Electricity Calculators
Explore transparent electrical and energy estimates for learning and planning. Consult a qualified electrician or engineer for real-world electrical work.
Ohm's Law Calculator
Calculate voltage, current or resistance with Ohm's law.
Watts to Amps Calculator
Estimate current from power, voltage and power factor.
Amps to Watts Calculator
Estimate power in watts and kilowatts from current and voltage.
Electricity Cost Calculator
Estimate energy use and electricity cost over a selected period.
Battery Runtime Calculator
Estimate battery runtime from Wh or Ah capacity and load power.
Voltage Drop Calculator
Explore a simplified voltage-drop estimate from stated conductor resistance.
Resistor Color Code Calculator
Decode 4-band and 5-band resistor values and tolerance ranges.
Power Factor Calculator
Calculate power factor and reactive-power magnitude from kW and kVA.
kWh Calculator
Calculate energy in kWh and Wh from power and operating time.
Solar Panel Calculator
Estimate theoretical solar array size and panel count.