Hours per day dominates
Monthly cost scales almost linearly with daily hours. Cutting a 12-hour habit to 6 hours halves the bill; the wattage is usually fixed at 1,500 W by the unit itself.
Space Heater Cost per Month
Updated July 2026 rate dataHeating & CoolingSourced from U.S. EIA
Hours per day do most of the work here, because a heater holding a set temperature doesn't draw full power around the clock — a sealed room typically runs its element well under continuously. Enter your daily hours, wattage, and state below and the monthly figure updates.
Quick pick
EIA residential average, July 2026. Your utility's exact rate is on your bill.
1,500 W
200 W3,000 W
6 h
0.5 h24 h
Common setups
Live cost meter · running at your current settings
$0.00000
since you opened this page · 0:00 elapsed
1.50 kW · 0.0000 kWh burned
burn rate
$0.27/hr
24/7 ≈ $201/mo
Real-time math: 1,500 W × your state's rate, accumulating live. Thermostatically controlled units cycle on and off, so average use is usually below the flat-out figure.
Per hour
$0.27
Per day
$1.65
9 kWh
Per month
$50.12
274 kWh
Per year
$601
3,285 kWh
Run like this for a year and it adds about $601 to your electricity bill.
Energy: 9 kWh per day · 3,285 kWh per year, at 18.31¢/kWh (U.S. average).
How many watts does a space heater use, and what does it cost to run?
Wattage is the number that decides everything else. The table below runs the actual figures through this page's calculator at the U.S. average rate of 18.31¢ /kWh, so you can see the running cost jump as the load climbs. Change any value above and the whole page recalculates.
| Watts | Power draw | Per hour | Per month (6 h/day) |
|---|---|---|---|
| 200 W | 200 W draws 0.20 kW | $0.037 | $6.68 |
| 1,135 W | 1,135 W draws 1.14 kW | $0.21 | $37.93 |
| 2,065 W | 2,065 W draws 2.06 kW | $0.38 | $69.01 |
| 3,000 W | 3,000 W draws 3.00 kW | $0.55 | $100 |
Basis: July 2026 U.S. average residential rate of 18.31¢ /kWh (EIA Electric Power Monthly, Table 5.6.A). Your state's rate is applied as soon as you pick it above.
What changes the number
Where the rate comes from
We use the EIA's published residential average price by state (Electric Power Monthly, Table 5.6.A). Your utility's exact 'price to compare' on your bill may sit slightly above or below the state average depending on your provider.
Thermostat and eco modes
A heater holding a set temperature doesn't draw full power all day. Expect a real-world duty cycle of 40–70% in a reasonably sealed room, which is why a theoretical $50/month often lands closer to $25–35 on the bill.
Cut the cost
Biggest savings first.
- Set the heater's thermostat a degree lower and layer up — each degree less heat is proportionally less element-on time.
- Run the heater where you are, and keep interior doors closed so you're not paying to warm hallway air.
- If your utility offers time-of-use pricing, shifting heater hours out of peak windows can cut the same kWh cost by 10–30%.
- Clean filters on fan-forced heaters keep airflow efficient — a struggling fan doesn't change element cost but shortens the heater's life.
Frequently asked questions
How much does a 1500W heater cost per month if I run it all day?
12 hours a day at the U.S. average rate (18.31¢/kWh) is about $100/month; 24 hours a day is roughly $200/month. Those are flat-out figures — thermostat cycling usually trims 30–60% off in practice.
How many kWh does a space heater use per month?
A 1,500 W heater uses 1.5 kWh per hour of element-on time. At 6 hours a day that is 274 kWh per month (about $50 at the U.S. average rate). At 2 hours a day it is 91 kWh.
Is a space heater cheaper than turning up the thermostat?
It can be — if you heat only the room you're in and let the rest of the house sit a few degrees cooler. That is zone heating. If the space heater runs on top of normal central heating, it simply adds to the bill.
Sources
- U.S. EIA, Electric Power Monthly Table 5.6.A — Average Price of Electricity by State
- U.S. EIA — Electricity use in homes (end-use shares)
Rate basis: EIA residential average, July 2026 (retrieved from Electric Power Monthly Table 5.6.A). Estimates are for planning, not billing.
