How Much Does a 500-watt appliance Cost to Run in Washington?
A 500-watt appliance uses 0.5 kWh per hour and costs $0.058 per hour at $0.115/kWh in Washington. Over 4 hours a day that is $0.23 per day, $6.90 per month and $83.95 per year.
Calculate your own cost
- Per hour
- $0.0580.5 kWh
- Per day
- $0.232 kWh
- Per week
- $1.6114 kWh
- Per month (30 days)
- $6.9060 kWh
- Per year
- $83.95730 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 500-watt appliance cost per hour?
At $0.115/kWh, it costs $0.058 per hour. The maths: 500 W ÷ 1,000 = 0.5 kWh per hour, × $0.115 = $0.058.
How much does it cost per month?
Used 4 hours a day for 30 days, it costs about $6.90 per month and uses 60 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
2 kWh per day, 60 kWh per month and 730 kWh per year at 4 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?
Use it for fewer hours, switch to a lower-wattage model, and check whether your utility offers cheaper off-peak rates. Enter your own rate above to see the effect.
Does my electricity rate change the answer?
Yes, a lot. At 10¢ per kWh the monthly cost is $6.00 and at 30¢ it is $18.00. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in Washington
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.5 kWh | $0.058 | $1.73 | $20.99 |
| 2 hours | 1 kWh | $0.115 | $3.45 | $41.98 |
| 3 hours | 1.5 kWh | $0.173 | $5.18 | $62.96 |
| 4 hours | 2 kWh | $0.23 | $6.90 | $83.95 |
| 5 hours | 2.5 kWh | $0.288 | $8.63 | $104.94 |
| 6 hours | 3 kWh | $0.345 | $10.35 | $125.93 |
| 7 hours | 3.5 kWh | $0.403 | $12.08 | $146.91 |
| 8 hours | 4 kWh | $0.46 | $13.80 | $167.90 |
| 9 hours | 4.5 kWh | $0.518 | $15.53 | $188.89 |
| 10 hours | 5 kWh | $0.575 | $17.25 | $209.88 |
| 11 hours | 5.5 kWh | $0.633 | $18.98 | $230.86 |
| 12 hours | 6 kWh | $0.69 | $20.70 | $251.85 |
| 13 hours | 6.5 kWh | $0.748 | $22.43 | $272.84 |
| 14 hours | 7 kWh | $0.805 | $24.15 | $293.83 |
| 15 hours | 7.5 kWh | $0.863 | $25.88 | $314.81 |
| 16 hours | 8 kWh | $0.92 | $27.60 | $335.80 |
| 17 hours | 8.5 kWh | $0.978 | $29.33 | $356.79 |
| 18 hours | 9 kWh | $1.04 | $31.05 | $377.78 |
| 19 hours | 9.5 kWh | $1.09 | $32.78 | $398.76 |
| 20 hours | 10 kWh | $1.15 | $34.50 | $419.75 |
| 21 hours | 10.5 kWh | $1.21 | $36.23 | $440.74 |
| 22 hours | 11 kWh | $1.27 | $37.95 | $461.73 |
| 23 hours | 11.5 kWh | $1.32 | $39.68 | $482.71 |
| 24 hours | 12 kWh | $1.38 | $41.40 | $503.70 |
How we worked it out
- Energy per hour: 500 W ÷ 1,000 = 0.5 kWh
- Cost per hour: 0.5 kWh × $0.115 = $0.058
- Cost per day: × 4 hours = $0.23
- Month and year: × 30 days = $6.90, × 365 days = $83.95
Washington electricity prices
Washington pays about $0.115 per kWh, which is 34% lower than the US average of $0.175. The same appliance would cost $10.50 a month at the national average.
What it costs in different places
Same 500-watt appliance, 4 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $10.50 |
| California | $0.32 | $19.20 |
| Texas | $0.155 | $9.30 |
| New York | $0.25 | $15.00 |
| Florida | $0.155 | $9.30 |
| Illinois | $0.17 | $10.20 |
| Pennsylvania | $0.18 | $10.80 |
| Ohio | $0.17 | $10.20 |
| Washington | $0.115 | $6.90 |
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 Washington. 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.