Calculator collection

Electricity Cost Calculators: kWh, Appliance & Energy Bill Tools

Use these calculators when you know or can estimate watts, hours, kWh rate, duty cycle, charge level, miles, hot-water use, or system size and want a practical daily, monthly, seasonal, or yearly electricity estimate.

How to use this collection

Use this collection when you want to estimate how much a boiler, water heater, summer AC, appliance, EV charge, battery, or solar system may cost or save over time. Start with watts or kW, hours used, kWh rate, duty cycle, charge window, or hot-water use whenever possible.

Buying guidance

For buying guidance, compare purchase price with electric operating cost. A cheaper boiler, water heater, AC, pump, battery, or appliance may cost more over a season if it uses more electricity. Use daily, monthly, seasonal, and yearly kWh estimates before choosing products that run for many hours.

Common mistakes

Common mistakes include using the advertised energy rate instead of the all-in electric bill rate, assuming every appliance runs at full power all day, ignoring boiler duty cycle or EV charging losses, and missing fixed charges, taxes, seasonal use, or water-heater efficiency ratings.

Popular calculators

Start with the tools that match the decision you need to make, then use a related calculator for the next check.

Costs Electricity Cost Calculator Estimate appliance electricity cost from watts, runtime, and local rate, then compare daily, monthly, and yearly bill impact. Costs Appliance Wattage Cost Calculator Estimate appliance electricity cost from watts, daily use, duty cycle, and electricity rate. Home Air Window AC Electricity Cost Calculator Estimate how much a window air conditioner costs to run daily, monthly, and seasonally from watts, hours, and electric rate. Costs Portable AC Electricity Cost Calculator Estimate portable AC electricity cost from watts, runtime, compressor duty cycle, days used, and electricity rate.

How to narrow the choice

For electricity decisions, start with wattage, run time, kWh rate, and whether the device cycles on and off. Use equivalent kW plus the specific boiler, water-heater, or EV tool when duty cycle, UEF, battery percentage, charger power, or charging losses matter.

Decision guide

Which calculator should I use?

Start with the calculator that matches the decision you can act on today, then use related tools to refine the estimate.

Swipe to see all columns.

Electricity Cost Calculators: kWh, Appliance & Energy Bill Tools decision guide
User goal	Best calculator	Why it helps
Any device with watts and run time	Electricity Cost Calculator	Best first stop when you know wattage, hours per day, and your kWh rate.
Heating water or running an electric boiler	Electric Water Heater Cost Calculator	Compares standard and heat-pump UEF costs, while the boiler tool handles duty cycle and heating-season cost.
Planning an EV charge window	EV Charging Time Calculator	Turns battery percentage, usable capacity, charger power, and losses into hours and range added.
Cooling with a window unit	Window AC Electricity Cost Calculator	Connects AC wattage, run time, and seasonal use to a bill estimate.
Running fans overnight	Ceiling Fan Electricity Cost Calculator	Shows the overnight and monthly cost of lower-watt cooling comfort.
Running a pool pump	Pool Pump Electricity Cost Calculator	Compares pump watts, hours per day, days per month, and rate.

Collection calculators

Calculator categories

Use these groups to jump from the broad topic to the calculator that matches your next decision.

General electricity and appliance tools

Costs Refrigerator Electricity Cost Calculator Estimate refrigerator electricity cost from average wattage, duty cycle, and electricity rate. Costs Gaming PC Electricity Cost Calculator Estimate gaming PC electricity cost from average watts, hours played, days used, and electricity rate. Costs Home Office Electricity Cost Calculator Estimate home office electricity cost from computer, monitor, lighting, peripherals, hours, workdays, and kWh rate. Costs Dishwasher Electricity and Water Cost Calculator Estimate dishwasher electricity and water cost from cycles per week, kWh per cycle, gallons per cycle, utility rates, and drying use. Costs Oven vs Air Fryer Electricity Cost Calculator Compare oven and air fryer electricity cost using wattage, cook time, preheat time, uses per week, and electricity rate. Costs Christmas Lights Electricity Cost Calculator Estimate holiday light electricity cost from watts per strand, strand count, hours per night, display days, and electricity rate. Costs LED vs Incandescent Bulb Cost Calculator Compare electricity cost for LED and incandescent bulbs from watts, hours used, bulb count, and electricity rate. Costs Laundry Cost Calculator Estimate laundry electricity cost from loads per week, washer energy, dryer energy, and electricity rate. Costs Electric Bill Estimator by State Estimate electric bill from monthly kWh, state or local electricity rate, fixed charges, taxes, and seasonal usage factor.

