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If you're worried about what your lifestyle may be doing to your health, then a new - albeit very morbid gadget - gadget claims to help.

A Swedish inventor has designed a watch that apparently calculates a person's life expectancy - and even counts down to the time they will die, the Daily Mail reports.

Dubbed the 'death watch', Tikker was created by Fredrik Colting.

But far from being morbid, Mr Colting calls it 'The Happiness Watch' and claims it has been designed to help people make the most of their life and cherish the time they have left.

To set up Tikker, the wearer fills out a questionnaire by entering information about their medical history, including allergies or illnesses.

They are also asked whether they drink or smoke and if there are any instances of cancer, diabetes and other diseases in their family.

Wearers are additionally asked about how much exercise they do, as well as how much they weigh before receiving a score.

Their age is deducted from the results to predict a death date and the Tikker - which also works as a regular watch - begins the countdown.

The top row of the watch's digital display shows years, months and days, while the second row counts down hours, minutes and seconds.

The bottom row shows the local time.

'From years to seconds it presents time ever moving, never standing still, and our lives dwindling towards the final rest,' said Cotling.

'The occurrence of death is no surprise to anyone, but in our modern society we rarely talk about it.

'I think that if we were more aware of our own expiration I'm sure we'd make better choices while we are alive.'