Heating
Space Heater
Estimate how much a portable electric space heater adds to a monthly bill and compare lower heat settings.
- Default use
- 180 kWh/mo
- Estimated cost
- $29.59/mo
Home energy math without guesswork
Electricity cost calculators for real home bills.
Estimate what common appliances add to your bill, adjust every assumption, and learn where savings are actually worth chasing.
Editable Use your appliance label and utility rate.
Transparent Every estimate shows the formula.
Data-ready Built for official rate refreshes.
Electricity cost calculator
Space heater running cost
Daily use 0 kWh
Monthly use 0 kWh
Daily cost $0.00
Yearly cost $0.00
Formula: watts / 1000 x hours used x electricity rate. Real bills can differ because appliances cycle on and off, utility plans vary, and taxes or delivery charges may apply.
Starting assets
Appliance cost calculators
Each calculator starts with conservative assumptions, then lets readers replace defaults with measured wattage and their own electricity price.
Cooling
Window Air Conditioner
Calculate the running cost of a window AC unit by wattage, daily runtime, and electricity rate.
- Default use
- 216 kWh/mo
- Estimated cost
- $35.51/mo
Kitchen
Refrigerator
Estimate refrigerator electricity cost with duty-cycle assumptions instead of assuming the compressor runs all day.
- Default use
- 36 kWh/mo
- Estimated cost
- $5.92/mo
Laundry
Electric Clothes Dryer
Estimate electric dryer cost per load, per month, and per year using runtime and local electricity rate.
- Default use
- 60 kWh/mo
- Estimated cost
- $9.86/mo
Air quality
Dehumidifier
Calculate dehumidifier operating cost for basements, laundry rooms, and humid climates.
- Default use
- 150 kWh/mo
- Estimated cost
- $24.66/mo
Transportation
Home EV Charger
Estimate home EV charging cost from charger power, charging hours, and electricity price.
- Default use
- 432 kWh/mo
- Estimated cost
- $71.02/mo
Why this site exists
Most energy advice is either too vague or too exact.
WattWise Home sits in the middle. It gives readers a fast estimate, shows the equation, and points out when a meter, label, or utility plan matters more than a generic average.
The long-term content system is built around useful assets: calculators, comparison tables, measured examples, and official data updates. That keeps the site aligned with search quality expectations while creating pages that can earn over time.