How Much Electricity Does A Router Modem Combo Use?
A router modem combo typically uses about 15 watts while running. At 24 hours a day that is 0.36 kWh per day, 10.8 kWh per month and 131 kWh per year.
Calculate your own cost
- Per hour
- $0.0030.02 kWh
- Per day
- $0.0630.36 kWh
- Per week
- $0.4412.52 kWh
- Per month (30 days)
- $1.8910.8 kWh
- Per year
- $23.00131 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 15-watt router modem combo cost per hour?
At $0.175/kWh, it costs $0.003 per hour. The maths: 15 W ÷ 1,000 = 0.02 kWh per hour, × $0.175 = $0.003.
How much does it cost per month?
Used 24 hours a day for 30 days, it costs about $1.89 per month and uses 10.8 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
0.36 kWh per day, 10.8 kWh per month and 131 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?
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 $1.08 and at 30¢ it is $3.24. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.02 kWh | $0.003 | $0.079 | $0.958 |
| 2 hours | 0.03 kWh | $0.005 | $0.158 | $1.92 |
| 3 hours | 0.05 kWh | $0.008 | $0.236 | $2.87 |
| 4 hours | 0.06 kWh | $0.011 | $0.315 | $3.83 |
| 5 hours | 0.08 kWh | $0.013 | $0.394 | $4.79 |
| 6 hours | 0.09 kWh | $0.016 | $0.473 | $5.75 |
| 7 hours | 0.11 kWh | $0.018 | $0.551 | $6.71 |
| 8 hours | 0.12 kWh | $0.021 | $0.63 | $7.67 |
| 9 hours | 0.14 kWh | $0.024 | $0.709 | $8.62 |
| 10 hours | 0.15 kWh | $0.026 | $0.788 | $9.58 |
| 11 hours | 0.17 kWh | $0.029 | $0.866 | $10.54 |
| 12 hours | 0.18 kWh | $0.032 | $0.945 | $11.50 |
| 13 hours | 0.2 kWh | $0.034 | $1.02 | $12.46 |
| 14 hours | 0.21 kWh | $0.037 | $1.10 | $13.41 |
| 15 hours | 0.23 kWh | $0.039 | $1.18 | $14.37 |
| 16 hours | 0.24 kWh | $0.042 | $1.26 | $15.33 |
| 17 hours | 0.26 kWh | $0.045 | $1.34 | $16.29 |
| 18 hours | 0.27 kWh | $0.047 | $1.42 | $17.25 |
| 19 hours | 0.29 kWh | $0.05 | $1.50 | $18.20 |
| 20 hours | 0.3 kWh | $0.053 | $1.58 | $19.16 |
| 21 hours | 0.32 kWh | $0.055 | $1.65 | $20.12 |
| 22 hours | 0.33 kWh | $0.058 | $1.73 | $21.08 |
| 23 hours | 0.35 kWh | $0.06 | $1.81 | $22.04 |
| 24 hours | 0.36 kWh | $0.063 | $1.89 | $23.00 |
How we worked it out
- Energy per hour: 15 W ÷ 1,000 = 0.02 kWh
- Cost per hour: 0.02 kWh × $0.175 = $0.003
- Cost per day: × 24 hours = $0.063
- Month and year: × 30 days = $1.89, × 365 days = $23.00
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. 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.