This free online Energy Calculator helps you quickly find kinetic energy (½mv²), potential energy (mgh), and total mechanical energy based on mass, velocity, height, and gravity. It supports multiple units such as kilograms, grams, pounds, meters, feet, and more, making it easy for both students and professionals. Simply enter your values, and the calculator provides instant results in Joules (J) and kilojoules (kJ). Use this tool for physics assignments, engineering projects, or quick energy calculations in daily applications