How Much Does a 50-watt electric knife sharpener Cost to Run in Washington?
A 50-watt electric knife sharpener uses 0.05 kWh per hour and costs $0.006 per hour at $0.115/kWh in Washington. Used 0.05 hours a day, that is $0.0003 per day, $0.009 per month and $0.105 per year.
Calculate your own cost
- Per hour
- $0.0060.05 kWh
- Per day
- $0.00030 kWh
- Per week
- $0.0020.02 kWh
- Per month (30 days)
- $0.0090.08 kWh
- Per year
- $0.1050.91 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 50-watt electric knife sharpener cost per hour?
At $0.115/kWh, it costs $0.006 per hour. The maths: 50 W ÷ 1,000 = 0.05 kWh per hour, × $0.115 = $0.006.
How much does it cost per month?
Used 0.05 hours a day for 30 days, it costs about $0.009 per month and uses 0.08 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
0 kWh per day, 0.08 kWh per month and 0.91 kWh per year at 0.05 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 $0.008 and at 30¢ it is $0.023. 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 | 0.05 kWh | $0.006 | $0.173 | $2.10 |
| 2 hours | 0.1 kWh | $0.012 | $0.345 | $4.20 |
| 3 hours | 0.15 kWh | $0.017 | $0.518 | $6.30 |
| 4 hours | 0.2 kWh | $0.023 | $0.69 | $8.40 |
| 5 hours | 0.25 kWh | $0.029 | $0.863 | $10.49 |
| 6 hours | 0.3 kWh | $0.035 | $1.04 | $12.59 |
| 7 hours | 0.35 kWh | $0.04 | $1.21 | $14.69 |
| 8 hours | 0.4 kWh | $0.046 | $1.38 | $16.79 |
| 9 hours | 0.45 kWh | $0.052 | $1.55 | $18.89 |
| 10 hours | 0.5 kWh | $0.058 | $1.73 | $20.99 |
| 11 hours | 0.55 kWh | $0.063 | $1.90 | $23.09 |
| 12 hours | 0.6 kWh | $0.069 | $2.07 | $25.19 |
| 13 hours | 0.65 kWh | $0.075 | $2.24 | $27.28 |
| 14 hours | 0.7 kWh | $0.081 | $2.42 | $29.38 |
| 15 hours | 0.75 kWh | $0.086 | $2.59 | $31.48 |
| 16 hours | 0.8 kWh | $0.092 | $2.76 | $33.58 |
| 17 hours | 0.85 kWh | $0.098 | $2.93 | $35.68 |
| 18 hours | 0.9 kWh | $0.104 | $3.11 | $37.78 |
| 19 hours | 0.95 kWh | $0.109 | $3.28 | $39.88 |
| 20 hours | 1 kWh | $0.115 | $3.45 | $41.98 |
| 21 hours | 1.05 kWh | $0.121 | $3.62 | $44.07 |
| 22 hours | 1.1 kWh | $0.127 | $3.80 | $46.17 |
| 23 hours | 1.15 kWh | $0.132 | $3.97 | $48.27 |
| 24 hours | 1.2 kWh | $0.138 | $4.14 | $50.37 |
How we worked it out
- Energy per hour: 50 W ÷ 1,000 = 0.05 kWh
- Cost per hour: 0.05 kWh × $0.115 = $0.006
- Cost per day: × 0.05 hours = $0.0003
- Month and year: × 30 days = $0.009, × 365 days = $0.105
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 $0.013 a month at the national average.
What it costs in different places
Same 50-watt electric knife sharpener, 0.05 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $0.013 |
| California | $0.32 | $0.024 |
| Texas | $0.155 | $0.012 |
| New York | $0.25 | $0.019 |
| Florida | $0.155 | $0.012 |
| Illinois | $0.17 | $0.013 |
| Pennsylvania | $0.18 | $0.014 |
| Ohio | $0.17 | $0.013 |
| Washington | $0.115 | $0.009 |
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.