Electrical Home Calculators
Last updated: September 2026
Wire Gauge Calculator
Determines the minimum copper wire gauge (AWG) needed to limit voltage drop in an electrical run.
Electrical Panel Load Calculator
Estimate the total ampere demand on an electrical panel by applying NEC-style load factors to lighting, receptacle, appliance, and motor circuits, then check it against the panel's main breaker rating.
Electrical Outlet Circuit Calculator
Find out how many electrical outlets can safely share a single circuit, given the breaker size and any dedicated loads already on it.
Electrical Load Calculator
Compute the total electrical demand of a building by summing lighting, appliance, HVAC, and motor loads, then applying an NEC-compliant demand factor.
Circuit Breaker Sizing Calculator
Determine the correct circuit breaker amperage for any electrical circuit using NEC load classification rules.
Home Solar Panel Calculator
Calculate how many solar panels you need to cover your home's electricity usage based on your location's sun hours, panel wattage, and system efficiency.
Circuit Breaker Size Calculator
Determine the correctly sized circuit breaker for any electrical load, accounting for continuous versus non-continuous use, ambient temperature, and safety margins.
Conduit Fill Calculator
Calculate the percentage of conduit fill for a given wire gauge, wire count, and conduit size to ensure NEC compliance.
Home Generator Size Calculator
Determine the right generator size (in kilowatts) to keep your home's essential appliances running during a power outage.
Electricity Cost Calculator
Estimate how much any appliance costs to run daily, monthly, or annually based on its wattage, hours of use, and your utility rate.
Generator Sizing Calculator
Calculate the minimum generator wattage needed to power your home's essential loads, motors, and well pump during an outage.
Battery Backup Runtime Calculator
Estimate how many hours a battery backup system will run your devices during a power outage.
Electrical Panel Upgrade Calculator
Find out what amperage panel you need after adding new circuits, EV chargers, or major appliances.
UPS Runtime Calculator
Estimate how many minutes a UPS (uninterruptible power supply) will keep your equipment running on battery backup, based on battery capacity, connected load, and UPS efficiency.
Electrical Panel Capacity Calculator
Determine whether your electrical panel has enough remaining capacity before adding new circuits or appliances.
Electrical Power Consumption Calculator
Estimate how much electricity a device consumes and what it costs per month.
LED Savings Calculator
Find out exactly how much money you save each year by replacing incandescent or CFL bulbs with LEDs.
Appliance Energy Cost Calculator
Calculate the true annual electricity cost of any appliance using its wattage, daily usage hours, days per week, your electricity rate, and the number of units.
LED Conversion Savings Calculator
Calculate the annual electricity cost savings and CO₂ reduction you'll achieve by swapping incandescent or CFL bulbs for LEDs.
Electrical Box Fill Calculator
Calculate how many additional wires fit in an electrical junction box after accounting for installed devices.
Electric Heat Load Calculator
Estimate the electric heating power (in watts) needed to keep a room comfortable in winter.
LED Replacement Calculator
Find out how much money you save annually by switching from incandescent or CFL bulbs to LED lighting.
Voltage Drop Calculator
Calculate the percentage voltage drop along a conductor run based on current, one-way distance, wire gauge, and system voltage.
Wire Size Calculator
Find the minimum wire cross-sectional area in circular mils needed to keep voltage drop within code limits for any DC or single-phase AC circuit.
Ohm's Law Calculator
Compute voltage across a component using Ohm’s Law, V = I·R, given the current flowing through it and its resistance.