The Percentage Change Calculator is a free online tool that helps you find the percentage increase or decrease between two values. Simply enter the old value and the new value, and the calculator will instantly show the percentage change with accurate results. This tool is highly useful for students, teachers, business owners, and professionals in finance or data analysis who need to quickly calculate changes over time. Whether you are comparing prices, tracking growth, or analyzing statistics, this calculator provides clear and reliable results on both desktop and mobile devices.