A volts to electron-volts (eV) calculator is an essential tool for converting electrical voltage into energy measurements, particularly in fields like physics and electronics. This conversion is based on the relationship between voltage (V), electric charge (Q), and energy (E). The energy in electron-volts is calculated by multiplying the voltage in volts by the electric charge in elementary charge units (e), following the formula: E(eV) = V(V) × Q(e). For instance, applying a voltage of 1 volt to a charge of one elementary charge (approximately 1.602176634 × 10^-19 coulombs) results in an energy gain of 1 electron-volt. Utilizing a volts to eV calculator simplifies this computation, allowing users to input voltage and charge values to obtain the corresponding energy in electron-volts efficiently. This tool is invaluable for professionals and students dealing with energy conversions at the atomic and subatomic levels.