RandoziStandby Power Cost Calculator
Add your devices, their power draw and hours of use to see the energy, the cost and the CO2 per day, month and year.
Total cost per year
20.37
135.8 kWh · 54.3 kg CO2
Per day
0.06
Per month
1.70
kWh per month
11.32
| Device | kWh/yr | Cost/yr | kg CO2/yr |
|---|---|---|---|
| TV in standby | 7.3 | 1.10 | 2.9 |
| Game console (rest mode) | 58.4 | 8.76 | 23.4 |
| Wi-Fi router | 70.1 | 10.51 | 28 |
How it works
- Enter your electricity price per kWh, from your bill.
- Add each device with its power in watts, hours per day and how many you have.
- Optionally change the CO2 factor to match your electricity grid.
- Compare the devices in the table to see which ones cost the most over a year.
What people use it for
Hunting phantom load
Check what a TV, console or set-top box costs while it sits in standby.
Always-on gear
Price a router, a NAS, a fridge or an aquarium pump running all day.
Before you buy
Compare the yearly running cost of two appliances with different power ratings.
Questions
- How are energy and cost calculated?
- kWh per day = watts × hours per day × number of devices ÷ 1000. A year is 365 days and a month is a twelfth of a year. Cost = kWh × price per kWh.
- Where does the CO2 factor come from?
- CO2 = kWh × emission factor. The default of 0.4 kg per kWh is only a rounded, indicative value, not an official figure for your country. Grid factors differ a lot from one country and one year to the next, so replace it with your electricity supplier's or your national grid's factor.
- How do I find a device's standby watts?
- Check the label or manual, or measure with a plug-in energy meter. Many modern devices draw under 1 W in standby, while some set-top boxes and consoles in quick-start mode draw several watts.