Standby mode can use much less electricity than active use, but the device may still draw power for hours at a time. The useful question is how to turn a small watt reading into an annual energy estimate, a realistic cost and a sensible decision about what to switch off.
Last reviewed: August 23, 2026. Product power modes, specifications and electricity prices vary, so use the calculations below with your own tariff and, where possible, a real measurement.
The exact amount depends on the device and the standby state. A device that continuously draws 1 watt uses about 8.76 kWh over a 365-day year. A 5-watt load uses about 43.8 kWh. Multiply the annual kWh by your electricity price per kWh to estimate the cost. One low-power device may have a small effect, but several devices connected day and night can add up.
Watts are the starting point
Watts show the rate of power use at a moment. They do not directly show what you will pay over a year.
Time makes the difference
A small standby load can run for thousands of hours because the device remains plugged in day and night.
Real readings vary
Network activity, updates, clocks, remote receivers and automatic sleep modes can change the result.
Convenience has value
Standby may support remote control, quick start or a network connection. Saving energy is not the only consideration.
How much electricity does standby mode use?
There is no single standby number for every product. A device may use a different amount in sleep mode, standby mode, networked standby and the lowest off mode. Some products also wake briefly for updates, network checks or scheduled tasks.
For the basic meaning of standby power, see What Is Standby Power? That article explains why a product can look switched off while still using electricity. This article focuses on measuring the load, estimating the yearly effect and deciding what to do about it.
As a simple reference, a continuous 1-watt load uses about 8.76 kWh per year. A continuous 2-watt load uses 17.52 kWh. A continuous 5-watt load uses 43.8 kWh. These are calculations, not promises about a particular television, console, router or charger.
How do you calculate standby energy use?
Start with the standby power in watts, estimate how long the device stays in that state, then convert watt-hours into kilowatt-hours. Electricity bills normally use kilowatt-hours, written as kWh.
Annual energy (kWh) = standby power (W) x hours connected ÷ 1,000Annual cost = annual energy (kWh) x your electricity price per kWh
If the device stays in the same state continuously for a 365-day year, use 8,760 hours. For example:
The example uses a round tariff only to show the method. Electricity prices vary by location, plan, time of use and other charges. Enter the price shown on your own bill or retailer plan rather than treating 0.30 as a universal rate.
How much does 1 watt of standby power cost?
One watt of continuous standby power uses 8.76 kWh per year under the simple 365-day estimate. To translate that into money, multiply 8.76 by your own price per kWh. The table below shows how the energy changes as the standby reading increases.
| Continuous standby draw | Approximate annual energy | Cost using your rate R |
|---|---|---|
| 0.5 W | 4.38 kWh | 4.38 x R |
| 1 W | 8.76 kWh | 8.76 x R |
| 2 W | 17.52 kWh | 17.52 x R |
| 5 W | 43.80 kWh | 43.80 x R |
| 10 W | 87.60 kWh | 87.60 x R |
Here, R means your electricity price per kWh. If a group of devices draws 10 watts together, use the 10-watt row for a quick first estimate. A measurement of the whole power strip can be more useful than guessing each device separately.
Which devices can use the most standby power?
Do not assume that a product category has one standard standby number. Two similar products can behave differently because of their age, power supply, network features, display, updates and default settings. The following groups are good places to investigate, not fixed rankings.
Networked electronics
Smart televisions, streaming boxes, game consoles, printers, speakers and cameras may remain connected so an app, remote or online service can reach them.
Devices with displays
Microwaves, ovens, audio equipment and other products may keep a clock, indicator or control circuit active even when their main function is off.
Quick-start products
Some computers, monitors, consoles and entertainment systems keep part of the system ready so they can wake or start more quickly.
Older power supplies
Older electronics and external adapters can be worth checking, especially when they stay connected in a spare room or equipment cupboard.
Routers and mesh systems are a special case. They may use electricity continuously, but that does not make the energy automatically wasteful if you need the network. The right question is whether the connection is useful and whether a lower-power setting or schedule can meet the same need.
How can you measure standby power at home?
A product specification can provide a starting point, but a plug-in electricity meter lets you see what your particular device does in your home. The U.S. Department of Energy’s standby power measurement guidance points to IEC 62301 as a method for measuring low-power modes. A household meter will not reproduce a laboratory test, but it can answer practical questions about your own equipment.
Very small loads can be difficult for inexpensive meters to display accurately. A meter may round a small reading down to zero or show a changing value. For a low or intermittent load, measure a whole device group for 24 hours or longer and treat the result as an estimate.
Why does the reading change over time?
