A new calculator can predict when you will die, and how much of your life will be spent in robust health.

Health experts say their algorithm can predict for the first time the impact of specific steps, with a 20-minute daily jog being enough to significantly boost healthy lifespan.

The risk assessment tool means individuals can be given a range of predictions, including how long they are likely to live.

It will also say how many years of “good health” are left, based on their lifestyle and health history, and predict the three most likely diseases to blight them.

The calculator, devised by health insurers, will also advise on the best actions which can be taken to prevent illness, increasing life expectancy, as well as years left in health.

Extra decade of life

It suggests that a major overhaul of diet and exercise could bring an extra decade of healthy living, while boosting life expectancy by as much as eight years.

International research shows Britons spend an average of 12 years living in ill-health, with the decline setting in aged 69.

While life expectancy in the UK compares well to other countries, the proportion of time spent living with disabilities, chronic conditions, and other ailments has risen by almost 15 per cent since 1990.

The calculator being launched by Vitality, a health insurance scheme, and RAND Europe research institute, asks individuals to respond to a series of questions about their daily habits, existing health conditions and medication.

The model shows that even small changes can make a significant impact.