Cost to Run a 25-watt router modem combo for 4 hours in Washington
Running a 25-watt router modem combo for 4 hours uses 0.1 kWh and costs $0.012 at $0.115/kWh in Washington. Do that every day and it adds up to $0.345 a month.
Calculate your own cost
- Per hour
- $0.0030.03 kWh
- Per day
- $0.0120.1 kWh
- Per week
- $0.0810.7 kWh
- Per month (30 days)
- $0.3453 kWh
- Per year
- $4.2036.5 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 25-watt router modem combo cost per hour?
At $0.115/kWh, it costs $0.003 per hour. The maths: 25 W ÷ 1,000 = 0.03 kWh per hour, × $0.115 = $0.003.
How much does it cost per month?
Used 4 hours a day for 30 days, it costs about $0.345 per month and uses 3 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
0.1 kWh per day, 3 kWh per month and 36.5 kWh per year at 4 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 the provider’s rated power as a guide and avoid frequent unnecessary restarts. 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 $0.30 and at 30¢ it is $0.90. 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 | 0.03 kWh | $0.003 | $0.086 | $1.05 |
| 2 hours | 0.05 kWh | $0.006 | $0.173 | $2.10 |
| 3 hours | 0.08 kWh | $0.009 | $0.259 | $3.15 |
| 4 hours | 0.1 kWh | $0.012 | $0.345 | $4.20 |
| 5 hours | 0.13 kWh | $0.014 | $0.431 | $5.25 |
| 6 hours | 0.15 kWh | $0.017 | $0.518 | $6.30 |
| 7 hours | 0.18 kWh | $0.02 | $0.604 | $7.35 |
| 8 hours | 0.2 kWh | $0.023 | $0.69 | $8.40 |
| 9 hours | 0.23 kWh | $0.026 | $0.776 | $9.44 |
| 10 hours | 0.25 kWh | $0.029 | $0.863 | $10.49 |
| 11 hours | 0.28 kWh | $0.032 | $0.949 | $11.54 |
| 12 hours | 0.3 kWh | $0.035 | $1.04 | $12.59 |
| 13 hours | 0.33 kWh | $0.037 | $1.12 | $13.64 |
| 14 hours | 0.35 kWh | $0.04 | $1.21 | $14.69 |
| 15 hours | 0.38 kWh | $0.043 | $1.29 | $15.74 |
| 16 hours | 0.4 kWh | $0.046 | $1.38 | $16.79 |
| 17 hours | 0.43 kWh | $0.049 | $1.47 | $17.84 |
| 18 hours | 0.45 kWh | $0.052 | $1.55 | $18.89 |
| 19 hours | 0.48 kWh | $0.055 | $1.64 | $19.94 |
| 20 hours | 0.5 kWh | $0.058 | $1.73 | $20.99 |
| 21 hours | 0.53 kWh | $0.06 | $1.81 | $22.04 |
| 22 hours | 0.55 kWh | $0.063 | $1.90 | $23.09 |
| 23 hours | 0.58 kWh | $0.066 | $1.98 | $24.14 |
| 24 hours | 0.6 kWh | $0.069 | $2.07 | $25.19 |
How we worked it out
- Energy per hour: 25 W ÷ 1,000 = 0.03 kWh
- Cost per hour: 0.03 kWh × $0.115 = $0.003
- Cost per day: × 4 hours = $0.012
- Month and year: × 30 days = $0.345, × 365 days = $4.20
Washington electricity prices
Washington pays about $0.115 per kWh, which is 34% lower than the US average of $0.175. The same router modem combo would cost $0.525 a month at the national average.
What it costs in different places
Same 25-watt router modem combo, 4 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $0.525 |
| California | $0.32 | $0.96 |
| Texas | $0.155 | $0.465 |
| New York | $0.25 | $0.75 |
| Florida | $0.155 | $0.465 |
| Illinois | $0.17 | $0.51 |
| Pennsylvania | $0.18 | $0.54 |
| Ohio | $0.17 | $0.51 |
| Washington | $0.115 | $0.345 |
About router modem combo running costs
Combined modem-router units usually stay on all day. Their wattage is small, but a 24-hour schedule matters to the yearly total.
Typical sizes: 8 W, 15 W, 25 W, 35 W.
How to spend less: Use the provider’s rated power as a guide and avoid frequent unnecessary restarts.
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.