Use our free Percentage Calculator to calculate percentages quickly and accurately. Whether you want to find a percentage of a number, calculate a percentage increase or decrease, measure percentage change, or find an average percentage, this tool gives you an instant result.

The calculator is useful for students, shoppers, teachers, business owners, employees, marketers, financial professionals, and anyone who needs to work with percentages in everyday life.

Simply enter your values into the calculator above and get your result in seconds.

What Is a Percentage Calculator?

A Percentage Calculator is an online tool that helps you solve common percentage calculations without manually working through mathematical formulas.

A percentage represents a value as a fraction of 100.

For example:

Percentages are used in many everyday situations, including discounts, taxes, exam scores, business growth, investment returns, salary increases, website analytics, profit margins, interest rates, and financial comparisons.

Instead of calculating everything manually, you can use our Percentage Calculator to get the answer quickly.

How to Use the Percentage Calculator

Using the calculator is simple.

1. Choose the type of percentage calculation you want to perform.
2. Enter the required numbers.
3. Click the Calculate button.
4. View your result instantly.
5. Change the numbers to perform another calculation.

Example

Suppose you want to calculate 20% of 500.

The formula is:

20 ÷ 100 × 500 = 100

Therefore:

20% of 500 = 100

Percentage Calculator Formulas

The table below shows the most commonly used percentage formulas.

Understanding these formulas can help you verify the result produced by the calculator.

How to Calculate Percentage

The basic percentage formula is:

Percentage = (Part ÷ Whole) × 100

Example

A student answers 45 questions correctly out of 50.

(45 ÷ 50) × 100 = 90%

The student's score is:

90%

You can also calculate a specific percentage of a number.

The formula is:

Percentage Value = (Percentage ÷ 100) × Number

For example:

15% of 200

Calculation:

15 ÷ 100 × 200 = 30

Therefore:

15% of 200 = 30

Common Percentage Calculation Examples

Here are several common percentage calculations.

These calculations are commonly used when working with discounts, tax rates, commissions, grades, budgets, and financial figures.

Percentage Change Calculator

A percentage change calculator measures how much a value has increased or decreased compared with its original value.

It is commonly used to compare:

• Product prices
• Monthly revenue
• Website traffic
• Sales
• Business expenses
• Investment values
• Population growth
• Marketing performance
• Test scores
• Monthly or annual results

The percentage change formula is:

Percentage Change = ((New Value − Original Value) ÷ Original Value) × 100

Percentage Change Example

Suppose a product originally cost $80 and its new price is $100.

First calculate the difference:

100 − 80 = 20

Then divide the difference by the original value:

20 ÷ 80 = 0.25

Multiply by 100:

0.25 × 100 = 25%

Therefore, the price increased by:

25%

Understanding Positive and Negative Percentage Change

For example:

If a value changes from 100 to 120, the percentage change is +20%.

If a value changes from 100 to 80, the percentage change is -20%.

Percentage Increase Calculator

Percentage increase shows how much a number has grown compared with its original value.

The formula is:

Percentage Increase = ((New Value − Original Value) ÷ Original Value) × 100

Percentage Increase Example

Suppose monthly sales increase from $2,000 to $2,500.

Difference:

2,500 − 2,000 = 500

Divide by the original amount:

500 ÷ 2,000 = 0.25

Multiply by 100:

0.25 × 100 = 25%

Therefore:

Sales increased by 25%.

Percentage Increase Examples

Percentage Decrease Calculator

A percentage decrease calculator helps you determine how much a value has fallen compared with its original value.

The percentage decrease formula is:

Percentage Decrease = ((Original Value − New Value) ÷ Original Value) × 100

Percentage decrease calculations are useful for:

• Product discounts
• Falling prices
• Reduced expenses
• Lower website traffic
• Sales declines
• Weight reduction
• Budget reductions
• Inventory changes
• Financial comparisons

Percentage Decrease Example

Suppose the original price of an item is $250 and the new price is $200.

First calculate the decrease:

250 − 200 = 50

Divide the decrease by the original value:

50 ÷ 250 = 0.20

Multiply by 100:

0.20 × 100 = 20%

Therefore:

The price decreased by 20%.

Percentage Decrease Examples

Percentage Increase vs Percentage Decrease

Although both calculations compare a new value with an original value, the formulas are slightly different.

For example:

Original price: $100

New price: $120

Percentage increase: 20%

If the price changes from $100 to $80, the percentage decrease is:

20%

Average Percentage Calculator

An average percentage calculator helps you calculate the average of multiple percentages.

If every percentage has equal importance, you can add the percentages together and divide the total by the number of percentages.

The formula is:

Average Percentage = Sum of Percentages ÷ Number of Percentages

Average Percentage Example

Suppose you have three percentages:

70%, 80%, and 90%

Add them:

70 + 80 + 90 = 240

Divide by the number of values:

240 ÷ 3 = 80

Therefore:

The average percentage is 80%.

Average Percentage Examples

Percentage Average Calculator

A percentage average calculator is useful when several percentage values have equal weight.

For example:

If your monthly performance scores are:

80%, 90%, 70%, and 100%

The average is:

(80 + 90 + 70 + 100) ÷ 4

340 ÷ 4 = 85%

Therefore:

Average percentage = 85%

However, there is an important mathematical rule to understand.

