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Percentage Calculator

Calculate percentages quickly and accurately. Find percentage of a number, percentage increase, decrease, and more with our free online percentage calculator.

What is X% of Y?

Percentage (%)

Value

Result

Calculation: -

With Increase: 0

With Decrease: 0

About This Percentage Calculator

Our free percentage calculator helps you quickly calculate percentages for everyday use. Whether you're calculating discounts while shopping, finding tips at restaurants, determining grade scores, or analyzing business metrics, this tool provides instant and accurate results. For specific discount calculations, try our discount calculator or for restaurant tips, use our tip calculator.

The calculator shows you the percentage result, the calculation used, and bonus information including what the value would be with the percentage added (increase) or subtracted (decrease). This makes it easy to see the full picture of your percentage calculations. For academic calculations, check out our GPA calculator or grade calculator.

How to Use the Percentage Calculator

Enter the Percentage: Input the percentage you want to calculate (e.g., 20 for 20%).
Enter the Value: Input the number you want to find the percentage of (e.g., 100).
Click Calculate: Get instant results showing what X% of Y equals.
View Additional Results: See the value with percentage increase and decrease for complete information.

Common Percentage Calculations

Finding X% of Y: Simply multiply the number by the percentage as a decimal. For example, 25% of 200 = 200 × 0.25 = 50.

Percentage Increase: This shows what the original value becomes after adding the percentage. For example, 200 + 25% = 200 + 50 = 250.

Percentage Decrease: This shows what the original value becomes after subtracting the percentage. For example, 200 - 25% = 200 - 50 = 150.

Real-World Percentage Examples

Shopping & Discounts

Example: A $80 shirt is on sale for 25% off. How much do you save, and what's the final price?

Discount amount: 25% of $80 = $20
Final price: $80 - $20 = $60

Tips & Service Charges

Example: Your restaurant bill is $45, and you want to leave a 20% tip. How much is the tip?

Tip amount: 20% of $45 = $9
Total to pay: $45 + $9 = $54

Grade Calculations

Example: You got 42 questions correct out of 50. What's your percentage score?

Score: (42 ÷ 50) × 100 = 84%

Business & Finance

Example: Your sales increased from $10,000 to $12,500. What's the percentage increase?

Increase: $12,500 - $10,000 = $2,500
Percentage: ($2,500 ÷ $10,000) × 100 = 25% increase

Tax Calculations

Example: An item costs $100 before tax. If sales tax is 8%, what's the total?

Tax amount: 8% of $100 = $8
Total price: $100 + $8 = $108

Percentage Formulas

Basic Percentage Formula

Formula: Percentage = (Part ÷ Whole) × 100

Example: What percentage is 30 of 150?
(30 ÷ 150) × 100 = 20%

Find X% of Y

Formula: Result = (Percentage ÷ 100) × Value

Example: What is 15% of 200?
(15 ÷ 100) × 200 = 30

Percentage Increase

Formula: % Increase = ((New Value - Old Value) ÷ Old Value) × 100

Example: Price increased from $50 to $65
((65 - 50) ÷ 50) × 100 = 30% increase

Percentage Decrease

Formula: % Decrease = ((Old Value - New Value) ÷ Old Value) × 100

Example: Price decreased from $100 to $75
((100 - 75) ÷ 100) × 100 = 25% decrease

Percentage Change

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

Note: Positive result = increase, Negative result = decrease

Converting Between Formats

Percentage to Decimal: Divide by 100 (e.g., 75% = 0.75)
Decimal to Percentage: Multiply by 100 (e.g., 0.5 = 50%)
Percentage to Fraction: Write over 100 and simplify (e.g., 25% = 25/100 = 1/4)
Fraction to Percentage: Divide and multiply by 100 (e.g., 3/4 = 0.75 × 100 = 75%)

Frequently Asked Questions

How do I calculate percentage?

To calculate a percentage, divide the part by the whole and multiply by 100. For example, to find what percentage 25 is of 200: (25 ÷ 200) × 100 = 12.5%. Our calculator does this automatically - just enter your numbers and click calculate.

How do I calculate percentage increase?

To calculate percentage increase, subtract the original value from the new value, divide by the original value, and multiply by 100. Formula: ((New - Old) ÷ Old) × 100. For example, if a price increased from $50 to $60, the increase is ((60-50)÷50)×100 = 20%.

How do I calculate percentage decrease?

To calculate percentage decrease, subtract the new value from the original value, divide by the original value, and multiply by 100. Formula: ((Old - New) ÷ Old) × 100. For example, if a price decreased from $100 to $80, the decrease is ((100-80)÷100)×100 = 20%.

What is 20% of 150?

20% of 150 is 30. To calculate this, multiply 150 by 0.20 (which is 20% as a decimal): 150 × 0.20 = 30. You can use our calculator by entering 20 in the percentage field and 150 in the value field.

How do I convert percentage to decimal?

To convert a percentage to a decimal, divide by 100. For example, 25% = 25 ÷ 100 = 0.25. An easy trick is to simply move the decimal point two places to the left: 25% → 0.25, 8.5% → 0.085.

What is the difference between percentage and percentile?

A percentage is a fraction of 100, representing a portion of a whole (e.g., 50% means half). A percentile is a statistical measure indicating the value below which a certain percentage of data falls (e.g., the 50th percentile is the median, meaning 50% of values are below it).

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

Divide the first number by the second number and multiply by 100. For example, to find what percentage 40 is of 200: (40 ÷ 200) × 100 = 20%. This tells you that 40 is 20% of 200.

Can percentages be greater than 100%?

Yes! Percentages can exceed 100%. This commonly occurs when measuring growth or comparing values. For example, if sales doubled from 50 to 100 units, that's a 100% increase. If they tripled to 150, that's a 200% increase.