Percentage Calculator

Calculate percentages instantly with our comprehensive percentage calculator. Choose from multiple calculation types and get step-by-step explanations for better understanding.

📊 What is X% of Y?

Calculate a percentage of a number. Example: What is 25% of 200?

🔍 X is what percent of Y?

Find what percentage one number is of another. Example: 50 is what percent of 200?

📈 Percentage Change

Calculate percentage increase or decrease between two values.

🎯 Find the Whole

If X is Y%, what is the total? Example: If 50 is 25%, what is 100%?

What is % of ?

25% of 200 = 50

15% of 80 = 12

30% of 150 = 45

is what percent of ?

50 is what % of 200 = 25%

30 is what % of 120 = 25%

75 is what % of 300 = 25%

From to

100 to 150 = +50%

200 to 150 = -25%

80 to 120 = +50%

If is %, what is 100%?

50 is 25% 100% = 200

30 is 15% 100% = 200

75 is 30% 100% = 250

How to Use the Percentage Calculator

Choose Calculation Type

Select the type of percentage calculation you need from the four available options: finding a percentage of a number, determining what percent one number is of another, calculating percentage change, or finding the whole number.

Enter Your Numbers

Input the values in the appropriate fields. The calculator accepts whole numbers, decimals, and negative numbers. Use the quick example buttons for common calculations or to see how the calculator works.

Get Instant Results

Click the Calculate button to get your result instantly. The calculator automatically updates as you type, providing real-time calculations for immediate feedback and faster workflow.

View Step-by-Step

Review the detailed explanation showing the formula used and calculation steps. This helps you understand the math behind the result and learn how to perform similar calculations manually.

Frequently Asked Questions

How do you calculate what percent one number is of another?

To find what percent X is of Y, divide X by Y and multiply by 100. The formula is: (X ÷ Y) × 100 = Percentage. For example, to find what percent 25 is of 100: (25 ÷ 100) × 100 = 25%. Our calculator does this automatically and shows you each step of the calculation.

What's the difference between percentage increase and percentage change?

Percentage change can be either positive (increase) or negative (decrease). It's calculated as: ((New Value - Old Value) ÷ Old Value) × 100. A positive result indicates an increase, while a negative result shows a decrease. For example, going from 100 to 120 is a +20% change, while going from 120 to 100 is a -16.67% change.

Can I calculate percentages with decimal numbers?

Yes! Our calculator works with whole numbers, decimals, and even negative numbers. You can calculate things like "What is 12.5% of 84.7?" or "15.3 is what percent of 67.8?". The calculator maintains precision and shows results with appropriate decimal places for accurate calculations.

How do I find the original number if I know the percentage and result?

Use the "Find the Whole" calculator. If you know that a certain number represents a specific percentage of the total, divide that number by the percentage (as a decimal) to find the whole. For example, if 30 is 15% of the total, then: 30 ÷ 0.15 = 200. So the total (100%) is 200.

What are some common real-world uses for percentage calculations?

Percentage calculations are used everywhere: calculating tips at restaurants, determining discounts while shopping, analyzing business growth rates, calculating tax amounts, figuring out loan interest, measuring academic grades, tracking investment returns, and analyzing statistical data. Our calculator handles all these scenarios with instant, accurate results.