Calculate power, voltage or current from any two known values with unit conversions for watts, volts, amps, kilowatts and horsepower.

Power to Current Calculator

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Current From Power Formula

The following formula is used to calculate the Current From Power. 

Ifp = P / V
  • Where Ifp is the Current From Power (amps)
  • P is the power (watts) 
  • V is the voltage (volts) 

To calculate current from power, divide the power by the voltage.

Watts to Amps Conversion Table (Assumes V = 120 V, PF = 1)
Power (W) Current (A)
50.042
100.083
250.208
500.417
600.500
750.625
1000.833
1501.250
2001.667
2502.083
3002.500
4003.333
5004.167
6005.000
7506.250
10008.333
150012.500
180015.000
200016.667
300025.000
Formula: I = P ÷ V. Assumes single-phase DC/resistive load (power factor = 1) at 120 V.

How to Calculate Current From Power?

The following two example problems outline how to calculate the Current From Power.

Example Problem #1:

  1. First, determine the power (watts). In this example, the power (watts) is measured to be 5015.
  2. Next, determine the voltage (volts). For this problem, the voltage (volts) is calculated to be 40.
  3. Finally, calculate the Current From Power using the formula above: 

Ifp = P/V

Inserting the values from above and solving the equation with the imputed values gives: 

Ifp = 5015/40 = 125.375 (amps)

Example Problem #2: 

Using the same process as example problem 1, we first define the variables outlined by the formula. In this case, the values are:

power (watts) = 411

voltage (volts) = 50

Entering these values into the formula above gives : 

Ifp = 411/50 = 8.22 (amps)