Percentage Calculator
Comprehensive percentage calculator: percent of, percent change, increase/decrease by percent.
How to Use
Enter your values in the fields above and click Calculate to get instant results. All computations run locally in your browser. No data is ever uploaded or stored.
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Advanced Percentage Calculations
This percentage calculator handles three distinct operations: "What is X% of Y?", "X is what percent of Y?", and "What is the percentage change from X to Y?" — covering the most common percentage questions that arise in daily life and professional contexts.
Practical examples: "What is 18% of 250?" = 45 (calculate tip on a restaurant bill), "37 is what percent of 200?" = 18.5% (find your test score percentage), "Percentage change from 80 to 100" = 25% increase (measure salary growth).
Percentage calculations are essential in business analytics (year-over-year growth), personal finance (investment returns), statistics (confidence intervals), and everyday shopping (discounts). When working with percentage changes, always specify the base — a "20% increase" from 100 gives 120, but a "20% increase" from 50 gives just 60. See CalcSolver's percentage helper for quick single-purpose calculations.
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Frequently Asked Questions
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. Example: What percent is 30 of 200? (30 ÷ 200) × 100 = 15%.
How do I calculate percentage increase or decrease?
Percentage change = ((New − Old) ÷ Old) × 100. If rent went from
How do I find a percentage of a number?
Multiply the number by the percentage and divide by 100. Example: 15% of 200 = 200 × 15 ÷ 100 = 30.