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. Use the chart as a quick planning reference, then use Space Heater Electricity Cost Calculator when you need exact numbers for your own inputs.
Chart values
| Heater use | Daily kWh | 30-day cost at $0.16/kWh |
|---|---|---|
| 750 W for 4 hr/day | 3 kWh | $14.40 |
| 1,500 W for 4 hr/day | 6 kWh | $28.80 |
| 1,500 W for 8 hr/day | 12 kWh | $57.60 |
| 1,500 W for 12 hr/day | 18 kWh | $86.40 |
Calculated from the existing space heater electricity cost calculator formulaSpec: watts / 1000 * hoursPerDay * days * rate.
How to use this chart
Find the wattage and daily runtime closest to your heater use. Use the calculator if your electric rate, number of days, duty cycle, or heater setting differs.
When to use the calculator instead
Use the calculator when your measurements, rates, room conditions, local prices, tank setup, loan terms, or classroom routine do not match the simple chart rows. The calculator lets you adjust the inputs instead of forcing your situation into a rough example.
Examples from this chart
Worked example
A 1,500 W heater running 8 hours per day uses 12 kWh/day. At $0.16/kWh for 30 days, that is about $57.60.
Limitations and assumptions
Rows use the space heater cost calculator formula: watts divided by 1,000, multiplied by hours per day, 30 days, and a $0.16/kWh example rate. The chart assumes the heater draws the listed wattage while running.
Save or share this chart
You can print this page, save the tall image for planning, or link to the page from a blog post, classroom resource, forum answer, or project checklist so readers can open the calculator too.
Chart questions
Chart questions
Why might my space heater cost be lower than the chart?
Thermostats and lower settings can cycle the heater off, which reduces real kWh use.
Can a space heater replace central heat?
Use the chart for cost planning only. Follow heater safety instructions and avoid using portable heaters as unattended primary heat.