Percentage Calculator

Quickly find percentages, calculate percentage increase or decrease, and determine what percentage one number is of another.

Percentage (%)

Of value

Key Takeaways & Quick Facts

Primary Purpose

Calculate percentages, percentage change, and percentage of a number.

Execution Environment

100% Client-Side In-Browser (Zero Cloud Uploads)

Standard Verification

Calculations tested against standard benchmarks

How to Use Percentage Calculator

Select the calculation type: "X% of Y", "X is what % of Y", "% Change", or "% Difference".
Enter the required values in the input fields.
Click "Calculate" to see the result with step-by-step working.
Use "Reset" to clear all fields and start over.

How it Works

The Percentage Calculator uses standard arithmetic formulas to compute percentages. Each mode applies a different formula suited to common real-world percentage questions — from finding a percentage of a number to calculating how much a value has increased or decreased.

X% of Y = (X ÷ 100) × Y X is what % of Y = (X ÷ Y) × 100 % Change = ((New − Old) ÷ |Old|) × 100 % Difference = (|A − B| ÷ ((A + B) ÷ 2)) × 100

Examples

Input: What is 20% of 500?

Result: 100

Input: 45 is what % of 200?

Result: 22.5%

Input: % change from 80 to 100

Result: 25% increase

Input: % difference between 40 and 60

Result: 40%

Frequently Asked Questions

How do I calculate a percentage of a number?

Divide the percentage by 100, then multiply by the number. For example, 15% of 200 = (15 ÷ 100) × 200 = 30.

What is the difference between percentage change and percentage difference?

Percentage change measures the increase or decrease from an original value to a new value. Percentage difference compares two values without treating either as the "original" — it uses the average of both values as the denominator.