Percentage Calculator
Calculate percentages with multiple modes: percent of, what percent, percent change, and increase/decrease.
Frequently Asked Questions
What calculation modes are available?
There are four modes: "X% of Y" calculates a percentage of a number, "X is what % of Y?" finds what percentage one number is of another, "% change from X to Y" calculates percent change between two values, and "% increase/decrease" applies a percentage to increase or decrease a value.
How is percentage change calculated?
Percentage change is calculated as ((New Value - Old Value) / |Old Value|) × 100. A positive result means an increase, while a negative result means a decrease. For example, going from 80 to 100 is a 25% increase.
What is the difference between percentage change and percentage increase?
Percentage change calculates the difference between two known values. Percentage increase/decrease starts with a value and a percentage, then calculates the new value. For example, "200 increased by 15%" gives 230.
Can I enter decimal numbers?
Yes, all inputs accept decimal numbers. You can enter values like 15.5, 200.75, or 0.5 for precise calculations.
How are results rounded?
Results are displayed with up to 6 decimal places for precision, but trailing zeros are removed for cleanliness. Very large or very small numbers are handled accurately.