The Reactance Calculator determines the opposition that inductors and capacitors present to alternating current in an AC circuit. Reactance is measured in ohms (Ω) and depends on frequency and the component’s properties. Inductive reactance increases with frequency and is calculated using XL=2πfLX_L = 2πfLXL​=2πfL, while capacitive reactance decreases with frequency and is found using XC=1/(2πfC)X_C = 1 / (2πfC)XC​=1/(2πfC). This calculator allows users to input frequency, inductance, or capacitance to find the corresponding reactance value, helping students, engineers, and technicians analyze AC circuit behavior efficiently in electrical and electronic systems.