How to use the discount calculator
- Choose what you want to find with the buttons at the top: Sale price, % off or Original price.
- Enter the numbers. For the sale price, type the Original price and the Discount percentage. For the other modes, type the two prices, or the sale price and the percentage.
- Stack more discounts if you have them. Press Add another discount to add an extra percentage, such as a coupon on top of a sale. You can add up to four and remove any extra one with the cross button.
- Add tax if you need to. Turn on Add sales tax or GST after the discount and enter the Tax rate.
- Read the result. You see what you pay, how much you save, the total discount, and for stacked deals a step-by-step list of each reduction.
Features
- Three calculations in one: sale price from a discount, the percentage off from two prices, and the original price from a sale price.
- Stacked discounts of up to four percentages applied one after another, with the combined percentage and a plain explanation of why it is less than the simple sum.
- Optional sales tax, VAT or GST added on the discounted price, with the tax amount and final total.
- Instant answers as you type, with no button to press.
- Clear messages for empty fields, anything that isn't a number, percentages outside 0 to 100, or a sale price above the original.
- Accepts prices typed with thousands separators, like 12,499.99.
How stacked discounts really work
Shops love headlines like "extra 10% off sale prices". It sounds like the two discounts add up, but they don't. Each one is applied to whatever price is left after the one before it.
Take a pair of trainers at 6,000 with 30% off, plus a 15% app coupon. The first discount takes off 1,800, leaving 4,200. The coupon then takes 15% of 4,200, which is 630, so you pay 3,570. You save 2,430 in total, which is 40.5% of the original price, not the 45% you might expect.
The quick way to combine discounts is to multiply what you keep. 30% off keeps 70%, 15% off keeps 85%, and 0.70 × 0.85 = 0.595, so you pay 59.5% of the price and save 40.5%. The order doesn't matter: 15% then 30% gives exactly the same result.
Finding the real discount and the original price
Price tags don't always show a percentage. If a phone case was 1,200 and is now 899, choose % off to see that it is about 25.08% off. It is a quick way to compare deals across shops that advertise in different ways.
Going the other way is useful for receipts and budgeting. If you know you paid 2,250 after a 25% discount, the Original price mode tells you the full price was 3,000. Note that this only works for discounts below 100%, because at 100% off every item costs zero.
Why use Fileora's discount calculator
Discount sums are easy in theory and easy to get wrong at the checkout, especially with stacked coupons and tax on top. This calculator shows each step, so you can check a shop's maths as well as get the answer.
It's free, needs no account and works on any phone or computer. Everything happens on your device, so the prices you check stay private.
For other percentage questions, such as price rises or exam scores, try the percentage calculator. If you need to add or remove tax from a price, the GST calculator does both. Splitting a restaurant bill? The tip calculator works out the tip and each person's share.