Converting hertz (Hz) to terahertz (THz) involves understanding that one terahertz equals one trillion hertz (1 THz = 10¹² Hz). Therefore, to convert hertz to terahertz, divide the frequency value in hertz by 10¹². For example, 500 billion hertz (500,000,000,000 Hz) is equal to 0.5 terahertz (500,000,000,000 Hz ÷ 10¹² = 0.5 THz). This conversion is essential in fields like spectroscopy and telecommunications, where precise frequency measurements are crucial. Utilizing online calculators can simplify this process, ensuring accurate and efficient conversions.