Percentage calculator

Four quick percentage calculators on one page: percent of a number, what percent one number is of another, percent change, and discounts.

How it works

  1. Each box is a separate calculator: fill in the numbers and the result appears instantly.
  2. Two successive discounts are not added together: the second applies to the already reduced price.

Questions

Why is 20% off then 10% off not 30% off?

Because the second discount applies to the reduced price. 100 → 80 → 72, a total reduction of 28%.

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