Cost to Run a 250-watt electric knife sharpener for 24 hours in Washington
Running a 250-watt electric knife sharpener for 24 hours uses 6 kWh and costs $0.69 at $0.115/kWh in Washington. Do that every day and it adds up to $20.70 a month.
Calculate your own cost
- Per hour
- $0.0290.25 kWh
- Per day
- $0.696 kWh
- Per week
- $4.8342 kWh
- Per month (30 days)
- $20.70180 kWh
- Per year
- $251.852,190 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 250-watt electric knife sharpener cost per hour?
At $0.115/kWh, it costs $0.029 per hour. The maths: 250 W ÷ 1,000 = 0.25 kWh per hour, × $0.115 = $0.029.
How much does it cost per month?
Used 24 hours a day for 30 days, it costs about $20.70 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 24 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?
Follow the device instructions and unplug after use. 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 $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 Washington
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.25 kWh | $0.029 | $0.863 | $10.49 |
| 2 hours | 0.5 kWh | $0.058 | $1.73 | $20.99 |
| 3 hours | 0.75 kWh | $0.086 | $2.59 | $31.48 |
| 4 hours | 1 kWh | $0.115 | $3.45 | $41.98 |
| 5 hours | 1.25 kWh | $0.144 | $4.31 | $52.47 |
| 6 hours | 1.5 kWh | $0.173 | $5.18 | $62.96 |
| 7 hours | 1.75 kWh | $0.201 | $6.04 | $73.46 |
| 8 hours | 2 kWh | $0.23 | $6.90 | $83.95 |
| 9 hours | 2.25 kWh | $0.259 | $7.76 | $94.44 |
| 10 hours | 2.5 kWh | $0.288 | $8.63 | $104.94 |
| 11 hours | 2.75 kWh | $0.316 | $9.49 | $115.43 |
| 12 hours | 3 kWh | $0.345 | $10.35 | $125.93 |
| 13 hours | 3.25 kWh | $0.374 | $11.21 | $136.42 |
| 14 hours | 3.5 kWh | $0.403 | $12.08 | $146.91 |
| 15 hours | 3.75 kWh | $0.431 | $12.94 | $157.41 |
| 16 hours | 4 kWh | $0.46 | $13.80 | $167.90 |
| 17 hours | 4.25 kWh | $0.489 | $14.66 | $178.39 |
| 18 hours | 4.5 kWh | $0.518 | $15.53 | $188.89 |
| 19 hours | 4.75 kWh | $0.546 | $16.39 | $199.38 |
| 20 hours | 5 kWh | $0.575 | $17.25 | $209.88 |
| 21 hours | 5.25 kWh | $0.604 | $18.11 | $220.37 |
| 22 hours | 5.5 kWh | $0.633 | $18.98 | $230.86 |
| 23 hours | 5.75 kWh | $0.661 | $19.84 | $241.36 |
| 24 hours | 6 kWh | $0.69 | $20.70 | $251.85 |
How we worked it out
- Energy per hour: 250 W ÷ 1,000 = 0.25 kWh
- Cost per hour: 0.25 kWh × $0.115 = $0.029
- Cost per day: × 24 hours = $0.69
- Month and year: × 30 days = $20.70, × 365 days = $251.85
Washington electricity prices
Washington pays about $0.115 per kWh, which is 34% lower than the US average of $0.175. The same electric knife sharpener would cost $31.50 a month at the national average.
What it costs in different places
Same 250-watt electric knife sharpener, 24 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 |
About electric knife sharpener running costs
Electric knife sharpeners run for only a short time, so energy cost per use is tiny despite the motor’s rated wattage.
Typical sizes: 50 W, 100 W, 150 W, 250 W.
How to spend less: Follow the device instructions and unplug after use.
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.