Calculators/Financial & Everyday

Percentage Calculator

Quickly find percentage increase, decrease, marks percentage, and discounts.

%
20% of 500 =100

About Percentage Math

A percentage represents a fraction of 100 (“per cent” = per hundred). It is universally used in finance, discounts, taxes, academic grades, scientific statistics, and everyday shopping.

This calculator provides dedicated modes for common questions: calculating a percentage of a quantity, determining the percentage share between two numbers, measuring percentage growth or drop, and applying percentage markups or discounts.

Percentage Formulas

What is X% of Y?

Result = (X × Y) / 100

X is what % of Y?

Result = (X / Y) × 100

Percentage Change:

Change = ((New - Old) / Old) × 100

Increase / Decrease by X%:

Result = Value × (1 ± X / 100)

How to Use the Percentage Calculator

1

Choose the percentage calculation type from the mode tabs above.

2

Enter your values in the respective numeric input fields.

3

View the instant result, formula breakdown, and copy with one click.

Available on Android

Need More Tools on Your Phone?

Tool Yaar is also available as a lightweight native Android application. In version 7.2, navigate across 5 core sections: Home, Tools, Favourites, Playground, and Profile — with most utilities working 100% offline.

90% Offline
On-Device Safe Processing
50+ Built-in Utilities
Playground Casual Games
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Tool Yaar Mobile

Tool Yaar Mobile

5 Core App Sections

HomeToolsFavouritesPlaygroundProfile
Versionv7.2
PlatformAndroid 8.0+
Offline Support~90%
New in v7.2Playground Games