Heating and cooling cost tools

Costs Electric Boiler Running Cost Calculator Estimate an electric boiler's daily, monthly, and heating-season running cost from power, runtime, duty cycle, local electricity rate, and heating days. Costs Electric Water Heater Cost Calculator Estimate monthly electric water-heating cost, then compare annual energy use, savings, and simple payback for a standard or heat-pump water heater. Costs Space Heater Electricity Cost Calculator Estimate space heater operating cost from wattage, hours used, electric rate, and number of days. Costs Space Heater vs Central Heat Cost Calculator Compare the cost of using a plug-in space heater with the estimated cost of heating a room using central heat. Costs Ceiling Fan Electricity Cost Calculator Estimate ceiling fan electricity cost from fan wattage, daily runtime, number of fans, days used, and electricity rate. Home Air Dehumidifier Electricity Cost Calculator Estimate how much a dehumidifier costs to run per day, month, and season from wattage, run time, duty cycle, and electricity rate. Costs Heat Lamp Electricity Cost Calculator Estimate heat lamp cost per day or month from watts, lamp count, daily runtime, days used, and electricity rate with safety reminders. Home Air Heat Pump vs Furnace Cost Calculator Compare estimated yearly heating cost for a heat pump and furnace using seasonal electricity use, fuel use, and local energy rates. Home Air Air Purifier Annual Ownership Cost Calculator Estimate yearly air purifier ownership cost from filter replacement price, replacement frequency, wattage, runtime, and electricity rate. Costs Hot Tub Electricity Cost Calculator Estimate hot tub electricity cost from heater watts, pump watts, daily runtime, standby use, and electricity rate. Costs Pool Pump Electricity Cost Calculator Estimate pool pump operating cost from pump watts, daily runtime, days used, and electricity rate.

EV, solar, battery, and generator tools

More calculators in this hub

Costs Portable Power Station Solar Charge Time Calculator Estimate portable power station solar charging time from battery capacity, charge window, panel watts, solar input limit, conversion losses, concurrent loads, and peak sun hours. Costs Well Pump Electricity Cost Calculator Estimate well-pump electricity by cycle, active month, season, and 1,000 gallons from pump watts, cycle time, daily cycling, water moved, and local rate.

Guides and examples

Related guides

These support pages answer long-tail questions, explain assumptions, and give examples around the calculators in this cluster.

Costs How to Estimate Electricity Cost for an Appliance Use watts, hours, and your kWh rate to estimate daily, monthly, and yearly appliance electricity costs. Home Air 30-Pint vs. 50-Pint Dehumidifier Compare 30-pint and 50-pint dehumidifiers for bedrooms, basements, laundry rooms, and damp spaces. Costs How Much Does It Cost to Run a Dehumidifier? Estimate dehumidifier electricity cost from watts, runtime, duty cycle, humidity, and electricity rate. Costs How Much Does It Cost to Run a Space Heater? Estimate space heater electricity cost from wattage, hours used, days used, and kWh rate, with notes on runtime, safety, and heating one room. Costs How Many Watts Does a Gaming PC Use? Estimate gaming PC wattage and electricity cost for GPUs, CPUs, monitors, and gaming sessions. Finance Remote, Hybrid, and Office Work Costs: Compare the Cash Difference Compare office, hybrid, and remote annual cash costs using commute days, meals, childcare, home-office expenses, and other arrangement-specific inputs. Finance Gas vs. EV Driving Cost Guide Compare gasoline and EV driving energy cost per mile and per year using the same annual miles, actual fuel price, and an all-in electricity rate. Finance Vehicle Cost Per Mile Guide Estimate personal vehicle ownership cost per mile by keeping fixed and variable annual costs visible and separate from the IRS mileage rate. Home Air Basement Dehumidifier Drainage Checklist Check basement dehumidifier drainage options, pump needs, hose routing, low-temperature operation, and maintenance before buying. Home Air Air Purifier Filter Cost Comparison Guide Compare air purifier filter cost, replacement interval, prefilters, room size, and annual ownership cost. Home Air What Size Dehumidifier for 500 Sq Ft Basement? Estimate the right dehumidifier size for a 500 square foot basement and check when to round up for damp conditions. Home Air What Size Dehumidifier for 1000 Sq Ft Basement? Estimate dehumidifier pint size for a 1,000 square foot basement with damp, musty, or humid conditions.

Related categories

Use these neighboring hubs when your estimate crosses into cost, equipment, project, moving, finance, or classroom planning.

Home Air Calculators Home Improvement Materials Finance Calculators

Charts

Electricity Costs charts

Printable charts and Pinterest-ready images for common quick-reference searches.

Costs chart Space Heater Electricity Cost Chart Use this space heater electricity cost chart to compare heater wattage, daily runtime, kWh use, and monthly cost at an example electric rate. Costs chart Electricity Cost per Appliance Chart Use this electricity cost per appliance chart to compare common wattages, run times, and monthly cost ranges. Costs chart Generator Wattage Chart Use this generator wattage chart to compare common household loads before sizing backup power. Costs chart EV Charging Cost Chart Use this EV charging cost chart to compare battery size, electricity rate, and estimated charge cost.

FAQs

Electricity Costs cluster questions

What electricity cost calculator should I use first?

Use the general electricity cost calculator for any device with watts and hours. Use the appliance-specific calculators when you want a more tailored setup.

Why do electricity estimates vary from my bill?

Real bills include changing rates, taxes, fees, duty cycles, seasonal usage, and devices that cycle on and off. Use your all-in kWh rate for a better estimate.