Here is the easy solution for How to Calculate Power. This is for electrical Power Calculator and not for mechanical power calculator.

The Power Formula in electricity, different depending on DC and AC circuits. There is a separate formula for Single Phase Circuits and Three-Phase Circuits.

The Power Calculation in AC and DC circuits differ only by Cos Pi value. (Cos pi means Power Factor).

The 3 phase Power formula differs by the 3 in a Single Phase AC circuits.

# Power Calculations in DC circuits

## If Voltage & current are known variables

## If current & Resistance are known Variables

## If Voltage & Resistance are Known Variables

# Power Calculations in Single Phase AC circuits

## If Voltage, Current & Cos Pi are Known Variables

## If Current, Resistance & Cos Pi are Known Variables

## If Voltage, Resistance & Cos pi are Known Variables

# Power Calculations in Three Phase AC circuts

## If Line Voltage, Line Current and Cos pi are known Variables

## If Phase Voltage, Phase Current and Cos pi are known Variables

## If Resistance, Current & Cos pi are Known Variables

## If Voltage, Resistance & Cos pi are Known Variables

# Cos pi

**Note : **

While entering the input use only numbers.

For example, If you are going to enter a Voltage value as 2.2kv means, enter it as 2200 v. This calculator can only take numbers as input.

The Output would be also in number format.