Percentage Calculator
Calculate any percentage instantly — find what percent of a number, calculate percentage change, add or subtract a percentage, and more with 6 powerful calculation modes.
How to Use the Percentage Calculator
- 1Select the calculation mode that matches what you need to find. There are 6 modes covering every common percentage calculation.
- 2Enter your numbers in the input fields. All fields are pre-filled with example values so you can see how the calculator works immediately.
- 3Click Calculate to see your result with a full step-by-step breakdown and a quick reference table showing all 6 calculation types at once.
- 4Download the free PDF report to save your calculation for reference.
Example Calculations
- Mode 1: 15% of 200 = 30
- Mode 2: 30 is 15% of 200
- Mode 3: 80 to 100 = 25% increase
- Mode 4: 30 is 15% of 200
- Mode 5: 150 + 20% = 180 (added 30)
- Mode 6: 150 - 20% = 120 (subtracted 30)
Frequently Asked Questions
How do I calculate what percentage one number is of another?
Divide the smaller number by the total and multiply by 100. For example 30 out of 200 is calculated as 30 divided by 200 times 100 which equals 15%. This is the most common percentage calculation used for test scores grades discounts and tax rates.
How do I calculate a percentage increase or decrease?
Subtract the original value from the new value divide by the original value and multiply by 100. For example going from 80 to 100 is a 25% increase because 100 minus 80 equals 20 divided by 80 times 100 equals 25. If the result is negative it is a decrease.
How do I add a percentage to a number?
Multiply the number by 1 plus the percentage divided by 100. For example adding 20% to 150 is calculated as 150 times 1.20 which equals 180. This is commonly used for calculating prices after a markup tips on restaurant bills and salary increases.
How do I subtract a percentage from a number?
Multiply the number by 1 minus the percentage divided by 100. For example subtracting 20% from 150 is calculated as 150 times 0.80 which equals 120. This is used for calculating sale prices after a discount tax deductions and price reductions.
What is the difference between percentage and percentage points?
A percentage is a ratio expressed out of 100. A percentage point is the arithmetic difference between two percentages. For example if an interest rate rises from 3% to 5% it has increased by 2 percentage points but has increased by 66.67% as a percentage change. This distinction is important in finance economics and statistics where the two terms are often confused.