Electricity Calculators
Home electricity calculators: appliance running costs, standby power drain, LED payback, AC bills, generator runtime, circuit breaker sizing, panel load, and more.
Air Conditioner Electricity Cost
Calculate your air conditioner monthly electricity cost from BTU rating, SEER or EER efficiency, daily runtime hours, and your electricity rate.
Appliance Running Cost Calculator
Calculate the daily, monthly, and annual electricity cost of any home appliance. Enter wattage, hours per day, and your utility rate to see the bill impact.
Circuit Breaker Sizing Calculator
Size a circuit breaker correctly using NEC rules. Enter load wattage, voltage, and whether the load is continuous to get the required breaker amperage.
Electric Heating Cost Calculator
Calculate the electricity cost of heating a room from room size, insulation, temperature difference, heater efficiency, and electricity rate. Shows daily and monthly costs.
Electric Water Heater Running Cost
Find the daily and annual electricity cost of your electric water heater. Enter tank size, daily usage, temperature rise, efficiency rating, and utility rate.
Electrical Panel Load Calculator
Calculate your electrical panel load and headroom. Enter panel amperage and total connected load to check utilization against the NEC 80% rule.
Extension Cord Amp Rating & Safety Check
Check if your extension cord is rated for the load. Enter AWG gauge, cord length, and device wattage to verify amp capacity and calculate voltage drop.
Generator Fuel Consumption & Runtime
Estimate generator fuel consumption and runtime from rated wattage, load percentage, fuel type, and tank size. Covers gasoline, propane, and diesel generators.
Home Battery Backup Sizing Calculator
Size a home battery backup system from essential load wattage and desired backup hours. Shows required kWh capacity and equivalent battery bank size.
LED Upgrade Payback Calculator
Calculate when an LED upgrade pays for itself. Enter old bulb wattage, LED wattage, daily hours, electricity rate, and bulb cost to find the payback period.
Peak Demand Charge Calculator
Calculate a commercial electricity bill with peak demand charges. Enter peak kW demand, demand rate, monthly kWh, and usage rate to see the cost breakdown.
Pool Pump Electricity Cost
Calculate pool pump electricity cost from motor horsepower, efficiency, daily run time, and electricity rate. Compare single-speed versus variable-speed savings.
Smart Thermostat Savings Calculator
Estimate annual heating and cooling savings from a smart thermostat setback schedule. Enter system type, setback degrees, hours per day, and monthly bill.
Standby Power Cost Calculator
Estimate the annual cost of standby power drain from devices left plugged in. Enter standby wattage, number of devices, and your electricity rate.
Time-of-Use Rate Savings Calculator
Calculate monthly electricity bill savings by shifting loads from peak to off-peak hours. Enter kWh usage, percentage shifted, and peak versus off-peak rates.