Percentage Calculator
Calculate percentages instantly. Find X% of a number, what percent X is of Y, and percent change between two values.
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Percentage of Value
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X is what % of Y —
Percent Change —
How to Use This Calculator
Enter a Value and a Percentage to find that percentage of the value. Use the Advanced fields to find what percent X is of Y, or to calculate percent change between two values.
Formula
P% of V = (P / 100) × V
X is what % of Y = (X / Y) × 100
% Change = ((New − Old) / |Old|) × 100
Example
15% of 200 = 30 • 30 is 15% of 200 • 80 to 100 = +25% change
Frequently Asked Questions
- Multiply 200 by 0.15 (15/100) = 30. Our calculator does this automatically.
- Percent change = ((New − Old) / |Old|) × 100. A positive result means an increase; negative means a decrease.
- Divide the part by the whole and multiply by 100. Example: 30 is what % of 200? → (30/200)×100 = 15%.
- Percentage points are the arithmetic difference between two percentages. Going from 10% to 15% is a 5 percentage-point increase but a 50% relative increase.
- Use the percent change formula: ((New − Old) / Old) × 100. If the result is positive it is an increase; if negative it is a decrease.