Free Percentage Calculator

What Is a Percentage Calculator?

A percentage calculator helps you work out proportional values without manual math. ToolKit Pro's tool covers three common scenarios: finding a percentage of a number, calculating percentage change between two values, and finding what percent one number is of another.

How to Use This Tool

1. Choose a mode: % of Number, % Change, or X is what % of Y.
2. Enter your values into the fields.
3. Your result appears instantly as you type.

Benefits of Using ToolKit Pro's Percentage Calculator

• Three modes in one tool — covers the most common percentage calculations.
• Instant results — no button click needed.
• Free and private — nothing leaves your browser.
• Simple, clear layout — pick a mode and go.

Why Use ToolKit Pro?

Percentage calculations come up constantly — from checking a discount, to understanding a raise, to comparing exam scores. ToolKit Pro's calculator removes the guesswork and manual math from all three common scenarios.

Percentage Formulas

• % of Number: Result = (Percentage ÷ 100) × Number
• % Change: Change % = ((New Value − Original Value) ÷ Original Value) × 100
• X is what % of Y: Percent = (X ÷ Y) × 100

Real-Life Examples

• Finding 20% of 500 for a tip or discount calculation.
• Calculating the percentage increase between last year's and this year's sales.
• Finding what percent 45 is of 60 for a test score.

Helpful Tips

• A negative result in % Change mode means a decrease, not an increase — pay attention to the sign.