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Percentage Calculator

Calculate percentages, find a percentage of a number, or determine what percentage one number is of another.

Quick Examples

Select the type of percentage calculation you want to perform
Enter the percentage value (e.g., enter 20 for 20%)
Enter the number (Y in X% of Y)
Enter the result (for "Find the number" calculation)
Number of decimal places to display in the result

About This Calculator

This percentage calculator helps you solve common percentage problems quickly and easily: • Find a percentage of a number (e.g., what is 15% of 200?) • Calculate what percentage one number is of another (e.g., 30 is what percentage of 120?) • Add or subtract a percentage from a number (e.g., what is 120% of 50? or what is 80% of 50?) Percentages are used in everyday situations like calculating tips, discounts, taxes, interest rates, and statistics. This calculator handles all these common scenarios with clear results and explanations.

Frequently Asked Questions

How do I calculate a percentage of a number?

To calculate a percentage of a number, multiply the number by the percentage expressed as a decimal. For example, to find 15% of 200, multiply 200 by 0.15 (which is 15/100) to get 30.

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

To find what percentage one number (X) is of another number (Y), divide X by Y and then multiply by 100. For example, to find what percentage 30 is of 120, calculate (30 ÷ 120) × 100 = 25%.

How do I calculate the original number when I know the percentage and result?

To find the original number when you know the percentage and result, divide the result by the percentage expressed as a decimal. For example, if 15% of a number is 30, calculate 30 ÷ 0.15 = 200.

How do I calculate a discount?

To calculate a discount, multiply the original price by the discount percentage (expressed as a decimal). For example, a 20% discount on a $100 item would be $100 × 0.20 = $20. The sale price would be $100 - $20 = $80.

How do I calculate a tip?

To calculate a tip, multiply the bill amount by the tip percentage (expressed as a decimal). For example, a 15% tip on a $60 bill would be $60 × 0.15 = $9.