How do I calculate a percentage of a number?

Use the 'What is X% of Y?' mode. Enter the percentage as X and the whole number as Y. For example, 20% of 150 = 30.

How do I find what percentage one number is of another?

Use the 'X is what % of Y?' mode. Enter the part as X and the whole as Y. For example, 30 is what % of 150 = 20%.

How is percentage change calculated?

Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result means increase, negative means decrease.

How many decimal places does it show?

Results are shown with up to 4 decimal places, with trailing zeros removed for clean display.

How do I calculate a percentage of a number?

Use the 'What is X% of Y?' mode. Enter the percentage as X and the whole number as Y. For example, 20% of 150 = 30.

How do I find what percentage one number is of another?

Use the 'X is what % of Y?' mode. Enter the part as X and the whole as Y. For example, 30 is what % of 150 = 20%.

How is percentage change calculated?

Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result means increase, negative means decrease.

How many decimal places does it show?

Results are shown with up to 4 decimal places, with trailing zeros removed for clean display.

Math & Number Tools

Percentage Calculator

Calculate percentages, find what percent a number is, and compute percentage changes.

How to Use

Choose calculation type

Select from four modes: What is X% of Y, X is what % of Y, X is Y% of what, or percentage change.

Enter your numbers

Fill in the two number inputs for your chosen calculation mode.

Click Calculate

Click Calculate to get the instant result.

Copy the result

Click Copy to copy the result to your clipboard.

About This Tool

Free Online Percentage Calculator

The Versatools Percentage Calculator handles all common percentage calculations in one tool. Whether you need to find a percentage of a number, calculate what percentage one number is of another, work backwards from a percentage, or calculate percentage change, our calculator delivers instant accurate results.

Four Calculation Modes

What is X% of Y? finds a percentage of a number, such as calculating a 15% tip on a $50 bill. X is what % of Y? finds the percentage relationship, like what percentage is 30 out of 120. X is Y% of what? works backwards to find the whole when you know a part and its percentage. Percentage Change calculates increase or decrease between two values, showing whether it is an increase or decrease.

Everyday Uses for Percentage Calculations

Percentage calculations appear in almost every area of daily life. Retail discounts, tax calculations, investment returns, exam scores, nutritional information, and statistical data all involve percentages. Our calculator eliminates the mental math and potential errors that come with manual percentage calculations.

Frequently Asked Questions

Related Tools

Tip Calculator