Cost to Run a 300-watt appliance for 20 hours in Texas
Running a 300-watt appliance for 20 hours uses 6 kWh and costs $0.93 at $0.155/kWh in Texas. Do that every day and it adds up to $27.90 a month.
Calculate your own cost
- Per hour
- $0.0470.3 kWh
- Per day
- $0.936 kWh
- Per week
- $6.5142 kWh
- Per month (30 days)
- $27.90180 kWh
- Per year
- $339.452,190 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 $0.155/kWh, it costs $0.047 per hour. The maths: 300 W ÷ 1,000 = 0.3 kWh per hour, × $0.155 = $0.047.
How much does it cost per month?
Used 20 hours a day for 30 days, it costs about $27.90 per month and uses 180 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
6 kWh per day, 180 kWh per month and 2,190 kWh per year at 20 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 $18.00 and at 30¢ it is $54.00. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in Texas
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.3 kWh | $0.047 | $1.40 | $16.97 |
| 2 hours | 0.6 kWh | $0.093 | $2.79 | $33.95 |
| 3 hours | 0.9 kWh | $0.14 | $4.19 | $50.92 |
| 4 hours | 1.2 kWh | $0.186 | $5.58 | $67.89 |
| 5 hours | 1.5 kWh | $0.233 | $6.98 | $84.86 |
| 6 hours | 1.8 kWh | $0.279 | $8.37 | $101.84 |
| 7 hours | 2.1 kWh | $0.326 | $9.77 | $118.81 |
| 8 hours | 2.4 kWh | $0.372 | $11.16 | $135.78 |
| 9 hours | 2.7 kWh | $0.419 | $12.56 | $152.75 |
| 10 hours | 3 kWh | $0.465 | $13.95 | $169.73 |
| 11 hours | 3.3 kWh | $0.512 | $15.35 | $186.70 |
| 12 hours | 3.6 kWh | $0.558 | $16.74 | $203.67 |
| 13 hours | 3.9 kWh | $0.605 | $18.14 | $220.64 |
| 14 hours | 4.2 kWh | $0.651 | $19.53 | $237.62 |
| 15 hours | 4.5 kWh | $0.698 | $20.93 | $254.59 |
| 16 hours | 4.8 kWh | $0.744 | $22.32 | $271.56 |
| 17 hours | 5.1 kWh | $0.791 | $23.72 | $288.53 |
| 18 hours | 5.4 kWh | $0.837 | $25.11 | $305.51 |
| 19 hours | 5.7 kWh | $0.884 | $26.51 | $322.48 |
| 20 hours | 6 kWh | $0.93 | $27.90 | $339.45 |
| 21 hours | 6.3 kWh | $0.977 | $29.30 | $356.42 |
| 22 hours | 6.6 kWh | $1.02 | $30.69 | $373.40 |
| 23 hours | 6.9 kWh | $1.07 | $32.09 | $390.37 |
| 24 hours | 7.2 kWh | $1.12 | $33.48 | $407.34 |
How we worked it out
- Energy per hour: 300 W ÷ 1,000 = 0.3 kWh
- Cost per hour: 0.3 kWh × $0.155 = $0.047
- Cost per day: × 20 hours = $0.93
- Month and year: × 30 days = $27.90, × 365 days = $339.45
Texas electricity prices
Texas pays about $0.155 per kWh, which is 11% lower than the US average of $0.175. The same appliance would cost $31.50 a month at the national average.
What it costs in different places
Same 300-watt appliance, 20 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $31.50 |
| California | $0.32 | $57.60 |
| Texas | $0.155 | $27.90 |
| New York | $0.25 | $45.00 |
| Florida | $0.155 | $27.90 |
| Illinois | $0.17 | $30.60 |
| Pennsylvania | $0.18 | $32.40 |
| Ohio | $0.17 | $30.60 |
| Washington | $0.115 | $20.70 |
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 Texas. 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.