Electricity Calculators
Calculate Ohm's law, electricity cost, single and three phase power, and battery run time.
- Ohm's Law Calculator
Free online Ohm's Law calculator. Calculate voltage (volts), current (amps), resistance (ohms), and power (watts) with any two known values.
- Electricity Cost Calculator
Free online electricity cost calculator. Estimate daily, monthly, and yearly power consumption in kWh and calculate energy bills based on your local.
- AC Power Calculator
AC Power Calculator — Calculate single and three-phase AC electrical power parameters, including Watts, Volt-Amperes, and Amps.
- Battery Run Time Calculator
Battery Run Time Calculator — Estimate how long your battery will last under a specific electrical load, accounting for battery chemistry and discharge ...
- Resistor Calculator
Free online resistor calculator. Calculate resistor color codes (4 and 5 bands) and series/parallel equivalent resistance values instantly.
- LED Resistor Calculator
LED Resistor Calculator — Calculate the required current-limiting resistor value and recommended wattage rating for your LED circuits.
- AWG Wire Gauge & Ampacity Calculator
AWG Wire Gauge & Ampacity Calculator — Determine American Wire Gauge (AWG) diameter, cross-sectional area, electrical resistance, and maximum NEC ampacity.
- Area to AC Calculator
Area to AC Calculator — Determine the cooling capacity your room needs. Enter the room dimensions and environmental conditions to calculate the required...
- Voltage Drop Calculator
Voltage Drop Calculator — Calculate voltage drop and percentage drop for single-phase and three-phase electrical circuits. Input the supply voltage, mat...
- Transformer Winding Calculator
Transformer Winding Calculator — Estimate transformer core cross-sectional area, turns-per-volt, primary and secondary coil turn counts, and wire sizes ...
- Motor FLA & Safety Calculator
Motor FLA & Safety Calculator — Determine motor Full-Load Amps (FLA), minimum branch circuit conductor sizes, NEMA starter sizes, and breaker/fuse ratin...
- Max Load Cable Calculator
Max Load Cable Calculator — Determine the maximum safe electrical load (Amps and kW) a cable can carry over a specified distance. Ensure the load does n...