What is this hub?
An electrical calculator hub groups tools for conductor sizing, voltage drop, conduit fill, generator loads, battery runtime, box fill, and common circuit formulas.
Calculator hub
Electrical Calculators.
Electrical calculators help turn loads, conductor runs, raceway sizes, and circuit values into practical planning numbers.
Why use these tools?
Electrical planning has tight limits around ampacity, voltage loss, fill percentage, startup surge, and code-driven clearances. Calculators help organize the arithmetic before final verification.
How to choose
Use wire size or ampacity tools for conductors, voltage drop for long runs, conduit and box fill for physical capacity, and generator or battery tools for backup power planning.
Available calculators
Choose a electrical tool
Wire Size Calculator
Estimate minimum wire gauge from amp load, run length, conductor material, and voltage drop.
Open calculatorConduit Fill Calculator
Check raceway fill by conduit type, trade size, conductor insulation, and conductor count.
Open calculatorGenerator Size Calculator
Estimate generator size from running load, startup surge, phase, voltage, and extra headroom.
Open calculatorBattery Charge Time Calculator
Estimate recharge time from battery capacity, charger current, chemistry, efficiency, and taper allowance.
Open calculatorBattery Backup Calculator
Estimate battery runtime or size a practical battery bank from load watts, voltage, amp-hours, inverter efficiency, and usable discharge assumptions.
Open calculatorOhm's Law Calculator
Calculate voltage, current, resistance, and power from common Ohm's law input pairs.
Open calculatorParallel Resistor Calculator
Calculate equivalent resistance for parallel resistor networks and optional branch current and power.
Open calculatorPower Factor Calculator
Calculate power factor, kW, kVA, kVAR, phase angle, and estimated current from practical electrical inputs.
Open calculatorVoltage Divider Calculator
Calculate ideal and loaded divider output voltage, current, and resistor power from practical resistor-divider inputs.
Open calculatorWire Ampacity Calculator
Calculate base and adjusted wire ampacity from conductor size, material, insulation rating, ambient temperature, and conductor count.
Open calculatorVoltage Drop Calculator
Calculate voltage drop, delivered voltage, and percent loss for copper and aluminum wire runs.
Open calculatorBox Fill Calculator
Check electrical box fill from conductor counts, wire gauge, device yokes, grounds, clamps, fittings, and box volume.
Open calculator
Common questions
Are electrical calculators a replacement for code review?
No. They are planning tools. Always verify final electrical work against the current code, local amendments, equipment labels, and a qualified electrician when required.
Which electrical tool helps with long wire runs?
Use the voltage drop calculator to estimate delivered voltage and percent loss, then compare that result with wire size and ampacity requirements.