How many watts does a computer use?
A desktop computer uses between 60 and 250 watts, depending on whether it is idle. A laptop consumes 15 to 45 watts. A 22-inch LCD monitor uses an average of 25 watts, while an older 17-inch cathode ray monitor would use about 80 watts.
A typical desktop computer uses about 65 to 250 watts. To find the figure for your particular computer you can contact the manufacturer (not me), or see my section on measuring electrical use. Add another 20-40 watts for an LCD monitor, or about 80 watts if you have an old-school 17" CRT.
- When making coffee the coffee machine will use around 300 to 600 watts for 2 cups of coffee and 1000 to 1500 watts for 8-10 cups of coffee. We estimate that an average coffee maker will use 800 watts to produce 4 cups of coffee in 10 minutes.
- fridge uses 1400 kWh a year, while a modern energy-efficient model uses only 350 kWh — a whopping 75% reduction. At 15¢ kWh, trading in a pre-1986 fridge for a new efficient one would save about $158 a year in electricity costs. And some older fridges are even worse than the average.
- Most hair dryers will have a power rating label to indicate the maximum wattage, which typically ranges from 800 to 1800 watts. The energy use of a typical hair dryer first depends which mode it is using. Unheated air can use as few as 70 watts of power, but a hair dryer on high heat will use around 1500 watts.
The power consumption of a computer varies depending on whether it is a desktop or a laptop: A desktop uses an average of 200 W/hour when it is being used (loudspeakers and printer included). A computer that is on for eight hours a day uses almost 600 kWh and emits 175 kg of CO2 per year.
- An incandescent light bulb costs about 50 cents and lasts about 750 hours. If you were to leave a 100-watt bulb burning for 24 hours each day, 365 days per year, it would use 876 kilowatt hours per year. (1000 watts equals one kilowatt – “kilo” means a thousand.) A kilowatt-hour of electricity costs about 15 cents.
- Modern dishwashers are energy efficient and do not use a lot of water. Dishwashers use between 1200 and 2400 watts of power, with an average dishwasher using 1800 watts. Click calculate to find the energy consumption of a dishwasher using 1800 Watts for 1 hour a day @ $0.10 per kWh.
- An average ink-jet or laser printer which is designed for home use will typically use 30 to 50 watts when it is printing, in standby mode most printers will draw around 3 to 5 watts of power. Commercial printers which are used in an office will draw 30 to 50 watts on standby and 300 to 500 watts when printing.
A 19" TV uses about 80 watts, way less than just about any modern TV. LCD (and LCD/LED). This is the same type of screen that goes in laptop computers and modern computer monitors. Much more efficient than CRT, they use about 125, 210, and 280 watts for the 32", 42", and 52" sizes respectively.
- Within the ENERGY STAR rated LED options, power consumption varied by as much as 50-70 watts depending on the TV size and manufacturer. After reviewing the energy consumption cost of a few models, I finally chose a 42-inch LED TV that uses 79 watts.
- The average "active mode" power use of LCD flat-screen TVs in the 35-inch to 54-inch category was about 250 watts during the years 2005 to 2007, but is now closer to 100 watts, according to the study.
- This can only be calculated if you know what the wattage of your network router is. Yours could consume anything from 2 to 20 watts, although the average is around 6. Taking a standard rate of 21.63 cents per kilowatt hour, you can therefore expect your Wi-Fi router to cost around $0.0311 per day to operate.
Updated: 26th October 2019