A Percentage Calculator is a free online tool that helps you calculate percentages quickly and easily. Whether you want to find a percentage of a number, determine what percentage one number is of another, or solve a common percentage problem, Calculator Pool makes the calculation simple.

Percentages are used in everyday life for shopping discounts, exam marks, tax calculations, business figures, financial calculations, statistics, and many other situations.

Instead of calculating percentages manually, you can enter the required values into the calculator and get a quick result.

What Is a Percentage?

A percentage represents a number as a part of 100.

The word percent literally refers to “per hundred,” and the symbol % is used to represent a percentage.

For example:

• 1% means 1 out of 100
• 10% means 10 out of 100
• 25% means 25 out of 100
• 50% means 50 out of 100
• 100% means the entire amount

Percentages can also be represented as decimals and fractions.

For example:

25% = 0.25 = 25/100

Understanding percentages makes it easier to interpret discounts, marks, rates, ratios, and changes in values.

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How to Use the Percentage Calculator

Using Calculator Pool’s percent calculator is straightforward.

Enter the percentage and the number required by the calculator, then select the calculation option.

For example, to calculate 20% of 500:

Percentage: 20
Number: 500

The result is:

100

So:

20% of 500 = 100

The calculator performs the arithmetic automatically so you do not have to calculate it manually.

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Basic Percentage Formula

The basic percentage calculation formula is:

Percentage of a Number = (Percentage ÷ 100) × Number

Example

Find 15% of 800.

(15 ÷ 100) × 800

= 0.15 × 800

= 120

Therefore:

15% of 800 = 120

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How to Calculate What Percentage One Number Is of Another

Sometimes you know the part and the whole and want to determine the percentage.

Use:

Percentage = (Part ÷ Whole) × 100

Example

Suppose you scored 45 marks out of 60.

(45 ÷ 60) × 100

= 0.75 × 100

= 75%

Therefore:

45 is 75% of 60.

This type of calculation is commonly used for exam scores, completion rates, statistics, and performance measurements.

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How to Calculate a Percentage Increase

A percentage increase tells you how much a value has increased relative to its original value.

The formula is:

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

Example

Suppose the price of a product changes from ₹800 to ₹1,000.

Increase:

₹1,000 − ₹800 = ₹200

Percentage increase:

(₹200 ÷ ₹800) × 100

= 25%

So the price increased by 25%.

A percentage increase calculator can be particularly useful when comparing old and new values.

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How to Calculate a Percentage Decrease

A percentage decrease measures how much a value has fallen compared with the original value.

The formula is:

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

Example

Suppose a price falls from ₹1,000 to ₹800.

Decrease:

₹1,000 − ₹800 = ₹200

Percentage decrease:

(₹200 ÷ ₹1,000) × 100

= 20%

Therefore, the value decreased by 20%.

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Percentage Difference

Percentage difference is useful when comparing two values without treating one of them as the original value.

A commonly used formula is:

Percentage Difference = |Value 1 − Value 2| ÷ ((Value 1 + Value 2) ÷ 2) × 100

Example

Suppose the values are:

80 and 100

Difference:

|80 − 100| = 20

Average:

(80 + 100) ÷ 2 = 90

Percentage difference:

(20 ÷ 90) × 100

≈ 22.22%

Percentage difference is different from percentage increase or decrease because it uses the average of the two values as the reference.

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Percentage Examples

Here are some common percentage calculations.

What is 10% of 500?

10% of 500 = 50

What is 20% of 750?

20% of 750 = 150

What is 25% of 1,200?

25% of 1,200 = 300

What is 30% of 2,000?

30% of 2,000 = 600

What percentage is 40 of 80?

(40 ÷ 80) × 100 = 50%

What percentage is 75 of 100?

(75 ÷ 100) × 100 = 75%

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Percentage Calculator for Discounts

Percentages are widely used to calculate shopping discounts.

Suppose an item costs:

₹2,500

and the discount is:

20%

Discount amount:

₹2,500 × 20 ÷ 100 = ₹500

Final price:

₹2,500 − ₹500 = ₹2,000

So the customer saves:

₹500

You can also use Calculator Pool’s Discount Calculator for dedicated discount calculations.

