折扣计算器

A discount calculator for sales and special offers. Enter a price and a percentage to see the final price and how much you save, or compare an original and a sale price to find the percentage off.

The two modes answer the two questions shoppers actually have: what will I pay after this discount, and is the deal advertised really as big as it claims?

To apply a percentage discount, the original price is multiplied by the percentage and divided by 100 to get the saving, which is then subtracted from the original for the final price.

To find the percentage from two prices, the calculator subtracts the sale price from the original, divides by the original and multiplies by 100. That tells you the true discount on a 'was X, now Y' label.

Stacked discounts are a common trap: a 20 percent then 10 percent offer is not 30 percent off, because the second discount applies to the already-reduced price, giving 28 percent in total. Apply them one after another, not by adding.

It works on the price you enter, so if that price already includes VAT the result includes VAT too, since a percentage discount applies the same way to gross and net prices. Everything runs in your browser.