Standby is not always one fixed electrical state. A device can move between several low-power behaviours depending on what it is doing and what it expects next.
| Possible state | What may happen | Why the reading can change |
|---|---|---|
| Display off | The screen or indicator is dark, but the receiver remains ready. | Remote-control or wake circuits may stay active. |
| Sleep | The main processor reduces activity and waits for a signal. | The device may wake briefly for maintenance or input checks. |
| Networked standby | The device keeps a network connection available. | Traffic, updates and connection checks may create short increases. |
| Off or disconnected | The device reaches a lower-power state or is physically separated from the outlet. | Timers, remote control and network features may no longer work. |
When comparing products, check the exact mode behind a published number. A figure labelled sleep may not be comparable with a figure labelled networked standby. The same product may also use different amounts before and after a firmware update or a change in settings.
Should you turn devices off at the wall?
Sometimes. The best candidates are devices that are unused for long periods, have a measurable standby load and do not need remote access, scheduled operation or a network connection. A group switch or power strip can make this easier for an entertainment centre or desk setup.
| Often worth considering | Often better left connected |
|---|---|
| Spare monitors, printers and speakers that sit unused. | Routers, mesh nodes and network equipment needed for daily access. |
| Entertainment equipment in a guest room or rarely used room. | Security, medical or safety equipment that must remain available. |
| Older chargers, adapters or devices with a clear measurable load. | Fridges, freezers and appliances that need temperature control. |
| A whole desk or entertainment cluster that can be switched safely together. | Products that need timers, remote commands, updates or scheduled tasks. |
Do not switch off a device just because it has a standby state. If doing so breaks a feature you use, creates a reset problem or makes the product harder to live with, the theoretical saving may not be worth it. Measure first when the decision is unclear.
How does standby power affect ownership cost?
Standby electricity is one part of a product’s operating cost. Active use, heating, cooling, charging, maintenance and replacement parts may matter more for some products. For others, a low but continuous load can become relevant because the product stays connected for years.
Use What Does Energy Efficiency Actually Mean? to separate a product’s energy metric from its overall fit. Then use What Is Total Cost of Ownership? and How to Calculate the Real Cost of Owning a Product to include purchase price, operating cost, repairs, subscriptions and the period you expect to own the product.
Comparison tools can help, but treat their numbers as estimates under stated conditions. For example, the EECA efficient appliance calculator explains that product information comes from manufacturers or importers and is intended as a guide for comparing regulated products. Your actual cost still depends on the specific product, settings, usage pattern and electricity rate.
The bottom line
Standby mode can use anywhere from a very small amount to a meaningful continuous load, depending on the product and the mode. A 1-watt device uses about 8.76 kWh per year if it stays in that state continuously. A 5-watt load uses about 43.8 kWh. Apply your own electricity rate to estimate the money.
The most useful method is simple: measure a device or group, record the real reading over enough time, convert it to annual kWh, multiply by your tariff and decide whether the saving is worth the lost convenience. Keep features you need and reduce the loads that are easy to remove.
Do not chase every watt. Find the continuous loads that matter in your home, then switch off only what you do not need.
Frequently asked questions
How much electricity does 1 watt use in a year?
A continuous 1-watt load uses about 8.76 kWh over a 365-day year. Multiply 8.76 by your electricity price per kWh to estimate the annual cost.
How much does standby mode cost per year?
It depends on the standby wattage, how long the device remains connected and your electricity rate. Use annual cost = standby watts x hours connected ÷ 1,000 x price per kWh.
Does a television use electricity when it is turned off?
Many televisions use a small amount when they appear to be off because they are waiting for a remote signal, network command or quick-start action. The amount varies, so check the specification or measure the television with a plug-in meter.
Do chargers use power when they are plugged in without a device?
Some chargers and power adapters draw a small no-load amount, while others use very little. The result depends on the design and age of the charger. If many adapters stay connected, measure the group rather than assuming they are all identical.
Which household devices use the most standby power?
Older electronics, networked devices, products with displays, quick-start systems and external power supplies are useful places to check. There is no universal ranking, so measure the products in your own home.
Is standby power always wasted electricity?
No. Standby can support remote control, network access, timers, updates, safety functions or quick start. It becomes a stronger saving opportunity when the feature is not needed and the load is continuous.
Should I switch off my router at the wall?
Only if you do not need the connection during that period and the interruption will not affect security, phone service or other devices. A router may use electricity continuously, but that can be a useful cost when the network is needed.
Does a smart plug eliminate standby power?
A smart plug can disconnect the appliance, but the smart plug itself may use a small amount to remain connected. It can still be useful for a group of devices or a schedule, especially when the combined saving is larger than the plug’s own consumption.
What is the safest way to measure standby power?
Use a suitable external plug-in electricity meter, follow its load rating and leave the product closed. Do not open the appliance or touch internal wiring. Measure a stable state or record energy over a longer period if the reading changes.