# - Electricity consumption calculators -Increase your home efficiency, reduce your carbon footprint and save money

The first step towards reducing our electricity consumption is to increase our knowledge and awareness.

For that, there is not better way than calculating how much electricity we are using and how much money our electricity consumption is costing us.

Before going ahead, we really recommend to first have a look to the Effiworkx YouTube channel videos. On those videos we explain concepts that will be of your interest.

## 1 - Convert Watts to Kilowatt Hours

This calculator can be used to:

kW = W/1000

### – Convert Watts (W) to Kilowatt Hours (kWh)

kWh = (W/1000) x Hours

kWh is the measurement unit used by the electricity suppliers to calculate our electricity bills.

Also, most of the big appliances, like the dishwashers or washing machines, rate their consumption in kWh.

## 2 - Power calculator

This calculator can be used to:

P = V x I

## 3 - Voltage calculator

This calculator can be used to:

V = P/ I

## 4 - Current calculator

This calculator can be used to:

I = P / V

## 5 - Device or appliance electricity consumption and cost calculator

This calculator can be used to:

### – Calculate the electricity consumption and electricity cost of a device

If you know the power ratings of a device, it is quite straight forward to calculate the electricity consumption. In order to calculate the electricity cost, you must know first how much you are paying per kWh.

### – Calculate the electricity consumption and electricity cost of an appliance

We don’t recommend to use calculators to find out the electricity consumption of appliances like a washing machine, a tumble dryer or a dishwasher. The power consumption of those appliances may vary depending on the cycle settings so we recommend to use a plug in power meter which is a device which will provide much more accurate results.

## 6 - Bulb power consumption calculator

This calculator can be used to:

### – Calculate the savings from replacing incandescent for CFL or LED bulbs

This bulb wattage comparison table can be used as reference for the ‘Bulb power rating’ field. For example, if you have a 100 W incandescent bulb and you want to know how much you would be saving by replacing it by a LED bulb. First make the calculations using a ‘Bulb power rating =100’, take note of the results and afterwards make the calculations using  ‘Bulb power rating =20’

IncandescentCFLLED
40 W8-12 W4-5 W
60 W13-18 W6-8 W
75 W18-22 W9-13 W
100 W23-30 W16-20 W

## 7 - Standby power consumption calculator

This calculator can be used to:

### – Calculate a device power consumption while in standby mode.

E.g. desktop printer, computer monitor, phone charger,…

Note that a device power consumption in standby mode it is most probably much lower than during normal operation. Therefore, in order to calculate the standby mode power consumption of a device over time, it is necessary to find out the instantaneous power consumption while in standby mode.

## 8 - Electricity consumption reduction (%) savings

This calculator can be used to:

### – Calculate how much electricity and money can be saved if we reduce the heating  consumption by X%.

As an example, tumble dryer balls claim to reduce the drying time by 20%. That means potential savings of 20% on the tumble dryer cycle cost of 20%.

A 20% electricity consumption per cycle may not translate in big saving over short periods of time but it may represent significant saving over a longer period.

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## Effiworkx blog

For more useful energy and water saving information and advice, have a look to our blog.

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