How many watts do my appliances use?

How Much Energy Do My Appliances Use? INFOGRAPHIC

Energy is an inescapable expense for all businesses. But have you ever wondered how much each appliance is costing you? Saving electricity (and money) is always easier when you know how much you’re actually using. Although your appliances’ actual energy use depends on make and model (along with other factors like temperature conditions and the age of the appliance), these figures will give you an idea of how much it costs to run the appliances in your office.

How many watts do common appliances use?

Immersion heater3000W
Oil-filled radiator1500-2500W
Vacuum cleaner500-1200W
Extractor fan5-36W
Desktop computer80-150W
Tablet (charge)10W
Broadband router7-10W
Smartphone (charge)2.5-5W

What is a watt? 

How to calculate the amount of energy used by each appliance

Power rating in kW x hours used per day = kWh

How to calculate the energy cost of each appliance

kWh per day x unit cost = electricity cost per day

For example…

Take a 150-watt fridge and an energy unit cost of 12.5 p/kWh. The fridge runs 24 hours per day.

150W = 0.15kW

0.15 kW x 24 hours = 3.6 kWh
3.6 kWh x 12.5p = 45p per day

How Much Energy Do My Business Appliances Use?

Common appliances and their typical power ratings and cost (based on an average unit cost of 12.5p/kWh.)

How much energy does a server use?

1000 watts = 1kWh, on for 24 hours per day = £3 per day = £1095 per year

How much electricity does a desktop PC use?

100 watts = 0.1 kWh, on for 8 hours per day = 10p per day

How much electricity does a laptop use?

50 watts = 0.05 kWh, on for 8 hours per day = 5p per day

How much does it cost to use a microwave oven?

1 kWh per use = 12.5p for every ready meal

How much electricity does it take to boil a kettle?

0.11 kWh to heat 1 litre of water = 1.4p for 4 cuppas

How much electricity does a large screen TV use?

170 watts = 0.17 kWh, on for 8 hours a day = 17p a day

How much does it cost to run an air conditioner?

4000 watts = 4kWh, on for 8 hours a day =£4 per day

How much electricity does a lightbulb use?

60 watt = 0.06kWh, on for 8 hours per day = 6p per day

Which appliances use more electricity?

As a general rule, appliances which produce heat or have moving parts use more electricity than those that produce sound or light.

What is a power rating?

Every electrical appliance has a power rating which tells you the amount of electricity it needs to work. The power rating is generally given in watts (W) or kilowatts (kW). There are 1000 watts in one kilowatt. The amount of electricity each appliance uses is measured in time – kilowatt hours (kWh). UK energy suppliers measure energy consumption by kWh and charge a unit cost per kWh.

How many watts do my appliances use?

See the infographic below to find out…

Download this infographic here.

How much energy do my appliances use?

Tips to save on electricity

    • Turn off appliances completely when not in use – don’t leave them in standby mode.
    • Only boil the amount of water you need in the kettle.
    • Switch to low energy light bulbs.
    • If you’re buying a new appliance, look for one with an ‘A’ rating for energy efficiency
    • Switch energy suppliers to avoid paying more than you need to.
  • Switch from desktops to laptops.