How this space heater electricity cost calculator works
Space-heater cost uses heater watts ÷ 1,000 × operating hours per day, then multiplies the resulting kWh by the utility rate and the selected time period.
How to use it
- Power draw. Enter the value in W.
- Hours used per day. Enter the value in hours.
- Days used per month. Enter the value in days.
- Electricity rate. Enter the value in $/kWh.
- Request the result. Add your email, then select “Email & show my result.”
What to do with the number
Most portable resistance heaters draw close to their labeled high-setting wattage while actively heating, but thermostat cycling can reduce average consumption. If the heater cycles on a thermostat, estimate the fraction of each hour it actually heats and reduce the daily run-hours input accordingly.
Planning estimate
Use this result as a starting point, not a guarantee. Product specifications, site conditions, manufacturer guidance, local codes, taxes, labor, tolerances, and rounding can change the real requirement or cost.