An Amps to Volt-Amps (VA) Calculator is an essential tool for converting electrical current (amperes) to apparent power (volt-amperes). In single-phase circuits, the apparent power (S) in volt-amperes is calculated by multiplying the current (I) in amperes by the voltage (V) in volts: S(VA) = I(A) × V(V). For three-phase circuits, the formula is S(VA) = √3 × I(A) × V(V). These calculations are crucial for accurately sizing electrical equipment such as transformers and uninterruptible power supplies (UPS). Utilizing an Amps to VA Calculator ensures efficient power distribution and optimal equipment selection in various electrical applications.