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About

Discount Calculator

Type the price and the discount, with its minus sign, and the sale price appears with the arithmetic under it: 80 less 25% is 60. Fill in a different pair of boxes for the other two questions, how much was taken off in percent or what the price was before the sale. All three are one sentence: “From 80 to 60 is a change of −25%”.

What it does

  • The percent off from two prices: 80 down to 60 is −25%, worked as (60 − 80) ÷ 80 × 100.
  • Two discounts in a row multiply: 20% off and then 10% off is 28% off, not 30%.
  • Prices are worked out exactly: 15% off 19.99 is 16.9915, left for you to round as the shop does.
  • A discount typed without its minus sign is read as a rise, and the note says so: 80 and 25% give 100.
  • Sales tax added afterwards is a second sentence: 60 plus 8% is 64.8.

How to use it

  1. Type the full price in the first box.
  2. Type the discount in the third box with a minus sign, as −25.
  3. Read the sale price and the working under it.
  4. For the percent off, type the sale price over the answer; on a phone, tap ? beside the percent first.

What it does not do

  • Rounding to the cent: a shop may round up, round down or round each item before adding, so the exact figure is left to you.
  • A coupon worth a fixed amount: $10 off is a subtraction, though typing both prices then says what percent it was.

Questions

How do I work out a discount by hand?

Multiply the price by what the discount leaves: 25% off leaves 75%, so 80 × 0.75 = 60, and the saving is the difference, 20. The window writes the same sum as 80 × (1 − 0.25).

Is 20% off and then 10% off the same as 30% off?

No, it is 28% off. The second discount comes off the price already cut: 80 less 20% is 64, and 64 less 10% is 57.60, which is 28% below 80. Type 57.6 over the sale price, with 80 as the price, to see it.

What did it cost before the sale?

Type the sale price in the second box and the discount in the third, and the first box, the one left alone, is worked out: 60 after 25% off was 80. On a phone, tap ? beside From. Adding 25% to 60 gives 75, the usual mistake, and the answer names it.

Why type the discount as a minus number?

The sentence measures a change, and a discount is a fall. A cut of 25% is −25; typed as 25, the same sentence gives the price after a 25% rise, 100, and the note under it calls it a rise.

Everything here runs in your browser. Nothing you type, paste or open is uploaded, and there is no account and no queue. How that works.

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