Percentage Calculator
Solve common percent problems: percent of a number, percent change, and what percent one number is of another. A percentage calculator solves common percent questions like “What is X% of Y?” or “X is what percent of Y?” It’s useful for discounts, growth rates, test scores, and quick everyday math.
Inputs
%
Result
30
Formula: (percent / 100) × number
How to use it
- Choose the type of percent question (tabs).
- Enter the values you know.
- The calculator computes the missing value instantly.
- Use the explanation to double-check the logic.
Key formulas
- Percent of
- X% of Y = (X/100) × Y
- What percent
- X is what % of Y = (X/Y) × 100
- Percent change
- Percent change = ((New − Old) / Old) × 100
FAQ
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Disclaimer
Results are calculated from the numbers you enter. Double-check inputs and rounding for important decisions.