Percentage Calculator
Calculate percentages, percentage increase and decrease, percentage difference, and reverse percentages quickly and accurately.
Percentage Calculator
Use this free percentage calculator to solve common percentage problems instantly. Calculate a percentage of a number, find what percentage one value represents of another, measure percentage increase or decrease, calculate percentage difference, or find an original value from a known percentage.
How to Calculate Percentages
The basic percentage formula is:
Percentage = (Part ÷ Whole) × 100
What is X% of Y?
To calculate a percentage of a number, multiply the percentage by the number and divide by 100.
Example: 20% of 500 = (20 × 500) ÷ 100 = 100.
Percentage Increase
Percentage increase measures how much a value has increased compared with its original value.
Percentage Increase = ((New Value − Original Value) ÷ Original Value) × 100
Percentage Decrease
Percentage decrease measures how much a value has decreased compared with its original value.
Percentage Decrease = ((Original Value − New Value) ÷ Original Value) × 100
Common Percentage Examples
| Calculation | Formula | Result |
|---|---|---|
| 10% of 200 | (10 × 200) ÷ 100 | 20 |
| 20% of 500 | (20 × 500) ÷ 100 | 100 |
| 50 is what % of 200? | (50 ÷ 200) × 100 | 25% |
| Increase 100 by 25% | 100 × 1.25 | 125 |
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 500 is 100.
How do I calculate percentage increase?
Subtract the original value from the new value, divide the result by the original value, and multiply by 100.
How do I calculate percentage decrease?
Subtract the new value from the original value, divide by the original value, and multiply by 100.
How do I find what percentage one number is of another?
Divide the first number by the second number and multiply the result by 100.