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This savings calculator is to compare a standard product with it's energy saving, equivelant, so find out how much you will save each year with the energy efficient alternative.
It can be hard to work this out manually, becasue the energy efficent version of a product is usually more expensive to buy in the first place, but then uses much less power duing use.
To calculate how much it costs to run your products, we need to know how much time you use them for, and how much your eletricity costs.
| Price of your electricity per kilowatt hour (pence) | You should be able to find the price per kwh on your electricity bills. It's is sometimes complicated with some electricity tarrifs that have a changing rate depending on how much you use. We've started with 12p per kwh as this is a good average price for the UK |
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| Average use of this product per day (hours) | A light in a main living room, or kitchen in the UK, is used for an average of 5 hours per day throughout the year. Bathrooms, bedrooms etc. use lighting less than this. | ||||
| Standard product | Energy efficient version | ||
| Purchase price (pounds) | This is the amount that you pay to buy the product | ||
| Expected product life (hours) | How long do you expect the product to last? A 'normal' light bulb will last for 1000 hours. a 'long life' normal light bulb will usually be rated for 2000 hours. 'normal' spot light bulbs will usually have a life of between 2000 and 5000 hours. The expected product life is usally printed on the packaging. |
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| Product wattage | The wattage of the product. This is usually found either on the packaging, or printed directly onto the bulb. |
| Standard product | Energy efficient version | ||
| Replacement period | How often you expect to replace this product | ||
| Quantity required each year | How many you will require each year | ||
| Anual purchase price | £ | £ | The cost of a years supply of this product |
| Annual electricity cost | £ | £ | The amount it costs in electricity to run this product for a year |
| Total cost per year (including purchase price and electricity usage) |
£ | £ | Total ownership cost over a year, including purchase and running costs |
| Total savings each year with the energy efficient version |
£ | ||
This figure for total savngs takes into account the amount that you have spend to purchase the each product and the costs of electricity to run them. If this figure is greater than 0 then you would be better off buying the energy efficient product, even if it's significantly more expensive in the first place.