Ohms Law Calculator

Calculate voltage/current/resistance/power.

Enter 2 values to get the other values and press the Calculate button:

Ohm's law calculation formula

The current I in amps (A) is equal to the voltage V in volts (V) divided by the resistance R in ohms (Ω):

I = V / R

Example 1

I = 30V / 15Ω = 2A

Example 2

I = 40V / 20Ω = 2A

So The power P in watts (W) is equal to the voltage V in volts (V) times the current I in amps (A).

P = V × I

Example 1

P = 30V × 2A = 60W

Example 2

P = 40V × 2A = 80W

AC Ohm's law calculator

Enter 2 values of magnitude+phase angle to get the other values and press the Calculate button:

Impedance (Z):
°  = 
Current (I):
Voltage (V):
Power (S):
°  = 

AC Ohm's law calculation formula

So The voltage V in volts (V) is eqaul to the current I in amps (A) times the impedance Z in ohms (Ω).

V(V) =  I(A) ×  Z(Ω) = (|I|×|Z|) ∠ (θI +  θZ)

The complex power S in volt-amps (VA):

S(VA) = (|V|×|I|) ∠ (θV -  θI)




Ohm's law ►


See also

Features of Ohms Law conversion

Our Ohms Law conversion allows the users to Calculate Ohms Law. Some of the prominent features of this utility are explained below.

No Registration

You don’t need to go through any registration process to use the Ohms Law converter. Using this utility, you can convert Ohms Law as many times as you want for free.

Fast conversion

This Ohms Law Calculator offers users the fastest conversion. Once the user enters the  Ohms Law values ​​in the input field and clicks the Convert button, the utility will start the conversion process and return the results immediately.

Saves Time and Effort

The manual procedure of Calculator Ohms Law isn’t an easy task. You must spend a lot of time and effort to complete this task. The Ohms Law Calculator allows you to complete the same task immediately. You will not be asked to follow manual procedures, as its automated algorithms will do the work for you.


Despite investing time and effort in manual Calculation, you might not be able to get your hands on accurate results. Not everyone is good at solving math problems, even if you think you're a pro, there's still a good chance you'll get in accurate results. This situation can be smartly handled with the help of a Ohms Law Calculator. You will be provided with 100% accurate results by this online tool.


The online Ohms Law converter perfectly works on all operating systems. Whether you have a Mac, iOS, Android, Windows, or Linux device, you can easily use this online Tool without facing any hassle.

100% Free

You don't need to go through any registration process to use this Ohms Law Calculator. You can use this utility for free and do unlimited Ohms Law conversions without any limitations.


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