Appliance energy use, power conversion, and electricity cost calculators. Browse our free electricity tools below — all calculators are instant, accurate, and require no sign-up.
AC Cost per Hour Calculator — Find out how much your air conditioner costs to run per hour. Enter AC wattage and electricity rate for instant cost estimates.
Amps to Watts Calculator — Convert amps to watts instantly. Enter amperage, voltage, and power factor for accurate watt conversion for both AC and DC circuits.
Appliance Energy Use Calculator — Calculate how much energy any appliance uses and what it costs to run. Enter wattage, hours of daily use, and your electricity rate.
Battery Backup Time Calculator — Calculate how long a battery will power your load. Enter battery Ah, voltage, depth of discharge, and load watts to find backup time in hours.
Dryer Cost per Load Calculator — Calculate how much it costs to run your dryer per load. Enter kWh per cycle and electricity rate to find per-load and annual drying costs.
Dishwasher Cost per Cycle Calculator — Calculate the electricity and water cost per dishwasher cycle. Compare running costs to hand washing and find annual dishwashing expenses.
Electric Water Heater Cost Calculator — Calculate the annual cost of running an electric water heater. Enter daily kWh usage and electricity rate to estimate annual hot water expenses.
EV Home Charging Cost Calculator — Calculate the cost of charging your electric vehicle at home. Enter battery size, charger efficiency, and electricity rate for per-charge and monthly costs.
EV Station Charging Cost Calculator — Calculate the cost of charging your electric vehicle at a public charging station. Enter kWh delivered and station rate for per-session and per-mile costs.
Freezer Annual Cost Calculator — Calculate the annual electricity cost of running a standalone freezer. Enter the annual kWh rating and your electricity rate for instant cost estimates.
Heat Pump Water Heater Cost Calculator — Estimate the annual cost of running a heat pump water heater. Compare energy-efficient heat pump costs against standard electric and gas water heaters.
kVA to kW Calculator — Convert kVA to kW using power factor. Size generators, transformers, and switchgear by finding real power capacity from kVA nameplate ratings.
Hot Tub Cost Calculator — Calculate the monthly electricity cost of running a hot tub. Enter heater kW, pump kW, daily run hours, and rate for accurate hot tub energy costs.
LED vs Incandescent Savings Calculator — Compare the running cost of LED and incandescent bulbs. See how much you save annually by switching to LED lighting in your home.
kWh Cost Calculator — Calculate the cost of electricity usage in kilowatt-hours. Enter your kWh consumption and utility rate to find your total energy cost instantly.
Lighting Cost Calculator — Calculate the total cost of running all your light fixtures. Enter total fixture wattage, hours of use, and electricity rate for a full lighting cost estimate.
Pool Pump Cost Calculator — Calculate the electricity cost of running a swimming pool pump. Enter pump horsepower, daily run hours, and electricity rate for monthly and annual costs.
Power Factor Correction Calculator — Calculate the kVAR capacitor needed for power factor correction. Enter current and target power factors with kW load to find required capacitance.
Refrigerator Annual Cost Calculator — Calculate the annual electricity cost of your refrigerator. Enter annual kWh from the EnergyGuide label and your rate to see yearly and monthly costs.
Single-Phase Power Calculator — Calculate single-phase electrical power from voltage, current, and power factor. Find watts, amps, or volts for residential and light commercial circuits.
Space Heater Cost Calculator — Calculate how much it costs to run a space heater per hour, day, month, or year. Enter wattage, usage hours, and electricity rate.
Standby Power Cost Calculator — Calculate the annual cost of standby (phantom) power for devices left plugged in. Find out how much vampire energy drains from your wallet each year.
Three-Phase Power Calculator — Calculate three-phase electrical power. Enter voltage, current, and power factor to find watts, kW, and kVA for balanced three-phase circuits.
UPS Runtime Calculator — Calculate how long a UPS will power your equipment. Enter battery watt-hours, efficiency, and load to find backup runtime in minutes and hours.
VA to Watts Calculator — Convert volt-amps (VA) to watts using power factor. Essential for UPS sizing, transformer loading, and understanding the difference between VA and watt ratings.
Washer Cost per Load Calculator — Calculate the electricity and water cost per washing machine load. Enter energy use, water cost, and loads per week for total laundry washing expenses.
Watts to Amps Calculator — Convert watts to amps for any voltage. Enter wattage and voltage to find current draw for circuit sizing, breaker selection, and wire gauge planning.