Power Calculator

Power is a measure of the amount of work that can be done in a given amount of time. Power equals work (J) divided by time (s). The SI unit for power is the watt (W), which equals 1 joule of work per second (J/s). Power may be measured in a unit called the horsepower.

DC power calculator

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

 Resistance (R): ohms (Ω) kilo-ohms (kΩ) mega-ohms (MΩ) Current (I): micro-amps (μA) milli-amps (mA) amps (A) kilo-amps (kA) mega-amps (MA) Voltage (V): micro-volts (μV) milli-volts (mV) volts (V) kilo-volts (kV) mega-volts (MV) Power (P): micro-watts (μW) milli-watts (mW) watts (W) kilo-watts (kW) mega-watts (MW)

DC power calculation

Voltage (V) calculation from current (I) and resistance (R):

V(V) = I(A) × R(Ω)

Complex power (S) calculation from voltage (V) and current (I):

P(W) = V(V) × I(A) = V 2(V) / R(Ω) = I 2(A) × R(Ω)

AC power calculator

Enter 2 magnitudes + 2 phase angles 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 ∠ ° =

AC power calculation

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) is equal to the voltage V in volts (V) times the current I in amps (A):

S(VA) = V(V) × I(A) = (|V|×|I|) ∠ ( θV - θI)

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

P(W) = V(V) × I(A) × cos φ

The reactive power Q in volt-amps reactive (VAR) is equal to the voltage V in volts (V) times the current I in amps (A) time the sine of the complex power phase angle (φ):

Q(VAR) = V(V) × I(A) × sin φ

The power factor (FP) is equal to the absolute value of the cosine of the complex power phase angle (φ):

PF = |cos φ|

Energy & power calculator

Enter 2 values to get the other values and press the Calculatebutton:

 Energy: J Time period s Average power: W

Energy & power calculation

The average power P in watts (W) is equal to the energy consumed E in joules (J) divided by time period Δt in seconds (s):

P(W) = E(J) / Δt(s)

Some Of Our Most Popular Calculators
Exponential Growth Calculator
Amps To Kva Calculator
American Wire Gauge Size Calculator
Power Factor Calculator