Percentage Calculator

Percentage Calculator

A free online percentage calculator to solve all percentage problems instantly. Used by students, professionals, and shoppers to calculate discounts, tips, grades, and financial percentages.

What is X% of Y?

Calculate a percentage of any number instantly.

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What is

%

of

Calculate→

For example, to calculate 20% of 50, enter 20 in the first box and 50 in the second box.

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Result =

Enter values to see result

X is Y% of What Number?

Find the original number when you know the percentage and result.

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is

%

of what?Calculate→

For example, to find what number 15 is 30% of, enter 15 in the first box and 30 in the second box. The answer is 50.

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Result =

Enter values to see result

X is What Percent of Y?

Find what percentage one number is of another.

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is what % of

?Calculate→

For example, to find what percentage 25 is of 200, enter 25 in the first box and 200 in the second box. The answer is 12.5%.

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Result =

Enter values to see result

Need other calculators? Simple Calculator • Scientific Calculator • Unit Converter

Use Cases

This percentage calculator is commonly used by students, business professionals, shoppers, and anyone who needs to calculate discounts, tips, tax amounts, grade percentages, financial ratios, or statistical proportions.

Supported Calculations

• X Percent of Y: Calculate what any percentage of a number equals (e.g., 20% of 500 = 100)
• X is Y Percent of What: Find the original number in reverse calculations (e.g., 50 is 25% of 200)
• X is What Percent of Y: Find what percentage one number is of another (e.g., 25 is 50% of 50)
• Percentage Change: Calculate percentage increases and decreases between values
• Tip Calculator: Find tip amounts and split restaurant bills
• Discount Calculator: Calculate sale prices and savings amounts

Related Guides

• Percentage Points vs Percentages - Understand the difference and avoid confusion
• Fractions to Percentages - Convert any fraction quickly

Examples

What is X% of Y:

• 20% of 500 = 100
• 15% of 80 = 12
• 75% of 200 = 150
• 8.5% of 1000 = 85

X is Y% of what:

• 50 is 25% of 200
• 30 is 10% of 300
• 75 is 50% of 150

X is what % of Y:

• 25 is 50% of 50
• 15 is 30% of 50
• 80 is 20% of 400

Percentage Change:

• 50 to 75 = 50% increase
• 100 to 80 = 20% decrease
• 200 to 250 = 25% increase

Tip Calculator:

• $50 bill with 20% tip = $10 tip
• $75 bill with 18% tip = $13.50 tip
• $100 bill with 15% tip = $15 tip

Discount Calculator:

• $100 with 25% off = $75
• $50 with 30% off = $35
• $200 with 40% off = $120

Additional Percentage Calculators

Percentage Change Calculator

Percentage Change Calculator

Calculate percentage increase or decrease between two values.

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Original Value

New Value

Calculate→

For example, if a value changed from 50 to 75, enter 50 as the original value and 75 as the new value. The result is a 50% increase.

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Result =

Enter values to see result

Tip Calculator

Tip Calculator

Calculate tip amount and total bill with tip.

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Bill Amount

$

Tip Percentage

%

Calculate→

For example, for a $50 bill with 20% tip, enter 50 as the bill amount and 20 as the tip percentage. The tip is $10 and total is $60.

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Result =

Enter values to see result

Discount Calculator

Discount Calculator

Calculate discount amount and final sale price.

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Original Price

$

Discount

%

Calculate→

For example, for a $100 item with 25% discount, enter 100 as the original price and 25 as the discount percentage. You save $25, final price is $75.

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Result =

Enter values to see result

Common Mistakes & Tips

Confusing Percentage With Decimal: Remember that 20% means 0.20 or 20/100. When calculating manually, always divide by 100.

Reversing the Order: “What is 20% of 50” is different from “50 is what % of 20”. The order matters - always identify which number is the base (total) and which is the part.

Percentage Increase vs Final Amount: When calculating a 20% increase of 100, the result is 20 (the increase), not 120 (the final amount). Add the increase to get the final value.

Using Wrong Base for Percentage Change: When calculating percentage change, always use the original value as the base, not the new value.

Frequently Asked Questions

How do you calculate percentages?

To calculate X% of Y, multiply Y by X and divide by 100. For example, 20% of 50 = (50 × 20) ÷ 100 = 10. Use our calculator for instant results without manual calculations.

What is the difference between percentage and percentile?

A percentage is a fraction out of 100, while a percentile indicates the value below which a percentage of data falls. For example, 80% means 80 out of 100, while the 80th percentile means you scored better than 80% of people.

How do I calculate a percentage increase?

Subtract the original value from the new value, divide by the original value, and multiply by 100. Formula: ((New - Original) / Original) × 100.

Can this calculator handle decimal percentages?

Yes, the calculator supports decimal percentages like 12.5%, 33.33%, or 0.5%. Enter the exact decimal value you need.

How accurate is this percentage calculator?

The calculator is highly accurate and rounds results to 5 decimal places for precision. It handles both whole numbers and decimals correctly.

What’s the fastest way to calculate a 10% tip?

Move the decimal point one place to the left. For a $45 bill, 10% = $4.50. For 15%, calculate 10% and add half of that amount. For 20%, double the 10% amount.

Related Calculators

Use our other calculation tools for more specific needs:

• X Percent of Y Calculator - Calculate percentage of any number
• X is What Percent of Y Calculator - Find percentage relationships
• X is Y Percent of What Calculator - Reverse percentage calculations
• Percentage Change Calculator - Track increases and decreases
• Tip Calculator - Calculate tips and split bills
• Discount Calculator - Find sale prices and savings
• Simple Calculator - Basic arithmetic operations
• Scientific Calculator - Advanced math functions