wa In wa

Adblocker Detected

Uh Oh! It seems you’re using an Ad blocker!

We always struggled to serve you with the best online calculations, thus, there's a humble request to either disable the AD blocker or go with premium plans to use the AD-Free version for calculators.

Disable your Adblocker and refresh your web page 😊

ohms law Calculator

Ohms Law Calculator

Enter any two of the following values and the calculator will readily calculate the voltage, current, power, and resistance of the electrical circuit.


Voltage(V) = Current(I) * Resistance(R)

Power(P) = Voltage(V) * Current(I)

Note: Just enter any two values.









Get The Widget!


Add Ohm's Law Calculator to your website through which the user of the website will get the ease of utilizing calculator directly. And, this gadget is 100% free and simple to use; additionally, you can add it on multiple online platforms.

Available on App

Download Ohms Law Calculator App for Your Mobile, So you can calculate your values in your hand.


At this platform of calculator-online, you can find out en efficient tool known as ohms law calculator. Yes, this ohm calculator concerning the ohm’s law equation that was derived by the Georg Simon Ohm in 1827.

Well, before knowing more about our ohms law calculator, let’s we tell you about what is ohm’s law.

What Is Ohms Law?

In 1827, the mathematical law of electric current was derived by the Bavarian physicist Georg Simon Ohm. It is the most fundamental law that defines the relationship between the current (I), resistance (R), voltage (V), and power (P). More specifically, ohm’s law defined that the current (I) through a conductor between two points is directly proportional to the voltage (V), and is inversely proportional to the resistance (R).

Ohm’s Law Formula:

The Bavarian physicist Georg Simon Ohm derived a formula in which the resistor’ current (I) in amps (A) = (is equal) to the resistor’s voltage (V) in volts divided by the resistance R in ohms (Ω):

Ohm’s law formula is stated as:

Current (I) = (Voltage,(V))/(Resistance,(R)) in Amperes, (A)

How to find current becomes easy with our simple ohms law calculator concerning formula for current.

Ohm’s Law Calculator:

The team of a calculator-online provided a simple and efficient tool known as “ohms law calculator” through which you can readily find out the value of voltage (V), current (I), power (P), and resistance (R) concerning simple ohm’s law formula.

However, two of these values should have to be known to figure out the remaining two values.

Hence, remember that you will get the results concerning the standard units that you selected!

How Our Ohm’s Law Calculator Works?

There is no need to stick on certain mathematical calculations to determine the value of voltage (V), current (I), power (P), and resistance (R). Our ohms calculator does all for you within a couple of seconds. Our ohms law calculator is not only convenient to use, but it also works efficiently! Let’s take a look!

  • In the above ohms law calculator, you can find four fields of Voltage (V), Current (I), Resistance (R), and Power (P), respectively
  • You just have to enter any two of these values concerning their SI units
  • Once you selected two values and their SI units, then you just have to press the calculate button to get the remaining two values

As mentioned above, you will get your outcomes concerning the SI units that you select before calculating!

Ohm’s Law Equation:

Ohms law derived that the amount of current (I) through a metal conductor in a circuit is directly proportional to the voltage (V) impressed across it, for respective temperature. Georg Simon Ohm expressed his discovery in the form of a simple ohm’s law equation that describes how voltage, current, and resistance interrelate:

V = IR

In this ohms law equation – voltage (V) is equal to the current (I) multiplied by resistance (R). Well, using this ohm’s law equation manipulate into two variations, solving for current (I) and resistance (R), respectively:

I = E/R and R = E/I

How To Calculate Current?

Our ohms law calculator also works as a current calculator as it concerns a simple current formula. When a voltage (V) and resistance are given, then you ought to use a formula for current. You can calculate current using the given formula!

Current Formula:

[Current (I) = Voltage (V) ÷ Resistance (R) ] I (amps) = V (volts) ÷ R (Ω)

For Example:

Find the current flowing through a 3 Ω resistor when a potential difference of 30 V is applied across it.

Solution: Current (I) = V ÷ R; I = 30 V ÷ 3 Ω; I = 10 A

How To Calculate Resistance?

An ohm law calculator is also referred to as a resistance calculator as it helps you to calculate resistance. When a voltage (V) and current (I) are given, you can find out resistance using a simple formula for resistant.

Resistance Formula:

[Resistance (R) = Voltage (V) ÷ Current (I) ] R (Ω) = V (volts) ÷ I (amps)

For Example:

Find the value of unknown resistor which drops 5 V when 20 mA current is flowing through it.

Solution: Resistance (R) = Voltage (V) ÷ Current (I) amps; R = 5 V ÷ 20 mA; R = 250 Ω

How To Calculate Voltage?

The above ohm’s law calculator is reliable to do so! When current and resistance are known, you can easily find out the voltage using a simple voltage formula:

Voltage Formula:

[Voltage (V) = Current (I) x Resistance (R)] V (volts) = I (amps) x R (Ω)

For Example:

Find the voltage applied across 15 kΩ resistors when 10 mA current flows through it.

Solution: Voltage (volts) = Current (amps) x Resistance (Ω); V = 10 mA x 15 kΩ; V = 150 V

How To Calculate Power?

The above calculator will help you to calculate the power using a simple power formula. If voltage and current are given, then you can easily calculate the value of the power.

Power Formula:

Power (P) = Voltage (V) * Current (I)

For Example:

If the application of 15 Voltage potential drop across a resistor results in 10 mA current flowing through it, then how to evaluate the power dissipated across it.

Solution: P = V * I; P = 15 V * 10 mA; P = 0.15 W

Well, know it’s time to know about Limitations of ohms law. Before installing the various appliances in your home, test the overall capacity or resistance of the whole circuit. Then install the appliance, this would save the cost of the electricity and you can avoid the short circuiting.

Limitations Of Ohms Law:

  • Keep in mind, ohm’s law cannot be applied to unilateral networks – These networks contains unilateral elements including diode, transistors, etc., means these elements do not have same voltage-current relation for both directions of current
  • Optimistic studies reveal that the ohm’s law is not applied to non-linear elements – these are the elements that do not have current exactly proportional to the applied voltage, which means the resistance value of these elements changes for different values of voltage and current. The examples of the non-linear elements are thyristor, electric arc, etc

Final Words By Calculator-Online:

Our ohms law calculator is a straightforward tool that utilizes simple ohm’s law formula to find out Voltage (V), Resistance (R). Current (I), and Power (P).


Other Languages: Ohms Lov Lommeregner, Ohmsches Gesetz Rechner, Ohmin Laki Laskuri, Strømkalkulator, Kalkulator Ampere Watt, Расчет Мощности, Ohm Hesaplama, Prawo Ohma Kalkulator, Calculadora Lei De Ohms, حساب قانون أوم, Calculateur Loi D’ohm, Calculadora Ley De Ohm, Calcolatore Ohm, オームの法則 計算, Ohmův Zákon Kalkulačka, 옴의 법칙 계산자