Converting terahertz (THz) to hertz (Hz) is straightforward: 1 terahertz equals 1 trillion hertz (1 THz = 10¹² Hz). To perform the conversion, multiply the terahertz value by 1,000,000,000,000. For example, 3 THz equals 3,000,000,000,000 Hz. Conversely, to convert hertz to terahertz, divide the hertz value by 1,000,000,000,000. For instance, 5,000,000,000 Hz equals 0.005 THz. These conversions are essential in fields like telecommunications and physics, where precise frequency measurements are crucial.