Percentage Calculator

A percentage is one of the most used math concepts in real life, whether you're calculating exam scores, discounts in a sale, interest rates, or salary hikes. The percentage calculator on this page helps you solve common percentage problems without doing manual math.

This tool is helpful for students, professionals, teachers, and anyone who needs to calculate percentages regularly. It gives accurate results for finding percentage values, calculating percentage change, or comparing one number to another in percentage terms.

What Is a Percentage?

The word "percent" means "per hundred." So when we say 10%, we are referring to 10 out of 100, or 10 ÷ 100

For example:

• 25% = 25 out of 100 = 0.25
• 50% = half
• 100% = the whole
• 200% = double

Percentages represent parts of a whole, based on 100. They make comparing ratios, showing proportions, and communicating data clearly across different contexts easier.

About this calculator

This percentage calculator can solve three significant types of problems:

1. What is X% of Y?

Let's say you want to find 15% of 800 maybe it's a discount or commission. Here's how you can calculate

Formula: (X ÷ 100) × Y = Result

Example:

15% of 800 = (15 ÷ 100) × 800 = 120

So, 15% of 800 is 120 — meaning if something costs $800, a 15% discount would save you $120.

2. X is what percent of Y?

Say you want to find out what percent 30 is of 200: like checking how much of your monthly budget a $30 expense takes.

Formula:
(X ÷ Y) × 100 = Percentage

Example:
(30 ÷ 200) × 100 = 15%

So, 30 is 15% of 200 — meaning that $30 is 15% of your $200 budget.

3. Percentage Increase or Decrease

Trying to measure growth or loss? Maybe your rent increased from $1200 to $1500.

Formula:
(New − Old) ÷ Old × 100 = Change in %

Example:
(1500 − 1200) ÷ 1200 × 100 = 25%

That’s a 25% increase.
If the result was negative (e.g., your bill dropped from 1500 to 1200), it would be a 25% decrease instead.

Use of Percentages in Real Life

Percentages appear in almost every aspect of your daily life. Here’s how:

Discounts and Offers

Let's say a product originally costs $1000 and is on sale for 25% off, how much do you pay?

• Discount = 25% of 1000 = $250
• Final price = $1000 - $250 = $750

Exams and Results

If you scored 78 marks out of 100 in one subject and 155 out of 200 in another, your percentage helps compare both scores.

• 78 ÷ 100 × 100 = 78%
• 155 ÷ 200 × 100 = 77.5%

Salary Hike

If your salary increased from $45,000 to $52,000. What’s the raise percentage?

• Increase in Salary: $52,000 − $45,000 = $7,000
• Percentage Hike: (7,000 ÷ 45,000) × 100 = 15.56%

Business and Profits

You sold a product for $2,400 that cost you $2,000. What’s your profit margin?

• Profit: $2400 - $2000 = $400
• Profit %: (400 ÷ 2,000) × 100 = 20%