AC Voltage Calculator

Calculate voltage, current, resistance, and power in AC circuits.

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Features

AC Circuit Analysis

Calculate Voltage (V), Current (I), and Impedance (Z) using AC Ohm's Law.

Power Factor Correction

Input Power Factor (0-1) to accurately calculate Real, Apparent, and Reactive power.

Smart Input Detection

Enter any two known values, and the calculator automatically solves for the rest.

Complete Power Triangle

Get a full breakdown of Real Power (W), Apparent Power (VA), and Reactive Power (VAR).

Error Prevention

Validates inputs to ensure physically possible circuit parameters.

Instant Reset

One-click reset to quickly start a new analysis.

About AC Voltage Calculator

Our AC Voltage Calculator is a comprehensive tool designed for electrical engineers, students, and technicians working with Alternating Current (AC) circuits. Unlike simple DC calculators, this tool accounts for the complexities of AC power, including Power Factor (PF), Real Power (P), Apparent Power (S), and Reactive Power (Q). It automatically applies Ohm's Law for AC circuits and power formulas to help you analyze circuit performance, size components correctly, and understand the relationship between voltage, current, and impedance.

How to Use AC Voltage Calculator

  • 1
    Enter Known Values

    Input at least two parameters (e.g., Voltage and Current, or Power and Impedance).

  • 2
    Set Power Factor

    Adjust the Power Factor if known (default is 1.0 for purely resistive loads).

  • 3
    View Results

    Instantly see calculated values including the full power analysis (Real, Apparent, Reactive).

  • 4
    Analyze & Reset

    Review the results for circuit sizing or analysis, then use Reset for a new calculation.

Frequently Asked Questions

It is a measure of electrical efficiency (0 to 1). A power factor of 1.0 means the energy is used perfectly for work; lower values indicate wasted reactive power.
Watts represent Real Power (the actual work done), while Volt-Amps represent Apparent Power (the total power supplied to the circuit).
Yes, standard AC electrical calculations use Root Mean Square (RMS) values for voltage and current as they represent the equivalent DC value for power delivery.
It is the power that oscillates between the source and the load without performing work, typically caused by inductors and capacitors.
Impedance (Z) is the total opposition to current in an AC circuit, calculated as Z = V / I, and it includes both resistance and reactance.
Alternating Current reverses direction periodically, usually in a sine wave, at a specific frequency like 50Hz or 60Hz depending on your country.