Wattsvoltsampsohms calculator
Calculate any of the four parameters (watts, volts, amps, or ohms) based on the known values using various formulas and Ohm's Law. Ideal for electrical circuit analysis and troubleshooting. Obtain accurate results for watts, volts, amps, or ohms using this versatile online tool.
What is Wattsvoltsampsohms
A WattsVoltsAmpsOhms calculator, also known as a power calculator or electrical calculator, is a tool used to perform calculations involving these electrical quantities. It allows you to calculate the missing value when given three out of the four values (Watts, Volts, Amps, Ohms) in an electrical circuit.
The relationships between these electrical quantities can be described by the following formulas:

Power (Watts) = Voltage (Volts) x Current (Amps) This formula calculates the power (in watts) based on the voltage and current in the circuit.

Power (Watts) = Current (Amps)^2 x Resistance (Ohms) This formula determines the power (in watts) based on the current and resistance in the circuit.

Voltage (Volts) = Current (Amps) x Resistance (Ohms) This formula calculates the voltage (in volts) based on the current and resistance in the circuit.

Current (Amps) = Voltage (Volts) / Resistance (Ohms) This formula determines the current (in amps) based on the voltage and resistance in the circuit.

Resistance (Ohms) = Voltage (Volts) / Current (Amps) This formula calculates the resistance (in ohms) based on the voltage and current in the circuit.
Using a WattsVoltsAmpsOhms calculator, you can input the known values and calculate the missing value by applying the appropriate formula.
For example, if you know the voltage is 120 volts, the current is 5 amps, and you want to calculate the power, you can use the first formula:
Power (Watts) = 120 V x 5 A Power (Watts) = 600 W
In this example, the power in the circuit would be 600 watts.
This type of calculator is particularly helpful in electrical engineering, circuit design, and troubleshooting scenarios where you need to determine or verify the values of power, voltage, current, or resistance in an electrical circuit.
Ohms calculations
The resistance R in ohms (Ω) is equal to the voltage V in volts (V) divided by the current I in amps (A):
The resistance R in ohms (Ω) is equal to the squared voltage V in volts (V) divided by the power P in watts (W):
The resistance R in ohms (Ω) is equal to the power P in watts (W) divided by the squared current I in amps (A):
Amps calculations
The current I in amps (A) is equal to the voltage V in volts (V) divided by the resistance R in ohms (Ω):
The current I in amps (A) is equal to the power P in watts (W) divided by the voltage V in volts (V):
The current I in amps (A) is equal to the square root of the power P in watts (W) divided by the resistance R in ohms (Ω):
Volts calculations
The voltage V in volts (V) is equal to the current I in amps (A) times the resistance R in ohms (Ω):
The voltage V in volts (V) is equal to the power P in watts (W) divided by the current I in amps (A):
The voltage V in volts (V) is equal to the square root of the power P in watts (W) times the resistance R in ohms (Ω):
Watts calculation
The power P in watts (W) is equal to the voltage V in volts (V) times the current I in amps (A):
The power P in watts (W) is equal to the squared voltage V in volts (V) divided by the resistance R in ohms (Ω):
The power P in watts (W) is equal to the squared current I in amps (A) times the resistance R in ohms (Ω):
Wattsvoltsampsohms calculator Example
Here's an example table that demonstrates how to calculate these values using different combinations:
Voltage (V)  Current (I)  Resistance (R)  Power (W) 

12V    4Ω   
24V  3A     
  5A  8Ω   
    3Ω  72W 
To calculate each value, we can use the following formulas:
 Power (W) = Voltage (V) * Current (I)
 Current (I) = Voltage (V) / Resistance (R)
 Resistance (R) = Voltage (V) / Current (I)
 Voltage (V) = Power (W) / Current (I)
Let's calculate the missing values in the table:
For the first row:
 Power (W) = 12V * (12V / 4Ω) = 36W
For the second row:
 Resistance (R) = 24V / 3A = 8Ω
 Power (W) = 24V * 3A = 72W
For the third row:
 Voltage (V) = 5A * 8Ω = 40V
 Power (W) = 40V * 5A = 200W
For the last row:
 Power (W) = 72W (given)
 Voltage (V) = 24V (calculated using Power and Current)
Please note that "" indicates a missing value in the table.
Using these formulas, you can calculate the values of watts, volts, amps, and ohms in an electrical circuit given the available information.