Percentage Calculator
Calculate percentages instantly — find what % of a number is, percentage change between two values, and the percentage one number is of another.
Frequently Asked Questions
How do I calculate a percentage of a number?
To find X% of Y, multiply Y by X and divide by 100. For example, 20% of 150 = (20 × 150) ÷ 100 = 30. You can also convert the percentage to a decimal (20% = 0.20) and multiply: 0.20 × 150 = 30.
How do I calculate percentage change?
Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. If a price rises from $80 to $100, the increase is ((100 − 80) ÷ 80) × 100 = 25%. A negative result means a decrease. Use this to track price changes, growth rates, or discounts.
What is the difference between percentage and percentage points?
A percentage expresses a ratio out of 100. A percentage point is the arithmetic difference between two percentages. If interest rates rise from 3% to 5%, that is a 2 percentage-point increase — but a 66.7% relative increase. The distinction matters in finance, statistics, and everyday comparisons.