Ohm's law free online calculator

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

Resistance (R):
	ohms (Ω) kiloohms (kΩ) megaohms (MΩ)
Current (I):
	microamps (μA) milliamps (mA) amps (A) kiloamps (kA) megaamps (MA)
Voltage (V):
	microvolts (μV) millivolts (mV) volts (V) kilovolts (kV) megavolts (MV)
Power (P):
	microwatts (μW) milliwatts (mW) watts (W) kilowatts (kW) megawatts (MW)
Calculate Reset

AC Ohm's law calculator

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

Impedance (Z):
	Ω kΩ MΩ	∠		°	=
Current (I):
	μA mA A kA MA	∠		°
Voltage (V):
	V kV MV	∠		°
Power (S):
	VA kVA MVA	∠		°	=
Calculate Reset

Ohm's law formula

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

V_(V) = I_(A) × R_(Ω)

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

P_(W) = V_(V) × I_(A)

AC Ohm's law formula

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|) ∠ (θ_I + θ_Z)

The complex power S in volt-amps (VA) is equal to the voltage V in volts (V) times the current I in amps (A):

S_(VA) = V_(V) × I_(A) = (|V|×|I|) ∠ (θ_V - θ_I)

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