💯 Percentage Calculator

Calculate percentages, percentage increase/decrease, and percentage changes with ease.

How to Use the Percentage Calculator

Percentages are fundamental to everyday mathematics, appearing in contexts ranging from shopping discounts to financial analysis. This calculator handles common percentage computations quickly and accurately, helping you solve problems without manual calculation.

Calculating a Percentage of a Number

  1. Enter the Percentage: Input the percentage value you want to calculate (e.g., 20 for 20%).
  2. Enter the Base Number: Input the number you want to find the percentage of (e.g., 150).
  3. Calculate: Click "Calculate Percentage" to see the result. The calculator multiplies the percentage by the base number and divides by 100.

Calculating Percentage Change

  1. Enter the Original Value: Input the starting or original value (e.g., 50).
  2. Enter the New Value: Input the final or new value after change (e.g., 75).
  3. Calculate: Click "Calculate % Change" to see the percentage increase or decrease. Positive values indicate growth; negative values indicate decline.

Understanding Percentages

A percentage represents a fraction of 100. The term comes from the Latin "per centum," meaning "by the hundred." Percentages provide a standardized way to express proportions, making comparisons easier across different scales.

Common Applications: Percentages are used in sales tax calculations, tip computations, interest rates, investment returns, statistical data representation, grade calculations, and discount pricing. Mastering percentage calculations is essential for financial literacy and everyday decision-making.

Formula Reference

Percentage of a Number: (Percentage ÷ 100) × Base Number = Result

Percentage Change: ((New Value − Original Value) ÷ Original Value) × 100 = Percentage Change