Show the working" puts the sums with your own numbers under each answer — each discount taken off in turn, the till, the percentage and the original price.
A coupon and a percentage: the order changes the price
A coupon that takes a fixed amount off goes in its own box, and you choose whether it comes off before or after the percentages. Once an amount is in the mix the order matters: 10,000 with 10% off and then a 1,000 coupon is 8,000, but the coupon first and then 10% off is 8,100, because the percentage is then taken from a smaller price. The page shows the price in the order you picked, what the other order would give and the difference. Which order applies is the shop’s rule, not the calculator’s. The coupon comes off each item, before the quantity multiplies, and it never takes the price below 0. With two or more steps the page also lists each one in a table — what it took off and the price after it.
What it costs at the till
Set how many you are buying and a tax rate and the page adds a subtotal, the tax and the total to pay, in that order: every discount first, then the quantity, then tax on the discounted amount — the order shops usually ring it up in. With percentages alone the order makes no difference; with a fixed coupon, taxing the discounted amount gives the smaller total. Those lines stay hidden while you are buying one of something with no tax. Everything is plain numbers with no currency, so read the results in whatever units you entered; displayed figures are rounded to two decimals while the calculation underneath keeps full precision.
Frequently asked questions
How is the final price calculated?
Final price = original price − (original price × discount ÷ 100). The amount saved is original price × discount ÷ 100. Extra percentages are then applied one at a time to the running price rather than added together.
It says 70 and 30% off — what was the original price?
That is the third section: original = paid ÷ (1 − discount ÷ 100), so 70 at 30% off was 100. At 100% off or more there is no single answer, because every list price ends at the same place, and the page says so rather than showing a number.
How do I find the discount percentage from two prices?
Use the second section. Discount % = (original − final) ÷ original × 100. If the original price is zero the percentage is undefined, so the tool shows a short notice instead.
Why is 20% off then 10% off not 30% off?
Because the second discount comes off a price the first one already reduced. 100 becomes 80, and 10% of 80 is 8, so you pay 72 — 28% off in total. The effective discount line spells this out whenever you stack percentages.
Does it handle quantity and tax?
Yes. Fill in how many and a tax rate and you get a subtotal, the tax and the total to pay. Discounts come off first, then the quantity multiplies, then tax is added to the discounted amount.
Can I see how the answer was worked out?
Yes. Tick "Show the working" and each answer carries the sums with your own numbers: one discount as price × percentage and price − saving, stacked ones taken off one after another with the overall figure, the till’s quantity, tax and total, and the sums behind the percentage and the original price. It is off by default.
Does it matter whether the coupon or the percentage comes first?
Yes, once the coupon is a fixed amount. 10,000 with 10% off and then a 1,000 coupon is 8,000; the coupon first and then 10% off is 8,100, because the percentage comes off a smaller price. Pick the order in the coupon order box and the page shows both prices and the difference. Which order applies is up to the shop’s rules.