Published: August 2, 2026

Percentage Calculator

Free online percentage calculator for quick calculations

Percentage calculator. Calculate percentages, percentage increase/decrease, and find what percent one number is of another. Perfect for shopping discounts

Select Calculation Type

What do you want to calculate?

Percentage (%)

Of Number

Result:

Quick Reference Formulas

X% of Y: (X ÷ 100) × Y

X is what % of Y: (X ÷ Y) × 100

% Change: ((New − Original) ÷ Original) × 100

How to calculate a percentage of a number?

Want to know what 20% of $150 is? Here's how:

Select 'What is X% of Y?' from the calculation type dropdown.
Enter the percentage value (e.g., 20) in the first field.
Enter the total number (e.g., 150) in the second field.
The result shows instantly — 20% of 150 = 30.

How to calculate percentage change?

Need to find the percentage increase or decrease between two values?

Select '% Change' from the calculation type dropdown.
Enter the original value in the first field.
Enter the new value in the second field.
The result shows the percentage change — positive for increase, negative for decrease.

How to find what percent one number is of another?

Wondering what percent 25 is of 200?

Select 'X is what % of Y?' from the calculation type dropdown.
Enter the part (e.g., 25) in the first field.
Enter the whole (e.g., 200) in the second field.
The result shows the percentage — 25 is 12.5% of 200.

Why do you need a percentage calculator?

Percentages are everywhere in our daily lives. From calculating discounts while shopping to figuring out tips at restaurants, from understanding interest rates on loans to interpreting statistical data in news reports. While mental math works for simple cases like 10% or 25%, things get tricky fast with numbers like 17% of 349 or finding the percentage change from 45 to 67. Our percentage calculator handles all these scenarios instantly and accurately, saving you time and eliminating calculation errors.

Real-world situations where percentage calculations matter

Shopping discounts: A $89 jacket is 30% off. How much do you save? What's the final price?
Restaurant tips: Your bill is $67.50 and you want to leave an 18% tip. How much is that?
Test scores: You got 42 correct answers out of 50 questions. What's your percentage score?
Financial growth: Your investment grew from $1,200 to $1,560. What was the percentage gain?
Salary changes: Your salary increased from $55,000 to $60,500. What's the raise percentage?
Data analysis: Website traffic went from 12,000 to 15,600 visitors. What's the growth rate?

Frequently Asked Questions (FAQs)

How do you calculate a percentage manually?

To find X% of a number, multiply the number by X and divide by 100. For example, 25% of 200 = (25 × 200) ÷ 100 = 50. To find what percent A is of B, divide A by B and multiply by 100. For example, 30 is what percent of 120? (30 ÷ 120) × 100 = 25%.

How do you calculate percentage increase or decrease?

Percentage change = ((New Value - Original Value) ÷ Original Value) × 100. If the result is positive, it's an increase. If negative, it's a decrease. For example, if a price goes from $50 to $65: (($65 - $50) ÷ $50) × 100 = 30% increase.

Can this calculator handle decimal percentages?

Yes! You can enter any percentage value including decimals like 12.5%, 3.75%, or even 0.5%. The calculator handles all precision levels accurately.

Is my calculation data stored anywhere?

No. All calculations happen directly in your browser using JavaScript. No data is sent to any server, stored, or tracked. Your calculations remain completely private.

Can I use this for financial calculations?

This calculator provides accurate mathematical results for any percentage calculation. However, for critical financial decisions, always double-check important figures and consider consulting a financial professional for complex scenarios involving compound interest or tax calculations.