Cost to Run a 300-watt appliance for 10 hours in Illinois
Running a 300-watt appliance for 10 hours uses 3 kWh and costs $0.51 at $0.17/kWh in Illinois. Do that every day and it adds up to $15.30 a month.
Calculate your own cost
- Per hour
- $0.0510.3 kWh
- Per day
- $0.513 kWh
- Per week
- $3.5721 kWh
- Per month (30 days)
- $15.3090 kWh
- Per year
- $186.151,095 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 300-watt appliance cost per hour?
At $0.17/kWh, it costs $0.051 per hour. The maths: 300 W ÷ 1,000 = 0.3 kWh per hour, × $0.17 = $0.051.
How much does it cost per month?
Used 10 hours a day for 30 days, it costs about $15.30 per month and uses 90 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
3 kWh per day, 90 kWh per month and 1,095 kWh per year at 10 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 $9.00 and at 30¢ it is $27.00. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in Illinois
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.3 kWh | $0.051 | $1.53 | $18.62 |
| 2 hours | 0.6 kWh | $0.102 | $3.06 | $37.23 |
| 3 hours | 0.9 kWh | $0.153 | $4.59 | $55.85 |
| 4 hours | 1.2 kWh | $0.204 | $6.12 | $74.46 |
| 5 hours | 1.5 kWh | $0.255 | $7.65 | $93.08 |
| 6 hours | 1.8 kWh | $0.306 | $9.18 | $111.69 |
| 7 hours | 2.1 kWh | $0.357 | $10.71 | $130.31 |
| 8 hours | 2.4 kWh | $0.408 | $12.24 | $148.92 |
| 9 hours | 2.7 kWh | $0.459 | $13.77 | $167.54 |
| 10 hours | 3 kWh | $0.51 | $15.30 | $186.15 |
| 11 hours | 3.3 kWh | $0.561 | $16.83 | $204.77 |
| 12 hours | 3.6 kWh | $0.612 | $18.36 | $223.38 |
| 13 hours | 3.9 kWh | $0.663 | $19.89 | $242.00 |
| 14 hours | 4.2 kWh | $0.714 | $21.42 | $260.61 |
| 15 hours | 4.5 kWh | $0.765 | $22.95 | $279.23 |
| 16 hours | 4.8 kWh | $0.816 | $24.48 | $297.84 |
| 17 hours | 5.1 kWh | $0.867 | $26.01 | $316.46 |
| 18 hours | 5.4 kWh | $0.918 | $27.54 | $335.07 |
| 19 hours | 5.7 kWh | $0.969 | $29.07 | $353.69 |
| 20 hours | 6 kWh | $1.02 | $30.60 | $372.30 |
| 21 hours | 6.3 kWh | $1.07 | $32.13 | $390.92 |
| 22 hours | 6.6 kWh | $1.12 | $33.66 | $409.53 |
| 23 hours | 6.9 kWh | $1.17 | $35.19 | $428.15 |
| 24 hours | 7.2 kWh | $1.22 | $36.72 | $446.76 |
How we worked it out
- Energy per hour: 300 W ÷ 1,000 = 0.3 kWh
- Cost per hour: 0.3 kWh × $0.17 = $0.051
- Cost per day: × 10 hours = $0.51
- Month and year: × 30 days = $15.30, × 365 days = $186.15
Illinois electricity prices
Illinois pays about $0.17 per kWh, which is 3% lower than the US average of $0.175. The same appliance would cost $15.75 a month at the national average.
What it costs in different places
Same 300-watt appliance, 10 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $15.75 |
| California | $0.32 | $28.80 |
| Texas | $0.155 | $13.95 |
| New York | $0.25 | $22.50 |
| Florida | $0.155 | $13.95 |
| Illinois | $0.17 | $15.30 |
| Pennsylvania | $0.18 | $16.20 |
| Ohio | $0.17 | $15.30 |
| Washington | $0.115 | $10.35 |
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 Illinois. 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.