Cost to Run a 50-watt electric knife sharpener for 20 hours in Pennsylvania
Running a 50-watt electric knife sharpener for 20 hours uses 1 kWh and costs $0.18 at $0.18/kWh in Pennsylvania. Do that every day and it adds up to $5.40 a month.
Calculate your own cost
- Per hour
- $0.0090.05 kWh
- Per day
- $0.181 kWh
- Per week
- $1.267 kWh
- Per month (30 days)
- $5.4030 kWh
- Per year
- $65.70365 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 $0.18/kWh, it costs $0.009 per hour. The maths: 50 W ÷ 1,000 = 0.05 kWh per hour, × $0.18 = $0.009.
How much does it cost per month?
Used 20 hours a day for 30 days, it costs about $5.40 per month and uses 30 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
1 kWh per day, 30 kWh per month and 365 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?
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 $3.00 and at 30¢ it is $9.00. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in Pennsylvania
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.05 kWh | $0.009 | $0.27 | $3.29 |
| 2 hours | 0.1 kWh | $0.018 | $0.54 | $6.57 |
| 3 hours | 0.15 kWh | $0.027 | $0.81 | $9.86 |
| 4 hours | 0.2 kWh | $0.036 | $1.08 | $13.14 |
| 5 hours | 0.25 kWh | $0.045 | $1.35 | $16.43 |
| 6 hours | 0.3 kWh | $0.054 | $1.62 | $19.71 |
| 7 hours | 0.35 kWh | $0.063 | $1.89 | $23.00 |
| 8 hours | 0.4 kWh | $0.072 | $2.16 | $26.28 |
| 9 hours | 0.45 kWh | $0.081 | $2.43 | $29.57 |
| 10 hours | 0.5 kWh | $0.09 | $2.70 | $32.85 |
| 11 hours | 0.55 kWh | $0.099 | $2.97 | $36.14 |
| 12 hours | 0.6 kWh | $0.108 | $3.24 | $39.42 |
| 13 hours | 0.65 kWh | $0.117 | $3.51 | $42.71 |
| 14 hours | 0.7 kWh | $0.126 | $3.78 | $45.99 |
| 15 hours | 0.75 kWh | $0.135 | $4.05 | $49.28 |
| 16 hours | 0.8 kWh | $0.144 | $4.32 | $52.56 |
| 17 hours | 0.85 kWh | $0.153 | $4.59 | $55.85 |
| 18 hours | 0.9 kWh | $0.162 | $4.86 | $59.13 |
| 19 hours | 0.95 kWh | $0.171 | $5.13 | $62.42 |
| 20 hours | 1 kWh | $0.18 | $5.40 | $65.70 |
| 21 hours | 1.05 kWh | $0.189 | $5.67 | $68.99 |
| 22 hours | 1.1 kWh | $0.198 | $5.94 | $72.27 |
| 23 hours | 1.15 kWh | $0.207 | $6.21 | $75.56 |
| 24 hours | 1.2 kWh | $0.216 | $6.48 | $78.84 |
How we worked it out
- Energy per hour: 50 W ÷ 1,000 = 0.05 kWh
- Cost per hour: 0.05 kWh × $0.18 = $0.009
- Cost per day: × 20 hours = $0.18
- Month and year: × 30 days = $5.40, × 365 days = $65.70
Pennsylvania electricity prices
Pennsylvania pays about $0.18 per kWh, which is 3% higher than the US average of $0.175. The same electric knife sharpener would cost $5.25 a month at the national average.
What it costs in different places
Same 50-watt electric knife sharpener, 20 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $5.25 |
| California | $0.32 | $9.60 |
| Texas | $0.155 | $4.65 |
| New York | $0.25 | $7.50 |
| Florida | $0.155 | $4.65 |
| Illinois | $0.17 | $5.10 |
| Pennsylvania | $0.18 | $5.40 |
| Ohio | $0.17 | $5.10 |
| Washington | $0.115 | $3.45 |
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 Pennsylvania. 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.