Percentage Calculator
Calculate percentages three ways: percent of a number, what percent one number is of another, and percent change between two values.
How to use this calculator
- 1Enter your values or expression in the fields above.
- 2Press Enter or click the calculate button.
- 3Read the result, then follow the numbered step-by-step working to understand each stage.
Worked Examples
Frequently Asked Questions
How do I calculate percentage?
Percentage = (part / whole) × 100. To find x% of n: (x/100) × n.
How is percent change calculated?
((new - old) / old) × 100. Positive means increase, negative means decrease.
Related Calculators
Learn the concepts
Understand the theory behind this calculator.
Percentages
A percentage expresses a number as a fraction of 100. It is used everywhere in daily life — discounts, interest, statistics.
Fractions
A fraction represents a part of a whole. It consists of a numerator (top) and denominator (bottom). Understanding fractions is foundational for all higher mathematics.
Decimals
Decimals are another way to represent fractions, using place values based on powers of 10.
Ratios
A ratio compares two or more quantities. Ratios can be written as a:b, a/b, or "a to b".