Cost to Run a 500-watt baseboard heater for 18 hours in California
Running a 500-watt baseboard heater for 18 hours uses 9 kWh and costs $2.88 at $0.32/kWh in California. Do that every day and it adds up to $86.40 a month.
Calculate your own cost
- Per hour
- $0.160.5 kWh
- Per day
- $2.889 kWh
- Per week
- $20.1663 kWh
- Per month (30 days)
- $86.40270 kWh
- Per year
- $1,051.203,285 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 500-watt baseboard heater cost per hour?
At $0.32/kWh, it costs $0.16 per hour. The maths: 500 W ÷ 1,000 = 0.5 kWh per hour, × $0.32 = $0.16.
How much does it cost per month?
Used 18 hours a day for 30 days, it costs about $86.40 per month and uses 270 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
9 kWh per day, 270 kWh per month and 3,285 kWh per year at 18 hours a day. A kWh is one kilowatt (1,000 W) used for one hour. It is the unit on your electricity bill.
How can I lower the cost?
Lower the thermostat by 1 to 2 degrees and close doors to rooms you are not using. Check your bill for the exact rate and enter it above.
Does my electricity rate change the answer?
Yes, a lot. At 10¢ per kWh the monthly cost is $27.00 and at 30¢ it is $81.00. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in California
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.5 kWh | $0.16 | $4.80 | $58.40 |
| 2 hours | 1 kWh | $0.32 | $9.60 | $116.80 |
| 3 hours | 1.5 kWh | $0.48 | $14.40 | $175.20 |
| 4 hours | 2 kWh | $0.64 | $19.20 | $233.60 |
| 5 hours | 2.5 kWh | $0.80 | $24.00 | $292.00 |
| 6 hours | 3 kWh | $0.96 | $28.80 | $350.40 |
| 7 hours | 3.5 kWh | $1.12 | $33.60 | $408.80 |
| 8 hours | 4 kWh | $1.28 | $38.40 | $467.20 |
| 9 hours | 4.5 kWh | $1.44 | $43.20 | $525.60 |
| 10 hours | 5 kWh | $1.60 | $48.00 | $584.00 |
| 11 hours | 5.5 kWh | $1.76 | $52.80 | $642.40 |
| 12 hours | 6 kWh | $1.92 | $57.60 | $700.80 |
| 13 hours | 6.5 kWh | $2.08 | $62.40 | $759.20 |
| 14 hours | 7 kWh | $2.24 | $67.20 | $817.60 |
| 15 hours | 7.5 kWh | $2.40 | $72.00 | $876.00 |
| 16 hours | 8 kWh | $2.56 | $76.80 | $934.40 |
| 17 hours | 8.5 kWh | $2.72 | $81.60 | $992.80 |
| 18 hours | 9 kWh | $2.88 | $86.40 | $1,051.20 |
| 19 hours | 9.5 kWh | $3.04 | $91.20 | $1,109.60 |
| 20 hours | 10 kWh | $3.20 | $96.00 | $1,168.00 |
| 21 hours | 10.5 kWh | $3.36 | $100.80 | $1,226.40 |
| 22 hours | 11 kWh | $3.52 | $105.60 | $1,284.80 |
| 23 hours | 11.5 kWh | $3.68 | $110.40 | $1,343.20 |
| 24 hours | 12 kWh | $3.84 | $115.20 | $1,401.60 |
How we worked it out
- Energy per hour: 500 W ÷ 1,000 = 0.5 kWh
- Cost per hour: 0.5 kWh × $0.32 = $0.16
- Cost per day: × 18 hours = $2.88
- Month and year: × 30 days = $86.40, × 365 days = $1,051.20
California electricity prices
California pays about $0.32 per kWh, which is 83% higher than the US average of $0.175. The same baseboard heater would cost $47.25 a month at the national average.
What it costs in different places
Same 500-watt baseboard heater, 18 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $47.25 |
| California | $0.32 | $86.40 |
| Texas | $0.155 | $41.85 |
| New York | $0.25 | $67.50 |
| Florida | $0.155 | $41.85 |
| Illinois | $0.17 | $45.90 |
| Pennsylvania | $0.18 | $48.60 |
| Ohio | $0.17 | $45.90 |
| Washington | $0.115 | $31.05 |
About baseboard heater running costs
Electric baseboard heaters give roughly 250 W per foot of length. They are quiet but expensive to run all day.
Typical sizes: 500 W, 750 W, 1,000 W, 1,500 W, 2,000 W.
How to spend less: Lower the thermostat by 1 to 2 degrees and close doors to rooms you are not using.
What this estimate assumes
- The appliance draws its full stated wattage the whole time it is on. Real units with a thermostat cycle off and cost less.
- Wattage is the typical label value, not a measured value. Check the label on your own appliance.
- The rate is an approximate residential average in California. Your bill may include fixed fees, tiers or time-of-use pricing. Edit the rate above.
- A month is 30 days and a year is 365 days.