Percentage Calculator
Calculate the percentage of a number, percentage increase or decrease, percentage ratio, and percentage change between two values.
Percentage value = number × rate / 100
Calculation is based on basic percentage mathematics. No official rate, legislation, or external data is used.
What this percentage calculator covers
This calculator finds the percentage of a number, increases or decreases a value by a percentage, calculates what percent A is of B, and shows percentage change between two values.
- Percentage value = number × rate / 100
- Percentage ratio = A / B × 100
- Percentage change = (new - old) / old × 100
Percentage increase vs decrease
Percentage increase adds the percentage value to the original number, while percentage decrease subtracts it. Percentage change compares a new value against an old value.
Frequently Asked Questions
How do you calculate what percentage A is of B?
Divide A by B and multiply by 100. The formula is: (A / B) × 100.
How do you calculate a percentage increase?
First find the percentage value of the base number, then add it to the base number: Base + (Base × Rate / 100).
How do you find the percentage change between two numbers?
Divide the difference between the new and old value by the old value and multiply by 100: ((New - Old) / Old) × 100.
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