Percentage Calculator
Enter your values below and click Calculate for instant results.
%
Solve any percentage problem: find X% of Y, calculate percent change, or find what percent one number is of another.
Enter your values below and click Calculate for instant results.
A percentage is a way of expressing a number as a fraction of 100. The word itself comes from the Latin "per centum," meaning "per hundred." Percentages appear everywhere in daily life: discounts, tax rates, test scores, interest rates, nutrition labels, and statistics all use percentages as a common language for expressing proportions.
To convert a percentage to a decimal, divide by 100. To convert a decimal to a percentage, multiply by 100. So 25% equals 0.25, and 0.75 equals 75%. This conversion is the foundation of virtually every percentage calculation.
Most percentage questions fall into one of five categories, all handled by this calculator. Finding what X percent of a number equals is the most common. Finding what percent one number is of another. Calculating percent change between two values. Increasing a number by a percentage. Decreasing a number by a percentage.
These two terms are frequently confused, even in professional contexts. If an interest rate rises from 4% to 6%, that is a 2 percentage point increase, but it is a 50% increase in the rate itself. Percentage points refer to the arithmetic difference between two percentages, while percent change refers to the proportional change. This distinction matters significantly when evaluating financial data, survey results, and statistics.
Finding 10% of any number is done by moving the decimal one place to the left. From there, 5% is half of 10%, 20% is double 10%, 15% is 10% plus 5%, and 25% is one quarter of the total. For quick mental math in shopping scenarios, these shortcuts are faster than pulling out a calculator.