The Transformer Efficiency Calculator determines how efficiently a transformer converts electrical power from the primary side to the secondary side using the formula Efficiency=PoutPin×100\text{Efficiency} = \frac{P_{out}}{P_{in}} × 100Efficiency=Pin​Pout​​×100. Here, PinP_{in}Pin​ is the input power supplied to the transformer, and PoutP_{out}Pout​ is the output power delivered to the load. The result is expressed as a percentage that indicates how much of the input power is successfully converted into useful output power. This calculator is a valuable tool for engineers and students to analyze transformer performance, energy losses, and overall power transfer efficiency.