Percentage Calculator

Instant percentage calculations with formula breakdowns: percentage of a number, percentage increase/decrease, and ratios.

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1. Percentage of a Number

What is X % of Y?

What is % of =
18
Formula: (X / 100) × Y

2. Percentage Ratio

X is what percent of Y?

is what % of =
20 %
Formula: (X / Y) × 100

3. Percentage Increase / Decrease

Percentage change from value X to Y

From to =
+25 % (Increase)
Formula: ((Y - X) / X) × 100

How to Calculate Percentages in Everyday Life

Percentages represent fractions out of 100 and are commonly used for calculating discounts, sales taxes, tips at restaurants, and investment returns.

Real-World Percentage Examples

Frequently Asked Questions

Mathematically, calculating a percentage increase from zero is undefined because division by zero is impossible. The initial number must be non-zero.
Yes! You can enter negative values to calculate changes involving financial deficits or negative temperatures.
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Frequently asked questions

What does Percentage Calculator do?

Calculate percentage of a number, percentage increase/decrease, fractions, and percentage difference instantly. Free, reactive online percentage calculator.

How do I use Percentage Calculator?

Open Percentage Calculator, enter or select the input requested by the tool, and use its controls to see the result.

Where can I find tools related to Percentage Calculator?

Use the related tools below to explore more Calculators & Math tools.

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