You should not always calculate a percentage average by simply adding percentages and dividing them.

If the percentages are based on groups of different sizes or values with different importance, a weighted average may be required.

Simple Average Percentage vs Weighted Average Percentage

Weighted Percentage Example

Suppose your final grade contains:

The final percentage cannot be calculated correctly by simply averaging 80%, 70%, and 90%.

Instead, each score must be multiplied by its weight.

This is called a weighted percentage average.

Percentage Difference vs Percentage Change

Percentage difference and percentage change are related calculations, but they are not the same.

Example

If a product price changes from $100 to $120, percentage change is appropriate because $100 is the original price.

If you are comparing two independent measurements from different sources, percentage difference may be more appropriate.

Everyday Uses of a Percentage Calculator

Percentages are used in many areas of daily life.

Shopping Discounts

Suppose an item costs $120 and has a 25% discount.

Discount:

25% of 120 = 30

Final price:

120 − 30 = 90

You pay:

$90

Restaurant Tips

Suppose your restaurant bill is $80 and you want to leave a 15% tip.

Tip:

15% of 80 = 12

Total bill:

80 + 12 = 92

You pay:

$92

Exam Scores

Suppose you answer 72 out of 80 questions correctly.

Calculation:

(72 ÷ 80) × 100 = 90%

Your score is:

90%

Salary Increase

Suppose your salary is $4,000 per month and you receive a 10% increase.

Increase:

10% of 4,000 = 400

New salary:

4,000 + 400 = 4,400

Your new monthly salary is:

$4,400

Business Growth

Suppose monthly revenue increases from $10,000 to $12,500.

Calculation:

((12,500 − 10,000) ÷ 10,000) × 100

Result:

25%

Revenue increased by 25%.

Percentage Examples for Everyday Situations

Why Use Our Online Percentage Calculator?

Our online Percentage Calculator helps simplify calculations that would otherwise require multiple mathematical steps.

Fast Results

Enter your numbers and get your percentage result instantly.

Easy to Use

The calculator is designed for both beginners and experienced users.

Multiple Percentage Calculations

You can use percentage tools for increases, decreases, changes, averages, discounts, scores, financial figures, and everyday comparisons.

Reduces Manual Calculation

The tool helps reduce calculation mistakes by automatically applying the appropriate percentage formula.

Useful on Any Device

Use the calculator from a desktop computer, tablet, or mobile device whenever you need to calculate percentages.

Percentage Calculation Quick Reference

Frequently Asked Questions

How to calculate percentage with calculator?

To calculate a percentage with a calculator, divide the percentage by 100 and multiply the result by the number.

For example, to calculate 25% of 240:

25 ÷ 100 = 0.25

Then:

0.25 × 240 = 60

Therefore:

25% of 240 is 60.

You can also use our online Percentage Calculator by entering your values and selecting the type of percentage calculation you need.

What is percentage calculator?

A percentage calculator is an online tool used to solve percentage-related calculations quickly.

It can help you:

• Find a percentage of a number
• Find what percentage one number is of another
• Calculate percentage increases
• Calculate percentage decreases
• Calculate percentage change
• Find average percentages

It is useful for education, shopping, business, finance, budgeting, discounts, salaries, grades, analytics, and everyday calculations.

How do I calculate percentage change?

Use the following formula:

Percentage Change = ((New Value − Original Value) ÷ Original Value) × 100

For example, if a value changes from 100 to 125:

((125 − 100) ÷ 100) × 100 = 25%

The value increased by 25%.

How do I calculate percentage decrease?

Subtract the new value from the original value, divide the result by the original value, and multiply by 100.

For example, if a price drops from 200 to 150:

((200 − 150) ÷ 200) × 100 = 25%

The percentage decrease is:

25%

How do you calculate average percentage?

If every percentage has equal importance, add all percentages together and divide the result by the number of percentages.

Example:

75% + 85% + 95% = 255%

Then:

255 ÷ 3 = 85%

The average percentage is:

85%

Can you always average percentages?

No.

A simple average works when all percentages have equal weight.

If the percentages represent different group sizes or have different importance, you may need to calculate a weighted average instead.

What is 10% of 100?

10% of 100 = 10

Calculation:

10 ÷ 100 × 100 = 10

What is 20% of 500?

20% of 500 = 100

Calculation:

20 ÷ 100 × 500 = 100

What is 25% of 200?

25% of 200 = 50

Calculation:

25 ÷ 100 × 200 = 50

What is 50% of 500?

50% of 500 = 250

Calculation:

50 ÷ 100 × 500 = 250

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

Divide the first number by the second number and multiply by 100.

For example:

What percentage is 30 of 120?

(30 ÷ 120) × 100 = 25%

Therefore:

30 is 25% of 120.

What is the difference between percentage increase and percentage decrease?

Percentage increase measures how much a value has grown compared with its original value.

Percentage decrease measures how much a value has fallen compared with its original value.

Both calculations use the original value as the reference point.

Is this Percentage Calculator free?

Yes. You can use this Percentage Calculator online whenever you need to perform percentage calculations.

Calculate Percentages Instantly

Whether you are calculating a shopping discount, exam score, salary increase, price reduction, percentage change, business growth, or average percentage, our Percentage Calculator makes the process quick and simple.

Enter your numbers into the calculator above and get your result instantly.