Percentage Calculator — Calculate Any Percentage Instantly
Use this free percentage calculator to solve any percentage problem. Find a percentage of a number, work out what percentage one value is of another, or calculate the percentage increase or decrease between two values. Select your mode below for an instant result.
Percentage Calculator
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How to Use the Percentage Calculator
Choose the mode that matches your calculation. Enter your values and click Calculate for an instant result with a full breakdown.
What is X% of Y — finds a percentage of any number. For example what is 20% of 150? Answer: 30.
X is what % of Y — finds what percentage one number is of another. For example 30 is what percentage of 150? Answer: 20%.
Percentage Increase — calculates the percentage growth between two values. For example from 100 to 135 is a 35% increase.
Percentage Decrease — calculates the percentage reduction between two values. For example from 200 to 150 is a 25% decrease.
The Percentage Formula
The basic formula for calculating a percentage is:
Percentage = (Part ÷ Whole) × 100
This formula is used to determine what portion one number represents compared to another.
For example, if you scored 45 points out of 60 on a test, the percentage would be calculated like this:
45 ÷ 60 × 100 = 75%
This means you achieved 75 percent of the total possible score.
Common Uses for Percentage Calculations
Percentages are used in everyday life for calculating discounts and sale prices, working out tax amounts, understanding interest rates on savings and loans, reading statistics and data, calculating tips, measuring score percentages and tracking changes over time.
FAQs
How do I calculate a percentage of a number?
Multiply the number by the percentage then divide by 100. For example 20% of 150 = 150 × 20 ÷ 100 = 30. Or simply use the What is X% of Y tab above.
How do I work out what percentage one number is of another?
Divide the part by the total then multiply by 100. For example 30 out of 150 = 30 ÷ 150 × 100 = 20%. Use the X is what % of Y tab above.
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original value and multiply by 100. For example from 100 to 135 = (135 − 100) ÷ 100 × 100 = 35% increase.
What is the difference between percentage increase and percentage decrease?
Both use the same formula. A percentage increase means the new value is higher than the original. A percentage decrease means the new value is lower.
Is this calculator free?
Yes completely free with no sign-up needed.