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Percentage Calculator

Calculate percentage of a number, percentage increase/decrease, and proportions.

What is X% of Y?

What is% of=30.00

X is what % of Y?

is what % of=+12.50%

Percentage Increase or Decrease

Fromto=+25.00%

How It Works

Provides instant answers for standard percentage scenarios (e.g. what is X% of Y, X is what % of Y, percentage difference).

Formula & Logic

Percentage = (Part / Whole) × 100 ; Change = ((New - Old) / Old) × 100
Example: A price increasing from $100 to $120 is a 20.00% increase.

Frequently Asked Questions

Common questions about calculations, assumptions, and edge cases.

Yes, Percentage Calculator is 100% free with unlimited calculations and zero paywalls or subscriptions.

In-Depth Guides & Tutorials

Explore all guides →
7 min read•finance

How to Calculate Percentages: Complete Beginner & Practical Guide

Master percentage calculations across all 3 standard scenarios: finding a percentage of a number, calculating proportions, and computing percentage increase or decrease.

Read Tutorial

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