How do I calculate percentage change?

(new − old) ÷ old × 100%. Going from 80 to 100 is (100-80)/80 = 25%.

What is the difference between percent and percentage points?

Percentage points are the absolute gap between two percentages: 3% rising to 5% is +2 percentage points, but a 66.7% increase.

How do I work out a discounted price?

Use “Increase / decrease by %” with the discount percentage — 20% off 300 gives 240.

How do I find the original price from the discounted one?

Use “Find the original value”: divide by the remaining percentage. If 80% of a price is 240, the original is 240 ÷ 80% = 300.

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％Percentage Calculator - Percent Of, Percent Change, Increase and Reverse

The five everyday percentage questions in one place: what is 15% of 200, 30 is what percent of 120, how much did 80 grow to reach 100, what is a price after an 8% rise, and what number has 30 as its 15%. Each answer comes with the formula.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use Percentage Calculator

1Pick the kind of percentage question
2Fill in the numbers
3Read the answer and copy the working if you need it

FAQ

How do I calculate percentage change?: (new − old) ÷ old × 100%. Going from 80 to 100 is (100-80)/80 = 25%.
What is the difference between percent and percentage points?: Percentage points are the absolute gap between two percentages: 3% rising to 5% is +2 percentage points, but a 66.7% increase.
How do I work out a discounted price?: Use “Increase / decrease by %” with the discount percentage — 20% off 300 gives 240.
How do I find the original price from the discounted one?: Use “Find the original value”: divide by the remaining percentage. If 80% of a price is 240, the original is 240 ÷ 80% = 300.