💯 The Ultimate Online Percentage Calculator

Solve all your percentage problems instantly and accurately for math, finance, and shopping.

Calculate Percentages in Three Ways

1. Calculate a Percentage of a Number

Example: What is 15% of 80?

% of

Result: 0

2. Find What Percent a Number is of Another

Example: 12 is what % of 60?

is what % of

Result: 0%

3. Add or Subtract a Percentage

Example: Add 20% to 150.

%

Result: 0

This tool performs instant calculations locally in your browser, ensuring speed and privacy.

A Simple Guide: How To Use the Percentage Calculator

Our tool is designed for maximum ease of use. You don't need a math degree—just follow these quick steps for any of the three modes.

1

Select Your Goal

Choose the calculation mode you need: finding the part, finding the percentage, or adjusting a value by a percentage.

2

Input Your Numbers

Enter the required values (the percent and the total, or the two numbers) into the respective fields.

3

Get the Instant Answer

The result is calculated automatically and displayed in the Result box below the inputs, saving you time!

The Benefits of Using Our Online Percentage Tool

  • Instant Accuracy: Eliminate calculation errors and get precise results in real-time.
  • Financial Planning: Easily calculate discounts, tips, sales tax, and loan interest rates (e.g., EMI percentages).
  • Educational Aid: A great tool for students to check homework and understand percentage concepts quickly.
  • No Downloads Required: This is a purely HTML, CSS, and JavaScript tool, meaning it works instantly in your browser on any device.

Frequently Asked Questions (FAQs)

A percentage is a way of expressing a number as a fraction of 100. It is written with the percent sign (%). For example, 50% means 50 out of 100, which is the same as the fraction 50/100 or the decimal 0.50.

To calculate a percentage of a number, use the formula: X% of Y = (X ÷ 100) × Y. For example, 15% of 80 is (15 ÷ 100) × 80 = 12.

To find what percent one number is of another, use the formula: percentage = (part ÷ whole) × 100. For example, if 12 is part and 60 is whole, then percentage = (12 ÷ 60) × 100 = 20%.

To increase a number by a percentage, multiply it by (1 + percentage ÷ 100). To decrease a number by a percentage, multiply it by (1 − percentage ÷ 100). For example, increasing 150 by 20% gives 150 × 1.20 = 180, and decreasing 150 by 20% gives 150 × 0.80 = 120.

Yes. You can use this percentage calculator to work out discounts on shopping bills, GST or tax amounts, tip calculations, profit or loss percentages, and simple interest-based percentage changes.

Yes, the percentage calculator is completely free. All calculations run directly in your browser using JavaScript, so your input values are not sent to any server, making it private and secure.