The Radiation Energy Calculator computes the energy of a photon using Planck’s equation E=h⋅fE = h \cdot fE=h⋅f, where hhh is Planck’s constant (6.626×10−346.626 \times 10^{-34}6.626×10−34 J·s) and fff is the frequency of the radiation. By entering either frequency or energy, the calculator determines the unknown. This tool is useful for physics students, quantum mechanics studies, and understanding the energy of electromagnetic radiation.