Electrical calculators
Voltage, current, resistance, power and circuit relationships for basic electrical work.
Ohm's Law
Use Ohm’s law to calculate resistance from voltage and current.
Watts Volts Amps
Calculate electrical power in watts from voltage and current.
Electrical Power
Estimate real AC electrical power from RMS voltage, current and power factor.
Energy Consumption
Calculate energy consumption using labeled inputs and a transparent method.
Electricity Cost
Calculate electricity cost using labeled inputs and a transparent method.
Resistor Series
Add resistor values in series to find total series resistance.
Resistor Parallel
Calculate equivalent resistance for resistors connected in parallel.
Voltage Divider
Calculate the unloaded output of a two-resistor voltage divider.
LED Resistor
Choose the ideal series resistor for an LED from supply voltage, forward voltage and target current.
Capacitor Charge Time
Calculate capacitor charge time using labeled inputs and a transparent method.
Battery Runtime
Calculate battery runtime using labeled inputs and a transparent method.
Kilowatt Hours
Calculate kilowatt hours using labeled inputs and a transparent method.
Power Factor
Calculate power factor using labeled inputs and a transparent method.
Current Draw
Calculate current draw using labeled inputs and a transparent method.
Voltage Drop
Estimate two-way resistive voltage drop along a conductor run.
Circuit Energy
Calculate circuit energy using labeled inputs and a transparent method.
Charge
Calculate charge using labeled inputs and a transparent method.
Resistance
Calculate resistance using labeled inputs and a transparent method.