Power Calculators
These power calculator tools cover AC and DC power, real and reactive power, power factor, capacitor energy, and power-unit conversions.
mAh to Wh Calculator
This mAh to Wh calculator converts a battery’s milliamp-hour capacity into energy in watt-hours (and kWh)…
Open calculator PowerLuminous Flux Calculator
This luminous flux calculator finds the total luminous flux in lumens from a source’s intensity in…
Open calculator PowerReal and Reactive Power Calculator
This real and reactive power calculator relates real power (P), reactive power (Q), and apparent power…
Open calculator PowerDC Power Calculator
This DC power calculator finds the power in a DC circuit from voltage, current, or resistance.…
Open calculator PowerAC Power Calculator
This AC power calculator finds the real, apparent, and reactive power of a single-phase AC load…
Open calculator PowerCopper Loss Calculator
This copper loss calculator finds the resistive (I²R) power loss in a winding, the main load…
Open calculatorCapacitor Energy & RC Time Constant Calculator
This RC time constant calculator finds the RC time constant and the energy stored in a…
Open calculator PowerHorsepower to Watts Converter
This horsepower to watts calculator converts HP to watts and watts back to HP. Enter a…
Open calculator PowerkW to HP Converter
This kW to HP converter changes kilowatts to horsepower and horsepower back to kilowatts. Enter a…
Open calculator PowerPower Factor Calculator
This power factor calculator finds the power factor from real and apparent power, or from voltage…
Open calculator PowerkVA to Amps Calculator
This kVA to amps calculator converts apparent power in kVA to current in amps for single-…
Open calculatorAbout Power Calculators
These power calculator tools cover AC and DC power, real and reactive power, power factor, capacitor energy, and power-unit conversions. Pick a tool below for an instant result with its formula and a worked example.
Each tool applies the standard power equation and defines every variable, so the result is easy to check and reuse.
Calculators in this category
- AC Power Calculator
- DC Power Calculator
- Real and Reactive Power Calculator
- Power Factor Calculator
- Copper Loss Calculator
- mAh to Wh Calculator
- kVA to Amps Calculator
- Horsepower to Watts Converter
- kW to HP Converter
- Capacitor Energy & RC Time Constant Calculator
- Luminous Flux Calculator
Frequently Asked Questions
What can I calculate with these power tools?
AC and DC power, real and reactive power, power factor, kVA to amps, horsepower to watts, and capacitor energy. Each tool covers one task with its formula.
Are these tools free to use?
Yes. Every calculator on this page is free, needs no signup, and works in your browser on mobile and desktop.
Do the tools show the equation?
Yes. Each page states the formula, defines the inputs, and gives a numeric example so you can verify the result by hand.