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Percentage Calculator for Exam Marks

Students frequently use percentages to calculate exam scores.

The basic formula is:

Percentage = (Marks Obtained ÷ Total Marks) × 100

Example

Suppose a student scores:

420 marks out of 500

Percentage:

(420 ÷ 500) × 100

= 84%

Therefore, the student’s score is:

84%

This method can be used for individual exams or total marks, provided the scoring system is suitable for a simple percentage calculation.

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Percentage Calculator for Business

Businesses use percentages in many different ways.

Examples include:

• Profit margins
• Sales growth
• Revenue changes
• Commission calculations
• Discounts
• Price changes
• Performance percentages
• Completion percentages

For example, if a business’s monthly sales increase from ₹5 lakh to ₹6 lakh, the increase is:

₹1 lakh

Percentage increase:

(₹1 lakh ÷ ₹5 lakh) × 100 = 20%

So sales increased by:

20%

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Percentage Calculator for Finance

Percentages are commonly used in finance for:

• Interest rates
• Investment returns
• Growth rates
• Fees
• Tax rates
• Profit margins
• Loan calculations

For example, if an investment of ₹50,000 grows by 8%:

₹50,000 × 8 ÷ 100 = ₹4,000

The increase is:

₹4,000

The total would be:

₹54,000

This is a simple percentage example; actual investment returns may involve compounding, market movements, fees, taxes, or other factors.

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Percentage Calculator for Tax and GST

Tax rates are commonly expressed as percentages.

Suppose a taxable amount is:

₹10,000

and the applicable tax rate is:

18%

Tax amount:

₹10,000 × 18 ÷ 100 = ₹1,800

Tax-inclusive amount:

₹10,000 + ₹1,800 = ₹11,800

For dedicated GST calculations, use our GST Calculator, especially when you need to work with GST-inclusive and GST-exclusive amounts.

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Percentage Increase vs Percentage Points

A common source of confusion is the difference between percentage and percentage points.

Suppose a rate changes from:

8% to 10%

The difference is:

2 percentage points

But the relative increase is:

(2 ÷ 8) × 100 = 25%

Therefore:

• Change = 2 percentage points
• Relative increase = 25%

These terms are not interchangeable.

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How to Convert a Percentage to a Decimal

To convert a percentage to a decimal, divide it by 100.

Examples:

10% = 0.10

25% = 0.25

50% = 0.50

75% = 0.75

125% = 1.25

Example

Convert 35% to a decimal:

35 ÷ 100 = 0.35

Therefore:

35% = 0.35

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How to Convert a Decimal to a Percentage

To convert a decimal into a percentage, multiply it by 100.

Examples:

0.10 = 10%

0.25 = 25%

0.50 = 50%

0.75 = 75%

Example

Convert 0.42 into a percentage:

0.42 × 100 = 42%

Therefore:

0.42 = 42%

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How to Convert a Fraction to a Percentage

To convert a fraction into a percentage:

Percentage = Fraction × 100

Example

Convert:

3/4

into a percentage:

(3 ÷ 4) × 100 = 75%

Therefore:

3/4 = 75%

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Percentage Calculation Shortcuts

Some percentages are easy to calculate mentally.

10%

Divide the number by 10.

10% of 900 = 90

5%

Calculate 10% and divide by 2.

5% of 900 = 45

1%

Divide the number by 100.

1% of 900 = 9

50%

Take half.

50% of 900 = 450

25%

Take one-fourth.

25% of 900 = 225

These shortcuts are useful for quick mental calculations, while an online percentage calculator can help when you need a fast and precise result.

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Can a Percentage Be More Than 100%?

Yes.

A percentage can be greater than 100% when a value is larger than the reference amount.

For example:

150% = 1.5 times the reference value

Suppose a value increases from 100 to 250.

The new value is:

250% of the original value

The increase itself is:

150%

This distinction is important because “250% of” and “250% increase” are not the same thing.

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Why Is Percentage Calculation Important?

Percentages make it easier to compare values that may have different absolute sizes.

For example, saying:

₹50 increase

does not tell you as much as saying:

10% increase

because the percentage gives the change relative to the original amount.

