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Volts to amps calculator FullScreen

Convert voltage in volts (V) to electrical current in amperes (A). Ideal for understanding the current requirements of electrical systems and devices. Obtain an estimation of amperes from volts using this practical online tool.

Select calculation:  
Enter volts: V
Enter watts: W
Result in amps: A


What is Volts to amps calculator

To convert volts (V) to amps (A), you need to know the resistance (R) or the power (P) of the electrical circuit. The formulas for converting volts to amps are as follows:

  1. Amps (A) = Volts (V) / Resistance (R) This formula is used when you know the voltage and resistance values of the circuit.

  2. Amps (A) = Watts (P) / Volts (V) This formula is used when you know the power and voltage values of the circuit.

Simply divide the voltage by the resistance to obtain the current, or divide the power by the voltage to get the current.

For example, if you have a circuit with a voltage of 120 volts (V) and a resistance of 10 ohms (Ω), you can calculate the current in amps as follows:

Amps (A) = 120 V / 10 Ω Amps (A) = 12 A

In this example, the current flowing through the circuit would be 12 amps.

Please note that the relationship between volts and amps depends on the specific characteristics of the circuit, such as resistance or power. Additionally, in circuits with complex loads or components like capacitors or inductors, the relationship may involve considerations of reactance and impedance.

Volts to amps calculation

The current I in amps (A) is equal to the power P in watts (W), divided by the voltage V in volts (V):

I(A) = P(W) / V(V)

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

I(A) = V(V) / R(Ω)

Volts to amps calculator Example

Voltage (V) Resistance (R) Current (I)
12V 3A
24V 3A
9V 3A
6V 3A
15V 3A

To calculate the current (I) in a circuit, you can use Ohm's Law:

I = V / R


  • I is the current in amperes (A)
  • V is the voltage in volts (V)
  • R is the resistance in ohms (Ω)

For example, if you have a voltage of 12V and a resistance of 4Ω, you would calculate the current as follows:

I = 12V / 4Ω I = 3A

So, for the given voltage and resistance, the current is 3A.

This table provides examples of different voltage and resistance combinations with a constant current of 3A. You can use Ohm's Law to calculate the current for other voltage and resistance values using the formula mentioned above.