Watt setting
High is often 1,500 watts, while low or eco modes may draw less or cycle off.
Heating cost
Calculate space heater electricity cost before it surprises the winter bill.
Most portable heaters draw about 1,500 watts on high. Use watts, hours per day, your electric rate, and billing days to see whether the heater is a small comfort cost or the reason the bill feels high.
Quick estimates
Short use
1,500 W x 2 h/day$15-$31/mo
Useful for occasional room heating or a short evening schedule.
Daily use
1,500 W x 5 h/day$38-$77/mo
Common winter pattern that can noticeably raise the electric bill.
Heavy use
1,500 W x 10 h/day$77-$154/mo
Worth auditing closely, especially if more than one heater runs.
Hours per day
Runtime is the main difference between a small comfort cost and a high bill.
Room heat loss
Drafts, poor insulation, and open doors make the heater run longer.
Safety and placement
Use heaters only as intended and avoid unsafe setups while trying to save money.
Cost formula
A 1,500 watt heater uses 1.5 kWh each hour.
Multiply 1.5 kWh by hours per day, billing days, and your electricity rate. Five hours per day for 30 days is 225 kWh.
For a quick monthly estimate, multiply heater watts by daily hours and billing days, divide by 1,000, then multiply by the electric rate. Delivery charges and fixed customer fees can make the bill total higher than the heater-only cost.
If your bill rose in winter, compare heater hours, electric heat, heat pump backup heat, and billing days before assuming the rate changed.
Space heater electricity tools
Electricity cost calculator
Add heater kWh into the full electric bill with delivery, fixed fees, taxes, and billing days.
Open pageWattage cost calculators
Browse common wattage levels before estimating a heater schedule.
Open pageAppliance energy calculator
Compare space heating with AC, dryers, water heaters, and other large loads.
Open pageWhy is my electric bill so high in winter?
Check electric heat, backup heat, space heaters, water heating, and billing days.
Open pageWhy is my electric bill so high?
Use the main diagnosis page if the heater is only one possible cause.
Open pageWinter utility bill calculator
Compare heater cost with water, sewer, fixed fees, and billing days.
Open pageElectric bill audit checklist
Review billing days, kWh, rate, fixed fees, and major loads.
Open pageNormal kWh usage
Check whether heater use pushed the month into a high usage band.
Open pageLower electric bill guide
Find the fastest changes after estimating heater cost.
Open pageFAQ
Short answers for search visitors and bill-checking moments.
What is the easiest way to calculate space heater electricity cost?
Multiply heater watts by hours, divide by 1,000 to get kWh, then multiply by your electric rate. A 1,500 watt heater uses 1.5 kWh each hour it runs.
How much does a 1500 watt space heater cost to run?
A 1,500 watt heater uses 1.5 kWh per hour. At 17 cents per kWh, one hour costs about 26 cents and 5 hours per day is about $39 per 30-day month.
How much does a space heater cost to run per month?
Monthly cost depends on wattage, hours per day, billing days, and electric rate. A 1,500 watt heater running 5 hours per day for 30 days uses 225 kWh before delivery charges or fixed fees are considered.
Can a space heater make my electric bill high?
Yes. Resistance heat is power-heavy, and several hours per day can add more to the bill than many small appliances combined.
Is a space heater cheaper than central heat?
It can be cheaper for one occupied room, but expensive if it runs many hours or replaces a more efficient heat pump or gas furnace.