General purpose of this lecture is to present on How to Converting Mass to Energy. Out of the special theory of relativity comes the most famous equation in science: E=mc². This equation tells us that mass (m) is just another form of energy (E). The c² is the square of the speed of light. 1 gram of matter is equivalent to the energy obtained by burning 15,000 barrels of oil. We rearrange the protons and neutrons in nuclei to get a lower-mass configuration. The difference between initial mass and final mass is converted to energy.