Percentage Calculator
Calculate percentages in three modes: percentage of a number, what percent, and percentage change.
About the Percentage Calculator
What is a Percentage?
A percentage is a number or ratio expressed as a fraction of 100. It is denoted by the symbol %. Percentages are used to compare values, calculate discounts, measure growth, and analyze data.
How to Use
Select a tab based on what you need: finding a percentage of a number, determining what percent one number is of another, or calculating percentage change between two values.
How do I calculate percentage change?
Use the formula: ((New Value - Original Value) / Original Value) × 100. A positive result indicates an increase; negative indicates a decrease.
Can I calculate discounts with this tool?
Yes. Use the "What is X% of Y?" mode. Enter the discount percentage as X and the original price as Y to find the discount amount.
Are the results accurate?
Yes. All calculations run locally in your browser using standard JavaScript math operations for full precision.
Is this calculator free?
Yes, BestCalc's percentage calculator is completely free with no ads or registration required.