Percentages are therefore useful in:

• Education
• Business
• Finance
• Economics
• Statistics
• Shopping
• Taxation
• Health and fitness
• Everyday calculations

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Common Percentage Mistakes

Using the Wrong Reference Value

For percentage increase or decrease, the original value is normally used as the reference.

Confusing Percentage With Percentage Points

A change from 10% to 12% is a 2 percentage-point increase, not a 2% relative increase.

Treating Successive Changes as Additive

A 20% increase followed by a 20% decrease does not bring the value back to its original amount.

For example:

Start with:

₹1,000

Increase by 20%:

₹1,200

Decrease by 20%:

₹960

The final value is ₹960, not ₹1,000.

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Successive Percentage Changes

When multiple percentage changes are applied one after another, each change may use the updated value as its new reference.

For example:

Initial value:

₹2,000

First increase:

10%

New value:

₹2,200

Second increase:

10% of ₹2,200 = ₹220

Final value:

₹2,420

The combined increase is therefore:

21%

not 20%.

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Percentage Calculation in Everyday Life

Percentages appear in everyday situations more often than many people realize.

You may use them to:

• Compare sale prices
• Calculate exam scores
• Understand salary increases
• Compare business growth
• Work out taxes
• Calculate discounts
• Compare investment returns
• Understand statistics
• Measure progress toward a target

A reliable percentage calculator online can save time whenever you need to perform these calculations repeatedly.

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Frequently Asked Questions

What is a Percentage Calculator?

A Percentage Calculator is an online tool that helps calculate percentages and solve common percentage problems quickly.

How do I calculate a percentage?

To calculate a percentage of a number:

(Percentage ÷ 100) × Number

For example:

20% of 500 = 100

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

Use:

(Part ÷ Whole) × 100

For example:

50 ÷ 200 × 100 = 25%

How do I calculate percentage increase?

Use:

((New Value − Original Value) ÷ Original Value) × 100

How do I calculate percentage decrease?

Use:

((Original Value − New Value) ÷ Original Value) × 100

What is 10% of 1,000?

100

What is 25% of 800?

200

What is 50% of 600?

300

Can a percentage be greater than 100%?

Yes. A percentage can be greater than 100% when the value is more than the reference amount.

What is the difference between percentage and percentage points?

Percentage points show the arithmetic difference between two percentages, while a percentage change describes the relative change.

For example, from 8% to 10% is a 2 percentage-point increase and a 25% relative increase.

Can I use the Percentage Calculator for discounts?

Yes. It can help calculate the percentage amount of a price. For dedicated discount calculations, you can also use the Calculator Pool Discount Calculator.

Can I use it for GST calculations?

You can calculate the mathematical percentage amount, but GST-inclusive and GST-exclusive calculations have specific formulas. For those calculations, use the Calculator Pool GST Calculator.

Is the Percentage Calculator free?

Yes. Calculator Pool’s Percentage Calculator is free to use online.

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Related Calculators

You may also find these Calculator Pool tools useful:

Discount Calculator

Calculate percentage discounts, savings, discount amounts, and final selling prices.

GST Calculator

Calculate GST amounts and GST-inclusive or GST-exclusive prices.

Compound Interest Calculator

Calculate compound interest and estimate future investment values.

EMI Calculator

Calculate estimated monthly loan EMI, total interest, and total repayment.

SIP Calculator

Estimate potential SIP investment growth, total investment, and maturity value.

Date Calculator

Calculate the difference between two dates and add or subtract days.

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Percentage Calculator – Quick Summary

A percentage represents a value as a part of 100.

The basic formula is:

Percentage of a Number = (Percentage ÷ 100) × Number

To determine what percentage one number is of another:

Percentage = (Part ÷ Whole) × 100

For percentage increase:

((New Value − Original Value) ÷ Original Value) × 100

For percentage decrease:

((Original Value − New Value) ÷ Original Value) × 100

Percentages are widely used in shopping, education, finance, business, taxes, statistics, and everyday calculations.

Use Calculator Pool’s free Percentage Calculator to perform common percentage calculations quickly and easily.

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