Percentage Calculator

Calculate percentages, changes, discounts, reverse percentages, and markups.

Settings

Decimal places

1. Calculate Percentage of a Value

What is % of ?

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2. Find the Percentage

is what percent of ?

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3. Calculate Percentage Change

Change from to

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4. Add or Subtract a Percentage

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5. Reverse Percentage

is % of what?

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6. Discount / Sale Price

Price Discount %

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A percentage calculator is a simple yet powerful tool used to calculate percentages, increases, decreases, discounts, and more. Whether you’re a student, business owner, or shopper, understanding percentages helps you make better decisions quickly. The calculator above provides multiple ways to compute percentage-based values instantly.

What is a Percentage?

A percentage represents a number as a fraction of 100. It is denoted using the symbol “%”. For example, 50% means 50 out of 100.

Basic Formula:

Percentage = (Value / Total Value) × 100

This formula is widely used in academic calculations, financial analysis, and everyday problem-solving.

How to Calculate Percentage of a Number

To find a percentage of a given value, use the formula:

Result = (Percentage ÷ 100) × Total Value

For example:
20% of 150 = (20 ÷ 100) × 150 = 30

This is exactly what the first section of the calculator does automatically.

How to Find Percentage Between Two Numbers

If you want to determine what percentage one number is of another:

Percentage = (Part ÷ Whole) × 100

Example:
30 is what percent of 150?
(30 ÷ 150) × 100 = 20%

Percentage Increase and Decrease Formula

Understanding percentage change is essential in finance, business, and data analysis.

Formula:

Percentage Change = ((New Value – Original Value) ÷ Original Value) × 100

If the result is positive → Increase
If negative → Decrease

Example:
From 50 to 75 → ((75 − 50) ÷ 50) × 100 = 50% increase

Adding or Subtracting Percentages

To increase or decrease a value by a percentage:

Increase: New Value = Original + (Original × Percentage ÷ 100)
Decrease: New Value = Original − (Original × Percentage ÷ 100)

This is useful for calculating taxes, tips, or price changes.

Reverse Percentage Calculation

Sometimes you know the final value and percentage, but need the original value.

Formula:

Original Value = Final Value ÷ (Percentage ÷ 100)

Example:
120 is 80% of what?
120 ÷ 0.8 = 150

Discount and Sale Price Formula

To calculate the discounted price:

Final Price = Original Price − (Original Price × Discount ÷ 100)

Example:
₹999 with 20% discount = ₹999 − (999 × 0.20) = ₹799.2

Why Use This Percentage Calculator?

Fast and accurate calculations
Multiple percentage formulas in one place
Useful for students, professionals, and everyday use
Helps avoid manual calculation errors