Percentage Calculator
Calculate percentages, percentage increase/decrease and percentage of a number.
X% of Y
Result
40
Percentage Change
Percentage increase
20%
How to Use This Calculator
1. Use "X% of Y" to find what a given percentage of a number equals.
2. Use "Percentage Change" to find the percentage increase or decrease between two values.
Formula & Explanation
X% of Y = (X / 100) × Y
% Change = [(New − Old) / Old] × 100
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Frequently Asked Questions
Divide the part by the whole and multiply by 100: (Part / Whole) × 100. For example, 20 out of 200 is (20/200) × 100 = 10%.
Subtract the old value from the new value, divide by the old value, then multiply by 100. A positive result is an increase, negative is a decrease.
The percentage change can be negative, indicating a decrease. A plain "X% of Y" calculation is always non-negative for positive inputs.
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