Online Power Analyzer

Calculate real power, reactive power, apparent power, and power factor from voltage, current, and power factor inputs.

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About This Tool

This online power analyzer tool helps you perform essential electrical power calculations for AC circuits. Simply input the voltage (in volts), current (in amperes), and power factor (between 0 and 1), and select your calculation type. The tool instantly calculates real power (active power in watts), reactive power (in volt-amperes reactive), apparent power (in volt-amperes), and power factor. It's perfect for engineers, students, and professionals working with electrical systems, energy analysis, or power quality assessment. All calculations are performed client-side for instant results without server delays.

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How to Use

Enter the voltage value in volts (e.g., 120V).
Enter the current value in amperes (e.g., 5A).
Enter the power factor value between 0 and 1 (e.g.,
.
Select the calculation type from the dropdown (Real Power, Reactive Power, Apparent Power, or Power Factor).
Click the 'Calculate Power' button to see the results.
View all calculated values including real power, reactive power, apparent power, and power factor in the results section.

Frequently Asked Questions

Find Quick Answers

What is the difference between real power, reactive power, and apparent power?

Real power (active power) is the actual power consumed by resistive loads, measured in watts. Reactive power is the power exchanged between inductive/capacitive components, measured in VAR. Apparent power is the vector sum of real and reactive power, measured in VA.

What is power factor and why is it important?

Power factor is the ratio of real power to apparent power, ranging from 0 to 1. It indicates how effectively electrical power is being used. A low power factor means poor utilization and can lead to higher energy costs and system inefficiencies.

Can I use this tool for three-phase power calculations?

This tool is designed for single-phase AC power calculations. For three-phase systems, you would need to use appropriate formulas that account for phase relationships and line/phase voltages.

What units does this tool use?

Voltage is in volts (V), current in amperes (A), real power in watts (W), reactive power in volt-amperes reactive (VAR), apparent power in volt-amperes (VA), and power factor is unitless (between 0 and 1).

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