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Percentage Calculator

Calculate percentages quickly and easily. Find what percent one number is of another, calculate percentage increase or decrease, and more.

Basic Percentage Calculator

Find what percent one number is of another. For example, what percent is 25 of 200?

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Percentage of a Number

Calculate a percentage of a given number. For example, what is 15% of 200?

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Percentage Change Calculator

Calculate the percentage increase or decrease between two values.

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Tip Calculator

Calculate how much to tip based on your bill amount and desired tip percentage.

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Tip Amount:
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Total Bill:
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Per Person:
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How to Use the Percentage Calculator

Basic Calculator

Find what percent one number is of another. Enter two values and get the percentage.

Example: What percent is 25 of 200?
Answer: 12.5%

Percentage of a Number

Calculate a specific percentage of a given number.

Example: What is 15% of 200?
Answer: 30

Percentage Change

Calculate the percentage increase or decrease between two values.

Example: Change from 100 to 120?
Answer: 20% increase

Tip Calculator

Calculate how much to tip based on your bill amount and desired percentage.

Example: 20% tip on $50 bill?
Answer: $10 tip, $60 total

Percentage Formulas

Basic Percentage Formula

Percentage = (Value / Total Value) × 100

This formula calculates what percent one number is of another.

Percentage of a Number

Result = (Percentage / 100) × Number

This formula calculates a specific percentage of a given number.

Percentage Change

Percentage Change = ((New Value - Original Value) / Original Value) × 100

This formula calculates the percentage increase or decrease between two values.

Tip Amount

Tip Amount = Bill Amount × (Tip Percentage / 100)

This formula calculates how much to tip based on the bill amount and tip percentage.

Frequently Asked Questions

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

To calculate what percent one number is of another, divide the first number by the second number, then multiply by 100. For example, to find what percent 25 is of 200: (25 ÷ 200) × 100 = 12.5%.

How do I calculate a percentage of a number?

To calculate a percentage of a number, convert the percentage to a decimal by dividing by 100, then multiply by the number. For example, to find 15% of 200: (15 ÷ 100) × 200 = 0.15 × 200 = 30.

How do I calculate percentage increase or decrease?

To calculate percentage change, subtract the original value from the new value, divide by the original value, then multiply by 100. If the result is positive, it's an increase; if negative, it's a decrease. For example, to find the percentage change from 100 to 120: ((120 - 100) ÷ 100) × 100 = 20% increase.

What is a good tip percentage?

Tipping customs vary by country and service type, but in many places, 15-20% is standard for good service at restaurants. For exceptional service, 20-25% may be appropriate. In the U.S., 15% is typically considered the minimum for standard service, 18% for good service, and 20%+ for excellent service.