A Swedish inventor has developed a watch that calculates its wearers' life expectancy and then counts down to their death, says a report by The Mirror.

Dubbed "the death watch," Tikker was invented by Frerik Cotling, who, quelling notions of morbidity, said the product is about "making every second count."

Upon purchasing the wristwatch, users fill out an online questionnaire that asks for information about their lifestyle. Details like medical history, whether they smoke or drink, or if there are any medical conditions in the family, like cancer, diabetes and heart problems.

Users will then add information on how much exercise they do and their weight. After obtaining these, Tikker will yield a score, which will be deducted from their age.

Tikker, which doubles as a regular watch, will then give a death rate and start counting down.

"Imagine someone told you that you had only one year left to live. How would that change your life? For all of us, life comes with a best-before date. While death is none-negotiable, life isn't," Tikker's homepage says.

Colling said that rather than call it "the death watch," he refers to it as "the happiness watch," according to MailOnline.

"All we have to do is learn how to cherish the time and the life that we have been given; seize the day and follow your hearts," the website says.

The watch counts down the seconds and shows years, months and days on the top row, and displays hours, minutes and seconds on the second row. The bottom row shows the local time.

After earning $98,665 from a Kickstarter campaign - the target was $25,000 -- Tikker can now be bought online on Firebox for $79.99.

A buyer commented: "We all know that time waits for no man. 'The death watch' lets you know down to the last second exactly how not to waste it by simply completing a questionnaire based on your general health and lifestyle," as quoted by MailOnline.